Graupner mx20 User guide

Download

mx-20

33124.mx-20 HoTT.1.en

HOPPING.TELEMETRY.TRANSMISSION

Programming Manual

Table of contents

General notices

Table of contents ...........................................................2

Environmental protection notices ..................................3

Safety notices ................................................................ 4

Safety notices and handling regulations

for nickel-metal-hydride rechargeable batteries ............. 8

Foreword ......................................................................10

Remote control set description .................................... 11

Recommended chargers .............................................13

Transmitter power supply ............................................. 14

Receiver power supply .......................................... 16

Joystick length adjustment...........................................17

Opening the transmitter housing .................................17

Changing joystick behavior ..........................................18

Transmitter description ................................................20

Operating elements ............................................... 20

Backside of the transmitter .................................... 21

Headset connector ................................................21

Mini-USB connector ..............................................21

Data jack ...............................................................21

DSC (Direct Servo Control) ................................... 22

Data storage / card slot .........................................22

Display and keypad ............................................... 24

Operating the "data terminal" ................................25

Shortcuts ............................................................... 26

Hidden menu columns ...........................................27

Hidden mode ......................................................... 28

Language selection and display contrast ..............28

Joystick calibration ................................................29

Telemetry data display ........................................... 32

Displayed warnings ...............................................36

Function ﬁ eld displays ........................................... 37

Position display for rotary controls, CTRL 7 & 8 .... 37

Entry lockout ..........................................................37

Table of contents

Transmitter initialization ...............................................38

Firmware update ...................................................39

Receiver initialization ................................................... 42

Firmware update ...................................................43

Installation notices ....................................................... 46

Receiver system power supply ..............................47

Term deﬁ nitions ...........................................................50

Switch and control assignments .................................. 52

Digital trimming ............................................................ 54

Winged models ............................................................ 56

Receiver layout ......................................................57

Helicopter models ........................................................ 58

Receiver layout ......................................................59

Program descriptions

Loading a new memory location .................................. 60

"Model select" ............................................................ 63

"Copy / Erase" ............................................................ 64

Erase model ..........................................................64

Copy model  model ........................................... 64

Export to SD card .................................................. 65

Import from SD card .............................................. 66

Copy ﬂ ight phase ................................................... 66

"Suppress menus" ..................................................... 67

"Suppress models" .................................................... 67

"Base setup model"

Winged model .......................................................68

Model name ....................................................68

Stick mode ......................................................68

Bound receiver ................................................ 68

Binding receivers ............................................69

Receiver output ............................................... 70

RF transmit ......................................................71

Range test ....................................................... 71

DSC output...................................................... 72

Cut-off ............................................................. 72

Helicopter model ...................................................74

Model name ....................................................74

Stick mode ......................................................74

Bound receiver ................................................ 74

Binding receivers ............................................75

Receiver output ............................................... 76

RF transmit ......................................................77

Range test ....................................................... 77

DSC output...................................................... 78

Autorotation ..................................................... 78

Auto.C1 Pos. ....................................................79

Cut-off ............................................................. 79

Model type" ............................................................... 82

"Helicopter type" ........................................................ 86

"Servo adjustment" .................................................... 90

"Stick mode"

Winged model .......................................................92

Helicopter model ...................................................94

"Control adjust"

Winged model .......................................................96

Helicopter model .................................................100

Throttle limit function ......................................104

Idle setting ...................................................... 105

Throttle limit in combination with AR in the

"Stick mode" menu ...................................... 107

"Dual Rate / Expo"

Winged model .....................................................108

Helicopter model .................................................112

"Channel 1 curve"

Winged model .....................................................116

Helicopter model .................................................119

"Switch display" ....................................................... 122

"Control switch" ....................................................... 123

How do I program a ﬂ ight phase? .............................. 126

"Phase settings"

Winged model .....................................................128

Helicopter model .................................................132

Phase assignment" ................................................ 134

"Phase trim" (winged model) ....................................136

"Non-delayed channels" .......................................... 137

"Timers (general)" .................................................... 138

"Flight phase timers" ............................................... 142

What is a mixer? ........................................................ 145

"Wing mixers" ...........................................................146

"Helicopter mixer" .................................................... 164

Adjusting the throttle and pitch curve ..................175

Autorotation setting .............................................178

General remarks about freely progr. Mixers ..............180

"Free mixers" ............................................................ 181

Linear mixers ...................................... beginning 185

Curve mixer ........................................ beginning 187

Examples............................................................. 190

"MIX active/phase" ................................................... 192

"Mix Only Channel" .................................................. 193

"Dual mixer" ..............................................................194

"Swashplate mixer" ..................................................196

"Fail-safe" .................................................................196

"Teacher / pupil" .......................................................198

Connection schematic ......................................... 201

Wireless HoTT system ........................................202

"Tx. output swap" ..................................................... 206

"Telemetry" ...............................................................208

Setting& Data View .............................................. 209

Satellite operation of two receivers ..............218

Sensor Select ...................................................... 220

RF Status View ....................................................221

Voice Trigger ........................................................222

"Basic Settings" ....................................................... 224

"Servo display" ......................................................... 230

"Servo test" ...............................................................231

Code lock" ............................................................... 232

"Info display" ...........................................................234

Programming examples

Introduction ................................................................ 236

Winged model

First steps ............................................................ 238

Incorporating an electric drive .............................244

C1 joystick switchover between

electric motor and butterﬂ y ............................247

electric motor and airbrake ............................250

Timer activation by control or switch ...................252

Parallel operating servos ..................................... 254

Using ﬂ ight phases

Example 1 .....................................................256

Example 2 .....................................................260

Control of temporal processes ............................266

Eight-ﬂ ap wing ..................................................... 268

Delta and ﬂ ying wing models ............................... 272

F3A model ........................................................... 276

Helicopter model ........................................................280

Appendix

Appendix .................................................................... 290

FCC Information ........................................................293

Declaration of Conformity .......................................... 294

Warranty Certiﬁ cate ...................................................295

Environmental protection notices

The symbol on this product, its operating instructions or packaging gives notice that this product may not be discarded as common household waste at the end of its service life. It must be turned over to a recycling collection point for electric and electronic apparatus.

The materials can be recycled according to their markings. You make an important contribution to protection of the environment by utilizing facilities for reuse, material recycling or other means of exploiting obsolete equipment.

Batteries must be removed from the unit and disposed

of separately at an appropriate collection point.

Please inquire with local authorities about the responsible waste collection locations.

This manual serves only as a source of information and can be changed without prior notiﬁ cation. Graupner accepts no responsibility or liability for errors or inaccuracies which may be contained in the information section of this manual.

Table of contents

Safety notices

Be sure to pay attention!

In order to enjoy your modeling hobby for a long time, please read these instructions thoroughly and give particular attention to the safety notices. You should also register yourself at https://www.graupner.de/de/ service/produktregistrierung.aspx right away in order to automatically receive current information per email about your product.

If you are a beginner with remote controlled model aircraft, ships or cars, you should really ask an experienced model pilot for assistance.

If this remote control system changes ownership, these instructions should surely be included with remote control system.

Intended usage

This remote control system may only be used for the purpose intended by the manufacturer - speciﬁ cally - for the operation of unmanned remote controlled models. Any other usage is not permissible.

Safety notices

SAFETY IS NO ACCIDENT

and

REMOTE CONTROLLED MODELS ARE NOT

TOYS

… because even small models can cause substantial property damage and/or personal injuries if they are not handled properly - even if caused by third parties.

Technical defects of an electrical or mechanical nature can lead to unexpected startup of a motor and/or parts being hurled through the air to pose a danger of injury to you and to others.

Short circuit conditions are to be avoided absolutely! A short circuit condition may not only destroy parts of the remote control system but, depending on

Safety notices

the circumstances and the battery energy involved, may also pose acute danger of incineration or even explosion.

All motor-driven parts, such as aircraft or ship propellers, helicopter rotors, open gearboxes etc. represent a constant danger. Contact with these parts must be avoided. A rapidly turning aircraft propeller can, for example, sever a ﬁ nger. Also pay attention that other objects do not come into contact with driven parts.

When a drive battery is connected or a motor is running: never get into the danger zone of driving mechanisms.

Be sure to pay attention that motors do not start up unintentionally while performing programming operations. Disconnect the fuel supply or battery terminals to motors before programming.

Protect all units from dust, dirt, moisture and other foreign parts. Never expose these units to vibrations or excessive hot or cold temperatures. Remote control operation may only be performed under "normal" outdoor temperatures, i. e. within a range of -15 ° C to +55 ° C.

Avoid mechanical jarring and pressure stresses. Always check units for damage to housings and cables. Do not use units which have been damaged or become wet, even after they are dry again.

Only those components and accessories which we recommend may be used. Always use original Graupner plug and jack connectors which are made for one another out of the same materials.

When routing cables, pay attention that they are not stressed, unduly kinked or broken. The sharp edges of adjacent parts also represent a hazard for insulated conductors.

Be sure that all plug and jack connections are ﬁ rmly

seated. Do not pull on the cable to disconnect a plugged connector.

No modiﬁ cations whatsoever may be made to units. Modiﬁ cations will void the operating permit and all insurance protection.

Receiver installation

The receiver is to be installed with a cushion of foam rubber to afford protection against jarring; in aircraft models behind a strong rib, for a car or ship model the location must be protected against dust and spray water.

The receiver may not be mounted in direct contact with the hull or chassis as this would allow motor vibrations and/or roadway jarring to be transferred directly to the receiver. When a receiver system is installed in a model with a combustion motor, all receiver parts should always be protected against the intrusion of exhaust gasses and oil residue. Above all, this applies to the model's ON/OFF switch, which is typically built into the model's outer surface.

Position the receiver such that connecting cables to the servos and the power supply are routed with a bit of slack and that the receiver's antenna is at least 5 cm away from any large metal parts or wiring except for other receiver wires/cables. In addition to steel, this also includes carbon ﬁ ber parts, servos, electric motors, fuel pumps and all sorts of cables, etc.

Preferably, the receiver should be mounted in a readily accessible location in the model that is well apart from all electrically operated units. Under no circumstances may a servo cable be wrapped around the antenna or routed close to it.

Make sure that cables near the antenna cannot move about during ﬂ ight.

Routing the receiver's antenna

The receiver and its antennas must be positioned as far away as possible from drives of any kind. If the model's hull is made of carbon ﬁ ber material, the ends of the antennas must extend outside of the hull.

The orientation of antennas is not critical. Nevertheless, a vertical (upright) installation of receiver antennas is advantageous. In the case of diversity antennas (two antennas), the second antenna should be oriented at a 90° angle to the ﬁ rst antenna.

Servo installation

Always mount servos with the provided rubber vibrationdamper parts. Only in this manner can these parts be protected against excessively hard vibrations.

Installing control rods

Control rods must be installed such that they operate freely and smoothly. It is particularly important that all rudder levers are able to move to their full limits, i.e. not otherwise mechanically blocked.

In order to be able to stop a running motor at any time, control rods must be adjusted such that the carburetor tap is completely closed when the joystick and trim lever are brought into their end idle position.

Pay attention that no metal parts, e. g. as a result of rudder actuation, vibration, rotating parts, etc., rub against one another. Metal-to-metal contact causes electrical "noise" which can interfere with the correct operation of the receiver.

Transmitter antenna orientation

Transmission ﬁ eld strength is minimal in an imaginary line extending straight out from the end of the transmitter's antenna. This means that "pointing" the

transmitter's antenna directly toward the model will not produce good reception but rather degrade reception.

When multiple remote controls are operating simultaneously, pilots should position themselves in a loose group. Pilots standing off to themselves not only endanger their own models but those of others as well.

However, when 2 or more pilots using 2.4 GHz remote control systems are closer than 5 m to one another this can lead to return channel overdrive which, in turn, will trigger a range warning much too early. Increase your distance between one another until the range warning ceases.

Pre-start checks Before switching the receiver on, ensure that the gas

control is at its Stop/Idle position.

Always switch the transmitter on ﬁ rst and then the

receiver.

Always switch the receiver off ﬁ rst and then the

transmitter.

If this sequence is not maintained, such that the receiver is still switched on when the corresponding transmitter is switched to "OFF", then the receiver may respond to other transmitters or general radio frequency noise. This can cause the model to execute uncontrolled operations that may cause personal injuries and/or property damage.

In particular, for models equipped with a mechanical gyro:

before switching off the receiver, disconnect the model's power supply to prevent the motor from revving up unintentionally.

The residual spin of a gyro often produces so much

voltage that the receiver may falsely interpret a throttle signal! This will then cause the motor to start up unexpectedly.

Range test

Perform checks for proper operation and range before every session. Secure the model adequately in place and ensure that no one is in front of the model.

Perform a complete functional test on the ground and execute a complete simulated ﬂ ight to exclude the possibility of system faults or problems with the model's programming. When doing this, be sure to follow the notices provided on pages 71 and77.

Never operate the transmitter in Model mode, i.e. for ﬂ ying or driving, without an antenna. Be sure the antenna is ﬁ rmly seated in its socket.

Operating a winged aircraft, helicopter, ship or car

Never ﬂ y over spectators or other pilots. Never endanger humans or animals. Never ﬂ y in the vicinity of highvoltage wires. Do not operate the model in the vicinity of sluice locks or where real boats or ships are operating. Do not operate a model on public streets or highways, paths or plazas, etc.

Monitoring transmitter and receiver batteries

You must stop running the model to recharge the transmitter's battery no later than when low transmitter battery voltage triggers the "Batt must be recharged!!" display and acoustic signal.

Check the charge in batteries routinely, particularly the receiver's battery. Do not wait until the movements of controlled mechanisms are noticeably slower. Replace expended batteries before they cause problems.

The battery manufacturer's charging instructions

Safety notices

are always to be followed, this includes mandatory adherence to the length of charging time. Never leave batteries being charged unattended.

Never attempt to charge primary batteries (nonrechargeable batteries) because they can explode.

All secondary batteries (rechargeable batteries) must be charged before every session. To avoid short circuit conditions, ﬁ rst connect the charger cable's banana plugs, polarity correct, into the charger and thereafter connect the charger cable's plugs to the transmitter and receiver batteries.

Disconnect all power sources from the model when it is not to be used for an extended period of time.

Never attempt to use defective batteries, damaged batteries or mixed-type battery combinations as a single group. Do not use mixed combinations of old and new batteries or batteries of different manufacture.

Capacity and operating time

The rule: "capacity is reduced with every successive recharging", applies to all batteries. Internal resistance increases at low temperatures to further reduce capacity. As a consequence, the battery's ability to provide current and hold its voltage is reduced.

Frequent charging or the use of battery maintenance programs can also result in gradual loss of battery capacity. Therefore the capacity of batteries should be checked at regular intervals, not in excess of every six months, and replaced if performance is found to be signiﬁ cantly deﬁ cient.

Purchase only genuine Graupner batteries!

Interference suppression for electric motors

All conventional electric motors produce sparks between their collector and brushes. Depending on the type of

Safety notices

motor involved, this may cause more or less interference with the functionality of the remote control system.

The electric motors of a properly built system should therefore have interference suppression features. For electric drive models it is particularly important that every one of its motors is provided with proper interference suppression. Interference ﬁ lters extensively suppress such disturbances and should always be included.

Follow the respective recommendations included in the motor's operating and installation notices.

For further details about interference ﬁ lters, refer to the Graupner RC main catalog or in Internet at www.graupner.de.

Servo interference ﬁ lters for extension cables

Order No. 1040 The servo interference ﬁ lter is necessary when an

extended-length servo cable is used. This ﬁ lter is attached directly to the receiver output. In critical cases a second ﬁ lter can be attached to the servo.

Using electronic speed controllers

Choosing the right electronic controller is largely a matter of matching controller performance to the motor to be controlled.

In order to prevent an overload or damage to the speed controller, its current rating should be at least half of the maximum locked-rotor current draw of the motor to which it is connected.

Particular attention is appropriate for so-called "tuning motors". Because of their low-turns coils these motors can draw a multiple of their rated current in a lockedrotor condition and this can lead to the destruction of the speed controller.

Electric ignition systems

Combustion motor ignition systems also produce interference that can negatively inﬂ uence remote control functionality.

Always supply power to an electric ignition system from a separate, dedicated battery.

Use only interference-suppressed spark plugs, spark caps and shielded ignition leads.

Mount the receiver sufﬁ ciently far away from ignition system components.

Static charges

A remote control system will be destroyed by the magnetic shock waves produced by a lightning strike even if the storm is miles away. Therefore …

… stop ﬂ ying right away if a storm is approaching. Static charging via the antenna also represents a lethal hazard.

Attention

In order to fulﬁ ll FCC HF emission requirements for • mobile transmitters, a distance of at least 20 cm must be maintained between this system's antenna and other persons when this system is operating. Operation of this system at a lesser distance is therefore not recommended.

To avoid disturbance caused by the electrical • characteristics and emissions of other transmitters, keep at least a 20 cm distance from other transmitters.

Operation of the remote control system requires a • correct program setting for the given country in the transmitter unit. This is necessary for compliance with diverse regulations like FCC, ETSI, CE etc. Follow the respective instructions provided for this with the

transmitter and receiver. Prior to every ﬂ ight, perform a complete functional •

test, range test and execute a complete simulated ﬂ ight in order to exclude the possibility of system faults or problems with the model's programming.

Never program the transmitter or receiver while the • model is being operated.

Care and maintenance

Never clean the housing, antenna, etc. with cleaning agents, gasoline, water or similar means. Use only a dry, soft cloth.

Components and accessories

As manufacturer of this equipment Graupner GmbH & Co. KG recommends only components and accessories which have been tested and approved by Graupner for their suitability, functionality and safety. If this recommendation is followed, Graupner accepts responsibility for the product.

Graupner cannot accept any responsibility for the parts or accessories of other manufacturers which have not been approved and Graupner cannot evaluate every individual product made by other companies to assess if they are safe to use.

Graupner accepts no form of liability for loss, damage or costs consequential to incorrect usage or operation or which can be attributed to same.

Unless otherwise prescribed by law, the obligation of Graupner to provide damage compensation, regardless of legal grounds, is limited to the invoice value of the quantity of Graupner. goods contributing directly to the damage-inducing event. This does not apply if Graupner is found to be subject to unlimited liability pursuant to binding legal stipulations with respect to intent or gross negligence.

Liability exclusion / damage compensation

Graupner cannot monitor compliance with the assembly instructions, the operating instructions or the conditions and methods under which remote control components are installed, operated, utilized or maintained. Therefore

Safety notices

Safety notices and handling instructions for nickel-metal-hydride rechargeable batteries

As applicable for all highly technical products, observance of the following safety notices, along with the handling instructions, is essential for a long service life, fault-free operation, and harmless utilization.

Safety notices

Individual battery cells and batteries are not toys and • must therefore not get into the hands of children.

Batteries/cells must be kept out of the reach of children.

Batteries are to be checked for ﬂ awless condition • prior to every use. Defective or damaged cells/ batteries may no longer be used.

Cells/batteries may only be utilized within the limits • speciﬁ ed by the technical data for the given battery type.

Batteries/cells may not be heated, burned, short-• circuited or subjected to overload current or reverse polarity.

Battery conﬁ gurations formed by parallel • connected cells, combinations of old and new cells, or cells of different production, size, capacity, manufacturer, brand or cell type may not be used.

Remove batteries from the unit prior to long-term • storage periods (weeks or months). Always switch off units whenever they are no longer in use (shortterm). Always charge batteries before it is too late.

The battery to be charged must be placed on a non-• combustible, heat resistant, non-conducting surface during the charging process. Combustible or readily ignited objects are to be kept away from the charging conﬁ guration.

Batteries may only be charged under supervision. • The quick charge current rating for the given type of battery must never be exceeded.

If the battery heats up during charging above 60 °C • charging must be stopped immediately. Allow the battery to cool off to about 30 °C before resuming the charging process.

Never charge batteries which are already charged, • batteries which are hot or batteries which have not been discharged to their end-point voltage.

No modiﬁ cations may be made to the batteries. • Never solder or weld directly on battery terminals.

The mistreatment of batteries presents a danger of • ignition, explosion, chemical burns and combustion burns. Use of an extinguishing blanket, CO extinguisher or sand are suitable methods of extinguishing such a ﬁ re.

Leaking electrolyte is caustic; do not allow it • to contact the skin or eyes. In the event of an emergency, immediately rinse with a generous amount of water and get the care of a doctor.

Battery vent openings may never be blocked or • sealed, e. g. by solder. Soldering temperature may not exceed 220 °C and not be applied for longer than 20 seconds.

To avoid deformation, do not exert excessive • mechanical force.

If a battery should become overcharged, proceed as • follows:

Simply disconnect the battery and place it on a noncombustible surface (e. g. masonry ﬂ oor) until it has cooled off. To avoid the hazards associated with an explosion, never hold the battery in your hands.

-ﬁ re

Pay attention that the charging and discharging rules • are followed.

General notices

Battery capacity is reduced by every charge/discharge cycle. Storage can also be cause for a gradual reduction of battery capacity.

Storage

Batteries should only be stored when they are not in a completely discharged condition. They should be stored in a dry room having an ambient temperature between +5 °C to +25 °C. When stored for longer than 4 weeks, cell voltage should not be more than 1.2 V.

Matching up individual batteries

To match new batteries with older ones, put a full • charge on all of the batteries using a standard charging process. As a rule of thumb, an empty battery must be charged for 12 hours at a current rate equal to one tenth of its speciﬁ ed capacity ("1/10 C" method). The batteries are then all charged equally. Such a matching procedure should be repeated about every 10th charge cycle so that batteries are matched again, which contributes to longer battery life.

If it is possible to discharge individual batteries, this • should be done prior to every charging process. Otherwise the battery pack should be discharged to a voltage of 0.9 V per cell. For example, this corresponds to a charge voltage of 3.6 V for the 4-cell pack used in the transmitter.

Charging

Charging is only permissible at speciﬁ ed current rates, charging durations, temperature ranges and continuous

Safety notices

supervision. If a suitable quick charger is not available on which the exact charging current can be set, the battery can be charged by standard charging according to the 1/10 C-method, see example above.

Whenever possible, transmitter batteries should charged with the 1/10 C method because of the differing charge states of the cells. However, charging current may never be allowed to exceed the maximum permissible rate speciﬁ ed in the given transmitter's instructions.

Quick charging

If your charger offers this option then set the delta • peak charge cutoff voltage to 5 mV per cell. However, most chargers are set to a ﬁ xed value of 15 … 20 mV per cell so they can be used for both NiCd batteries as well as NiMH batteries If in doubt, ﬁ nd out if your charger is also suitable for NiMH batteries by referring to the charger's operating instructions or consulting a dealership. If you are unsure, charge your batteries at half of the speciﬁ ed maximum current rate.

Discharge

All batteries sold under the Graupner and GM-Racing trade names are, depending on battery type, suitable for a continuous maximum current load of 6 … 13 C (check the manufacturer's data). In general, the higher the continuous current load, the lower the battery's service life will be.

Use your battery until its performance degrades or • the under-voltage warning sounds.

Attention:

A cell voltage of 1.2 V should not be underrun during a long storage period. If necessary, charge the

battery before putting it into storage. Reﬂ ex charging and charge/discharge programs •

unnecessarily shorten a battery's service life and are only useful in checking battery quality or to "revive" old cells. It is also meaningless to charge/discharge a battery before using it. The exception to this is if your intention is to check the battery's quality.

Disposal of used batteries

Some countries have laws requiring that all used batteries be turned over to an authorized collection center.

Disposing of batteries along with common household garbage is forbidden. Old batteries can be turned into communal collection centers for disposal at no charge or they can be returned to one of our dealerships or anywhere else where batteries of that given type are sold. Used batteries we have delivered can also be sent back to us, at your cost, through the mail. Use the return address below:

Graupner GmbH & Co. KG Service: Used batteries Henriettenstr. 94 - 96

D-73230 Kirchheim unter Teck This represents an essential contribution to

environmental protection.

Caution: Damaged batteries require among other things, special packaging, because they are very toxic!

Safety notices

mx-20 the newest generation of remote control technology

HoTT (Hopping Telemetry Transmission) is a synthesis of know-how, engineering and testing done around the world by experienced model pilots. HoTT technology combines 2.4 GHz band transmission/reception with bi-directional communications via a "return channel" integrated into the receiver unit.

Based on the Graupner/JR computerized remote control system mc-24 that was introduced in 1997, the mx-20 HoTT remote control system has been especially developed for experienced RC pilots All conventional model types can be readily operated with the mx-20 HoTT system, regardless of whether the model is a winged aircraft, helicopter, ship or land vehicle.

Complex mixed-control functions of guiding surfaces are often necessary for winged aircraft (rudder, elevators) and helicopter models (swashplate). Thanks to this computer technology it is possible to activate these diverse functional requirements with a single "press of a button". Simply select the given model type from the mx-20 HoTT program and its software will automatically assemble signiﬁ cant mixed-control and coupled functions. This eliminates the need for separate modules in the transmitter to implement complex coupled functions and also makes sophisticated mechanical mixer mechanisms in the model unnecessary. The mx-20 HoTT remote control system offers the highest level of safety and reliability.

Its software is clearly structured. Functionally-related options are clearly arranged by content in a simple organization.

The mx-20 HoTT remote control system has 24 model memory locations. Additional ﬂ ight-phase-speciﬁ c settings can be stored in every model memory location.

For example, such settings can be made for various parameters that can be called up to implement particular ﬂ ight maneuvers at the "press of a button".

The large graphic display is well organized and simple to operate. The mixer's graphic representation is exceptionally helpful.

Familiarization with the various functions in this remote control system is quick, even for a beginner, because of its clear, straightforward program structure. The user makes his settings with the four-way, touch sensitive buttons located to the left and right of the high-contrast display. Thus, with only little practice, the pilot learns to implement all of the remote controlled model options with which he/she has experience.

This Graupner HoTT technique theoretically allows over 200 models to be operated simultaneously However, because of the interspersed radio-frequency utilization permitted by certiﬁ cation for the 2.4 GHz ISM band, this number is signiﬁ cantly lower in practical application. Nevertheless, in general more models can be operated simultaneously in the 2.4 GHz band than would be the case in conventional 35 or 40 MHz frequency bands. The real limiting factor is – as often before – is still likely to be the size of available operating space (i.e. airspace for aircraft). Alone the fact that it is no longer necessary to coordinate transmitting frequencies with other pilots in the vicinity (which is sometimes quite difﬁ cult in broken landscapes, such as on hillside slopes) represents an enormous boost for remote control operating security.

The integrated telemetry menu affords simple access to data and HoTT receiver programming. For example, this can be used to map receiver outputs, assign control functions to multiple servos, and to coordinate the magnitude and direction of multiple servo movements

with one another. This handbook describes every menu in detail. There

are tips, many notices and programming examples to supplement the descriptions and also explanations for model speciﬁ c technical terms, like transducer, dual rate, butterﬂ y, etc.

An appendix is provided which contains additional information about the HoTT system. This manual is rounded out with the conformity declaration and the guarantee certiﬁ cate for the transmitter.

Please observe the safety notices and technical notices. Read the instructions carefully then test all functions by simply attaching servos to the receiver included in the kit for order no. 33124. When doing this, please observe the corresponding notice provided on page 20. This will help you learn the essential operating steps and functions of the mx-20 HoTT in the least amount of time.

Always handle your remote controlled model with a sense of responsibility so that you do not endanger yourself or others.

The Graupner team wishes you much fun and success with your mx-20 HoTT remote control system of the newest generation

Kirchheim-Teck, September 2011

Introduction

Computer System mx-20

12 channel remote control s et in 2.4 GHz Graupner HoTT technology (Hopping Telemetry Transmission)

Microcomputer remote control system in modern •

2.4 GHz Graupner HoTT technology Bidirectional communications between transmitter •

and receiver Five different languages:• German, English, French, coming soon per software

update Italian and Spanish. Ultra fast response times due to reliable, direct •

transmission of data from the main processor to the

2.4 GHz HF module. No additional delays due to routing over a module processor.

Telemetry menu for display of telemetry data and • for programming optional attachment sensors and receiver outputs

The telemetry screen provides many programming • and evaluation functions to be presented directly in the transmitters display

Voice output can be called up via freely • programmable switches

Digital servo cycle times of 10 ms selectable• Short antenna, collapsible• Operating and programming techniques are similar •

to the proven concepts implemented in mc-19 to

mc-24

The superior functional security of Graupner HoTT technology accomplished with bidirectional communications between transmitter and receiver with integrated telemetry, freely programmable voice output via headset connector, and ultra-fast response times.

Programming is simpliﬁ ed by a programming technique implemented with capacitive touch buttons.

High contrast, 8 line, blue illuminated graphic display for perfect presentation of all parameter settings and telemetry data. Storage of telemetry data on a micro SD memory card.

Integrated real time clock

4096 steps of 12-bit resolution on the channel signal assures extreme control sensitivity.

USB connection to read and write the model's memories as well as for making ﬁ rmware updates.

High contrast, blue illuminated graphic display • assures perfect control of parameter settings like model type, model memory, clocks and operating voltage.

Function encoder with two touch-sensitive, four-way • buttons permit simpliﬁ ed programming and precise settings

Key-lock function to prevent unintentional operation.• 7 ﬂ ight phases can be programmed•

Introduction - Remote control set

Computer System mx-20

12 channel remote control set with 2.4 GHz Graupner HoTT technology (Hopping Telemetry Transmission)

24 model memories with storage for all model-• speciﬁ c programs and parameter settings

7 switches (2 three stage switches, 3 two stage • switches and 2 touch switches) and 3 digital actuators are already built-in and can be used as desired

Free assignment of switches to switched functions by • simply switching the desired switch

Simple programming of motor and brake switchover • for electric gliders on the K1 joystick.

Internal realtime clock for time-stamping log ﬁ les• User-replaceable CR2032 buffer battery for the •

internal realtime clock Model memory storage in a modern, non-volatile •

backup system 12 control functions with simpliﬁ ed arrangement •

of operating elements for supplementary functions like switches and proportional transducers make operating convenient

Convenience mode selector for simpliﬁ ed switchover • between MODES 1 … 4 (Gas left/right, etc.)

All affected settings are also automatically switched over.

Graphic servo position display for fast, simple • overview and for checking servo movements

Transmitter output swapping• Extensive programs for winged aircraft and helicopter •

models: Winged aircraft menu for: 1 QR, 2 QR, 2 QR + 1, 2

and 4 WK as well as 4 QR + 2 and 4 WK, V tail unit, delta/all-wing, 2 elevator servos

Surface mix: QR-diff, WK-diff, QR  SR, QR  WK, brake  HR, brake  WK, brake  QR, HR

 WK, HR  QR, WK  HR, WK  QR and diff. reduction

Heli menu for: 1-, 2-, 3- and 4-point linkage (1 Sv, 2 Sv, 3 Sv (2 roll), 3 Sv (140°), 3 Sv (2 nick), 4 Sv (90°))

16 free mixers, • 8 linear mixers, 4 curve mixers and 4 cross mixers

Swashplate limiter• ±150 % servo adjustment for all servo outputs, •

independently adjustable per side (Single Side Servo Throw)

Sub-trim in the ±125 % range for setting all neutral • servo positions

Servo reverse can be programmed for all servos • Two stage DUAL RATE/EXPO system, individually •

adjustable for speciﬁ c ﬂ ight phase and switchable during ﬂ ight

Stop watches/countdown timers with alarm function• Copy function for model memory• Built-in DSC jack for connecting ﬂ ight simulators or a •

teacher/pupil system Envisioned for a later update:• Voith-Schneider limiter, works similar to a swashplate

limiter Door sequencer, e. g. for putting down landing gear

automatically or retractable powerplant with runout controller

Nautical program

General HoTT features

Maximum noise immunity due to optimized frequency • hopping and wider channel spread

Intelligent data transfer with correction function•

Realtime telemetry evaluation• Over 200 systems can be used simultaneously• Update capability via USB interface guarantees •

future viability Simple, very fast transmitter to receiver binding• Binding with multiple receivers per model • in parallel

operation is possible Extremely fast rebinding, even at maximum distance• Range test and warning function• Receiver under-voltage warning in the transmitter's •

display Extremely wide receiver operating voltage range of •

3.6 V to 8.4 V (fully functional to 2.5 V) Failsafe• Arbitrary channel assignment (channel mapping), mix •

functions and all servo settings can be programmed in the telemetry menu

Up to 4 servos can be controlled simultaneously as • a block at a servo cycle time of 10 ms (digital servos only)

Introduction - Remote control set

The Order No. 33124 set includes Microcomputer transmitter mx-20 HoTT with built-

in NiMH transmitter battery 4NH-2000 RX RTU ﬂ at (change reserved), plug-in charger and Graupner bidirectional receiver GR-24 HoTT.

Recommended charger units (accessories)

appropriate for

the following

batteries

Order No. Designation

Input voltage 220 V

Input voltage 12 V

NiCd

NiMH

LiPo

lead battery 6411 Ultramat 8 x x x x x

6463 Ultramat 12 plus x x x x x x

6424 Ultramat 14 plus x x x x x x x

6466 Ultra Trio plus 14 x x x x x x x

6468 Ultramat 16S x x x x x x x

6469 Ultra Trio Plus 16 x x x x x x

6470 Ultramat 18 x x x x x x x

6475 Ultra Duo Plus 45 x x x x x x x

6478 Ultra Duo Plus 60 x x x x x x x

6480 Ultra Duo Plus 80 x x x x x x x

Transmitter charger cable, order no. 3022 and receiver charger cable, order no. 3021 are also needed to charge batteries.

Other charger units and details about the listed chargers can be found in the Graupner RC main catalog or in Internet at www.graupner.de.

mx-20 HoTT technical data

Frequency band 2.4 … 2.4835 GHz

Modulation FHSS

Transmit power see country setting, page 227

Control functions 12 functions, 4 of these can

be trimmed

Temperature range -10 … +55 °C

Antennae collapsible

Operating voltage 3.4 … 6 V

Current draw about 180 mA

Dimensions about 190 x 195 x 90 mm

Weight about 770 g with transmitter

battery

integr. balancer

Accessories

Order No. Description

1121 Neck strap, 20 mm wide 70 Neck strap, 30 mm wide 3097 Hand transmitter wind protection

Teacher/pupil cable for mx-20 HoTT

see page 201

Replacement parts

Order No. Description

2498.4FBEC 4NH-2000 RX RTU ﬂ at 33800 HoTT transmitter antenna

Technical data, receiver GR-24 HoTT

Order No. 33512

Operating voltage 3.6 … 8.4 V*

Current draw about 70 mA

Frequency band 2.4 … 2.4835 GHz

Modulation FHSS

Antenna Diversity antennas,

2 x about 145 mm long, about 115 mm encapsulated and about 30 mm active

Plug-in servos 12

Plug-in sensors 1

Temperature range about -10 … +55 °C

Dimensions about 46 x 31 x 14 mm

Weight about 16 g

* The speciﬁ cation for permissible operating voltage range applies

only to the receiver. Please note in this context that receiver input voltage is applied without regulation to connected servos but the voltage range for most connectible servos (speed controls, gyros, etc.) is only 4.8 to 6 V.

Other accessories are listed in the appendix or can be found in Internet at www.graupner.de. Feel free to contact your dealer too. He will be glad to provide advice.

Introduction - Remote control set

Operating notices

Transmitter power supply

The mx-20 HoTT transmitter has a highly capacitive, rechargeable NiMH battery, 4NH-2000 RX RTU (Order no. 2498.4FBEC), as standard equipment. (changes reserved) However, the standard built-in battery is not charged upon delivery of the transmitter.

When the transmitter is used, its battery voltage should be monitored by way of the indicators provided in the LCD display. If battery voltage drops below the adjustable voltage setting (set via item "Batterie warning" in the "Basic Settings" menu, page 226,), default value 4.7 V, an audible warning signal will sound and the message window shown below will appear in the screen

GRAUBELE

#01

0:22h

No later than now, operation must be terminated so the battery can be charged again.

Notice: Be sure that the correct battery type is set in the "Basic

Settings" menu, page 224! NiMH must be set as standard.

Charging the transmitter's battery

The transmitter's rechargeable NiMH battery can be recharged by connecting the charging jack located, on the right side of the transmitter, with the included charger (order no. 33116.2).

As a rule of thumb for charging time, an completely

Operating notices

4.6V

battery needs charging

10%

Stop Flug

«normal »

K78

0:00 0:00

HoTT

0.0V

discharged battery will require 12 hours to recharge at a current rate equal to one tenth of its speciﬁ ed capacity. For the standard transmitter battery and included charger, this is a current rate of 200 mA. However, you must yourself ensure that the charging process is terminated when it should be …

The transmitter must be switched "OFF" during the entire charging procedure. Never switch on the transmitter when it is connected to the charger. Even a brief interruption to charging can cause charging voltage to rise to a level that will immediately damage the transmitter with over-voltage. Also for this reason, be sure all connectors are always plugged in securely and have good contact.

mx-20 HoTT charging jack polarity

The charger cables on the market from other manufacturers often have different polarities. Therefore use only an original Graupner charger cable, order no. 3022.

Charging with automatic chargers

The transmitter's charger jack does come standard with reverse polarity protection but nevertheless it can be used with suitable chargers for quick charging the transmitter's battery.

Set the quick charger unit, according to its manual, for a delta peak voltage difference of 5 mV … 20 mV or equivalent such that it is adapted for quick charging NiMH cells

First connect the charger cable's banana plugs to the charger and only then connect the cable's other end into the charging jack on the transmitter. Never allow the bare ends of the banana plugs to come

into contact with one another when the other end of the cable is plugged into the transmitter. In order to prevent damage to the transmitter, charging current should never exceed 1 A. If necessary, limit the current at the charger.

Removing the transmitter's battery

To remove the transmitter's battery, ﬁ rst unlatch the cover of the battery compartment on the rear side of the transmitter housing then remove the cover.

Take out the transmitter's battery then disconnect the transmitter battery's connector by carefully pulling on the supply line cable.

Inserting the transmitter's battery

Hold the transmitter battery connector such that the black or brown cable is oriented toward the antenna side and the empty jack of the battery connector is oriented toward the ﬂ oor side then push the battery connector in the direction of the board onto the three pins sticking out out of the board inside the transmitter. (The battery connector is protected against a reverse polarity connection by two slanted edges, see illustration.)

Place the battery into its compartment and close the cover.

Transmitter connector polarity

Battery operation timer at the bottom left of the screen

This timer shows the transmitter's cumulative operating time since the transmitter's battery was last charged.

This timer is automatically reset to "0:00" when the transmitter is switched on and its battery voltage is signiﬁ cantly higher than when the transmitter was last used, e. g. because the battery was charged.

GRAUBELE

#01

5.9V

0:00h

Lithium battery, CR 2032

At the left side of the transmitter board there is a ﬁ xture for a lithium battery. The user can replace this battery when necessary with another lithium battery of type CR 2032:

This battery maintains the date and time settings during a transmitter power supply outage, for example when the transmitter's main battery is being replaced.

Stop Flt

«normal »

K78

0:00 0:00

HoTT

0.0V

Operating notices

Receiver power supply

A selection of 4 and 5 cell NiMH battery packs having different capacities are available to power the receiver. If digital servos are in use, we recommend a 5 cell battery pack (6 V) to afford adequate battery capacity. If analog and digital servos are used in mixed operation, be sure to pay attention to the given maximum permissible operating voltage. A stabilized, adjustable power supply for the receiver with 1 or 2 receiver batteries can be provided, e. g. the PRX-unit, order no. 4136, see appendix.

For reasons of safety, do not use battery boxes or dry cell batteries.

The voltage of the on-board power supply will be displayed at the bottom right of the transmitter's screen while the model is in operation.

GRAUBELE

#01

5.2V

2:22h

If the adjustable warning threshold (default value 3.8 V) set in the Telemetry menu, see page 217, is underrun, an optical and acoustic under-voltage warning will be issued.

Despite this feature, be sure to check the condition of the battery at regular intervals. Do not wait for the warning to be issued before recharging the battery.

Notice: An overview of available batteries, chargers and current source test instruments can be found in the Graupner RC main catalog or in Internet at www.graupner.de.

Operating notices

Stop Flt

«normal »

K78

0:00 0:00

HoTT

5.5V

Charging the receiver battery

Charger cable, order no. 3021, can be plugged directly onto the receiver's battery for charging. If the battery in the model is connected by way of an order no. 3046, 3934, 3934.1 or 3934.3 power supply cable, then charging can be accomplished via the charging jack or special charging connector integrated into the switch. The switch in the power supply cable must be in its "OFF" position for charging.

Receiver battery connection polarity

General charging notices

The charging instructions for the charger as well as • for the battery from its manufacturer to be observed.

Pay attention to the maximum permissible charging • current speciﬁ ed by the battery's manufacturer. In order to prevent damage to the transmitter, charging current should never exceed 1 A. If necessary, limit the current at the charger.

If the transmitter battery is nevertheless to be • charged at a current rate in excess of 1 A, then it is imperative that this is done outside the transmitter. Otherwise there is a risk of damage to the transmitter's board due to overloading its printed circuit paths and/or overheating of the battery.

If an automatic charger is to be used for charging, • perform several test charging procedures to ensure the ﬂ awless functionality of its automatic shut-off. This applies particularly if you want to charge the standard installed NiMH battery with an automatic charger unit intended for NiCd batteries Monitor the charger's shut-off behavior if it has that option.

Do not execute a battery discharge or battery • maintenance program through the charger jack. The charger jack is not suitable for this purpose.

Alway connect the charger cable to the charger ﬁ rst • and then to the receiver or transmitter battery. This avoids the possibility of shorting the bare banana plug ends together.

If the battery heats up signiﬁ cantly, check the • battery's condition, replace the battery or reduce the charging current.

Never leave a charging battery unattended.•

Follow the safety notices and handling • instructions provided on page 8.

Joystick length adjustment

The length of both joysticks can be continuously adjusted to adapt these transmitter controls to the pilot's preference.

Hold the lower half of the knurled grip in place then turn the upper section to release its counter-locked threads.

Now pull up or push down on the joystick's end to the desired length. When the length is suitable, tighten the counter-locked threads of the upper and lower sections again.

Opening the transmitter housing

Carefully read the notices below before opening the transmitter housing. It may be better if unexperienced users ask a Graupner Service location to take care of the procedures described below.

The transmitter should only be opened in the following situations:

to convert a neutralized joystick to a non-neutralized • joystick or a non-neutralized joystick to a neutralized joystick.

to adjust joystick return tension.•

Switch off the transmitter before opening its cover (power switch to "OFF").

Open the battery compartment as described on the previous double-page, remove the battery and if a micro SD card is inserted be sure to remove it too.

Once the battery and any micro SD card have been removed, loosen the six countersunk screws on the rear

of the transmitter with a Phillips, size PH1, screwdriver, see illustration.

Housing screw locations

Hold the two housing sections together by hand then turn the transmitter upright over a suitable surface so these 6 screws can fall out without getting lost. Now lift up on the backplate carefully and turn it open to the right like you would open a book.

A T T E N T I O N:

Two multi-conductor cables connect the backplate with the transmitter electronics in the upper section. These connections must not be damaged.

Important notices:

Make no modiﬁ cations of any kind to the circuitry • as this will void the guarantee as well as the unit's ofﬁ cial permit.

Be sure not to touch the circuit boards with any • metallic objects. Do not touch contacts with your ﬁ ngers.

Never switch the transmitter on when its housing • is open.

When you close the transmitter again, be sure that …

… no cables are caught between housing edges • when the backplate is put into position.

… both housing parts are properly seated with one • another before screwing them together. Never force the housing sections together.

Turn the screws down into the existing housing • threads without stripping them out.

… reconnect the battery.•

Operating notices

Do not touch the

circuit board!

Do not touch t

he circuit board!

left

joystick aggregate

right

joystick aggregate

neutralization screw

brake springs

collapsible antenna

adjustment screw for joystick restoration force

Do not touch t

he circuit board!

Converting joysticks

Neutralization

Both the left and the right joystick can be conﬁ gured for neutralized or non-neutralized operation as desired. Open the transmitter housing as previously described.

To change the joystick's factory setting, locate the screw shown in the ﬁ gure below enclosed in a white circle.

Notice: The aggregate for the right joystick is a mirror image of the left joystick so the corresponding screw for the right joystick is on the right side just below the middle.

neutralization screw

brake springs

adjustment screws

Charger jack

user-replaceable CR2032 lithium battery to buffer the integrated realtime clock

Operating notices

right

joystick aggregate

Do not touch the

circuit board!

left

joystick aggregate

Slot for memory cards

adjustment screws

Now turn this screw down until the respective joystick is free to move from limit to limit - or turn the screw out until the joystick again completely self-restoring.

horizontal

vertical

Brake spring and ratchet

The outboard screw of the two marked in the next ﬁ gure adjusts the braking force and the inboard screw adjusts the strength of the ratchet for the respective joystick.

Notice: The aggregate for the right joystick is a mirror image of the left joystick so corresponding screws for the right joystick are located at the top left.

Joystick restoring force

The joystick's restoring force can also be adjusted to the pilot's preference. The adjustment is located next to the return springs, see markings in the ﬁ gure below.

Spring force for the given direction of motion can be adjusted by turning the respective screw with a Phillips screwdriver.

Right turn (clockwise) = return harder,•

Left turn (counter clockwise) = return softer.•

vertical

horizontal

Notice: The aggregate for the right joystick is a mirror image of the left joystick so corresponding screws for the right joystick are located to the right of the middle.

Operating notices

Transmitter description

Transmitter operating elements

Attaching the transmitter's neck strap

There is an eyelet on the top side of the mx-20 HoTT transmitter (see ﬁ gure at the right) to which a neck strap can be attached. This anchor point has been chosen because the transmitter is optimally balanced here when it hangs from the strap.

Order No. 1121 Neck strap, 20 mm wide Order No. 70 Neck strap, 30 mm wide

Important notice: In its delivered conﬁ guration, the transmitter can only operate any servos attached to the receiver by way of the two joysticks. For reasons of ﬂ exibility, all other operating elements (CTRL 6 … 8, SW 1 … 9) are designated as "free" by the software. These other operating elements can be freely assigned to actuators as described in the text for the "Control adjust" menu on page 96 (winged aircraft models) or page 100 (helicopter models).

Transmitter description

antenna with kink and twist joint

proportional speed control CTRL 7

2 position switch SW 8

3 position switch SW 4/5 or CTRL 9

2 position momentary contact switch SW 1

proportional speed control CTRL 6

left joystick

trimmer

ON/OFF switch

left touch pad

LC display

main status LED

eyelet for neck strap

proportional speed control CTRL 8

carrying handle

2 position momentary

contact switch SW 9

2 position switch SW 2

3 position switch

SW 6/7 or CTRL 10

2 position switch SW 3

right joystick

trimmer

right touch pad

Transmitter rear side

Data jack for connecting the Smart-Box, Order No. 33700

DSC jack for connecting ﬂ ight simulators and for teacher/pupil mode

housing screw

earplugs or headset connector

ﬁ ve-pole mini USB socket for connecting the transmitter to a PC

housing screw

Headset connector

The jack centered in the lower portion of the type plate on the back of the transmitter is for connecting conventional earplugs or a headset by way of a 3.5 mm audio plug. (not included in the set)

The transmitter's acoustic signals as well as those signals associated with the telemetry menu are output via this connection. These announcements are made in German language by default. More details about "Voice output" can be found in the section "HIDDEN MODE" beginning on page 28 and "Telemetry" beginning on page 208.

The headset connector's volume control can be adjusted in the "Voice volume" line of the "Basic Settings" menu, see page 227.

Mini-USB connector

This connector socket is used to establish a connection between the transmitter and a PC running a Windows operating system (XP, Vista or Windows 7). The PC software required, such as a suitable USB driver, can be found on the download page for the given product on the Graupner website at www.graupner.de.

Once the necessary software is installed on the PC, this USB connection can be used to update the transmitter or even just to set the date and time in the transmitter.

Charger jack for transmitter battery

housing screw

battery compartment cover

housing screw

Data jack

For connecting the optionally available Smart-Box, Order No. 33700.

Details about the Smart-Box can be found with the given product in the Graupner RC main catalog or in Internet at www.graupner.de.

Transmitter description

DSC

Direct Servo Control

The acronym "DSC" is a carryover which stands for the original "Direct Servo Control" function. However, in HoTT systems the "direct servo control" function is no longer available via a diagnose cable due to technical reasons.

The standard two-pole DSC jack in the mx-20 HoTT transmitter is used as the teacher or pupil jack as well as an interface to ﬂ ight simulators.

To ensure a proper DSC connection, please observe:

Make any necessary menu changes.

Refer to the section beginning on page 198 to adapt the mx-20 HoTT transmitter to a teacher/pupil system.

When operating a ﬂ ight simulator or when operating 1. the mx-20 HoTT transmitter as a pupil transmitter, ALWAYS leave the transmitter's ON/OFF switch in the "OFF" position as only in this position does the transmitter's RF module remain inactive after the DSC cable is inserted. This also reduces the transmitter's power consumption somewhat.

The main status LED should now constantly illuminate red and the transmitter's basic setup screen should show the string "DSC pupil" on the right just below the middle timer. At the same time, the display of telemetry indicators will be suppressed.

PUPIL

#11

5.9V

0:01h

Stop Flt DSC

«normal »

0:00 0:00

HoTT

0.0V

Thus the transmitter is ready for operation. To the contrary, teacher mode for the mx-20 HoTT

transmitter requires that the transmitter be switched on prior to plugging in the respective cable.

Connect the other end of the cable to the desired unit 2. in compliance with the given operating instructions for that unit.

Important:

Be sure that all connectors are seated ﬁ rmly in their respective sockets.

Notice about ﬂ ight simulators: Because of the myriad of ﬂ ight simulators available on the market, it may be necessary to have the contact layout of the audio plug or DSC module appropriately modiﬁ ed by Graupner Service.

Data storage

Card slot

micro SD and micro SDHC With the mx-20 HoTT transmitter switched off,

removing the battery compartment cover and the transmitter's battery will make the card slot accessible (located in the right sidewall of the battery compartment). This card slot is intended for micro SD and micro SDHC type memory cards.

All conventional micro SD memory cards up to 2 GB and micro SDHC cards up to 32 GB storage capacity can be used. However, as a manufacturer we recommend the use of memory cards no larger than 4 GB as this is completely adequate for all normal situations.

The type of memory card referred to here became known in conjunction with digital cameras and cell phones. It is to be pushed into the slot with its contacts upward, front facing the rear wall and latched in position there. After re-installing the battery and closing the battery compartment, the transmitter can be switched on again. The stylized image of a memory card will appear in the basic setup screen to indicate the presence of the inserted memory card.

Transmitter description

GRAUBELE

#01

5.2V

3:33h

Notice: If a micro SD card is inserted, be sure to remove it BEFORE taking off the transmitter's backplate. Otherwise there is a risk of damaging the memory card.

Data acquisition / storage

The storage of data on the SD card is coupled to the ﬂ ight timer. If this timer is started – when a suitable memory card is inserted in the card slot and a telemetry link to the receiver exists – both the timer and data acquisition will stop when the ﬂ ight timer is stopped. The ﬂ ight timer is started and stopped as described in the section "Timers (general)" on page 138.

While data acquisition is ongoing, the on-screen card image will blink continuously at a slow rate.

The amount of data written on the memory card is presented as a black bar graph which grows from left to right as data ﬁ lls the memory card.

After a data acquisition session is ﬁ nished, there will be an (empty) folder "Models" and a "LogData" folder on the memory card. Within the "LogData" folder there will be log ﬁ les in sub-folders that are designated with names in the format 0001_year-month-day.bin, 0002_ year-month-day.bin, etc. If a model memory folder is still "unnamed" when the memory card is removed from the transmitter and inserted into the card slot of a PC or laptop, the respective log ﬁ les can be found in a sub-

Stop Flt

«normal »

K78

0:00 0:00

HoTT

5.5V

folder designated "NoName". There is a PC program available on the transmitter's download web page at www.graupner.de with which the stored data can be evaluated on a compatible PC.

Importing voice ﬁ les

As already mentioned in the section "Headsets" on page 21, this connection can also be used to output the transmitter's acoustic signals as well as those signals and announcements associated with telemetry menu settings. These announcements are made in German language by default. These announcements are summarized in a voice packet which is stored in a transmitter-internal memory but they can be replaced by a voice packet of a different language at any time. More information about this can be found in the section "HIDDEN MODE" beginning on page 28.

Importing/exporting model memories

Any model memory can be stored to an inserted memory card or from an inserted card into the transmitter. This feature is intended to support data exchange between identical transmitters or even use as data backup. More information about this can be found in the section "Copying/deleting" beginning on page 64.

Notice: Some special symbols that can be used in model names are subject to speciﬁ c restrictions associated with the FAT or FAT32 ﬁ le system used by the memory cards and these special symbols will be replaced during the copy process with a tilde (~).

Transmitter description

Display and keypad

optical indication of trim lever positions or, during activation of speed controls CTRL 7 + 8, an alternative display of the current positions of these controls

Model name

Memory location 1 … 24

left touch pad

  paging  simultaneously pressed:

Change to the servo display menu

ESC = cancel/return ESC touched for about 1 s:

Change to the Telemetry menu and return to basic display

Battery voltage and charge state bars

(if the preset threshold voltage is underrun, a warning will appear – see "Warnings" on page 36 –, and an acoustic warning tone will sound)

Model type indicator

(winged aircraft / helicopter)

Stopwatch in min:s (upward/downward)

Receiver power supply voltage

Flight phase name

switchover between ﬂ ight phases by switch

possible warnings, see page 36

Flight timer in min:s

(upward/downward)

right touch pad:

  Paging / changing values

SET select / conﬁ rm

simultaneous pressing of

 or  = CLEAR

Battery time since last

re-charge in h:min

Transmitter description - Display and keypad

Signal strength indicator

Operating the "data terminal"

Entry keys ESC and SET

Display symbols

Displayed telemetry symbols

the active model memory has not yet "bonded"

with a HoTT receiver. More about the "Binding" process, see page 69 or 75.

non-blinking: Switched off on RF transmitter side

blinking antenna symbol: The last receiver bound to the active model is

inactive or out of range >M x no telemetry signal to receive >M signal strength indicator >P indicator for pupil signal strength on the teacher

transmitter display

Keys left of the display

ESC• key

brief repeated pressing the ESC key will cause a stepwise return to the function selection screen or even further to the base screen. Any changes made to settings remain.

Momentarily touching the ESC key for about 1 s while in the base screen will open and close the Telemetry menu.

arrow keys •  

Momentarily pressing one of these keys will cause 1. analogous paging in the given arrow direction through lists, e. g. through the model selection list or the multi-function list or within menus though the menu's lines.

Simultaneous pressing on 2.  will change the transmitter's base screen and almost any menu position to the "Servo display" menu.

Keys to the right of the display

SET• button

After switching the transmitter on, brieﬂ y pressing 1. the

SET key will cause a jump from the displayed

base screen to the Multi-function menu. In the same manner a selected menu can now be called up with the SET key.

Momentarily pressing the 2. SET key from within the Basic Settings menu will activate / deactivate (conﬁ rm) the given setting ﬁ elds.

arrow keys •  

1. "Paging" through the Multi-function menu and the menu lines within the Basic Settings menu analogous to the arrow keys of the left touch pad.

2. Select or set parameters in setting ﬁ elds after they have been activated by brieﬂ y touching the SET key, whereby the  keys and  are used for the same corresponding functions. In this case it is completely irrelevant which of these two keys are used.

By brieﬂ y pressing the 3.  keys simultaneously or  an altered parameter value for the active entry ﬁ eld will again be restored to its default value (CLEAR).

Notice:

Touching the given touch pad does not itself initiate • the given action but rather the end of the touch.

In the event the touch pads do not exhibit any • functionality immediately after switching the transmitter off and then on again right away, this is not a fault. Just switch the transmitter off again then wait for several seconds before switching it on again.

Transmitter description - Display and keypad

Shortcuts

The following key combinations can be used to directly call up certain menus and options:

CLEAR• Brief simultaneous activation of the  keys or

 on the right touch pad will restore the active entry ﬁ eld's changed parameter value back to its default value.

"• Servo screen" Brief simultaneous activation of the  keys of the

left touch pad will cause a jump from the transmitter's base screen or from almost any menu position to the "Servo" menu, see page 230.

"• Telemetry" menu Press the center

about 1 s to call up the "Telemetry" menu from the transmitter's base screen, see text beginning on page 208, or to return to the base screen again.

Graphic display of telemetry data•

Brieﬂ y touching one of the arrow keys of the left or right touch pad will cause a jump from the base screen directly to the transmitter's graphic display of telemetry data or will allow paging back and forth between individual graphic displays.

Brieﬂ y touching the centered ESC or SET key will cause a return back to the base screen.

"• HIDDEN MODE" (language selection and contrast)

Press and hold arrow keys  of the left touch pad then momentarily touch the SET key of the right touch pad, see next double-page.

Entry lockout• Entry lockout is activated and deactivated from the

base screen by simultaneously pressing the ESC

ESC key in the left touch pad for

and SET keys for a little longer (about 2 s).

Quick-Select•

From the multi-function list, a jump can be made to a "Structure overview" by a brief, simultaneous touch on the  or  keys of the right touch pad. Menus are arranged in clear groups in this overview.

All menus

Memory Servo settings Transm. controls Switches Flight phases Timers Mixers Special funct. Global functions

Now the desired group can be selected with the  arrow keys of the left or right touch pad …

All menus

Memory

Servo settings Transm. controls Switches Flight phases

… and then brieﬂ y touching the center SET key in the right touch pad. As soon as the key is released, only the respective generic term for the given menu will remain listed. For example:

Model select

Copy / Erase Suppress menus Suppress models

Transmitter description - Shortcuts

Concealed menu columns

Some menus have concealed columns to improve legibility. Menus with concealed columns can be recognized by virtue of a triangle pointing to the right in the bottom left corner of the screen. For example, in the menu "Servo settings":

S1 S2 S3 S4 S5

Rev cent

In this menu, e. g. the column "lim" +" (servo travel limit) to the right of column "- travel +" is "concealed".

To reach this column, use the pointing triangle at the bottom left of the screen to push the frame marker with the arrow key  of the left or right touch pad to just beyond the column for "- travel +":

S1 S2 S3 S4 S5

Rev cent

0% 0% 0% 0% 0%

100% 100% 100% 100% 100%

150% 150% 150% 150% 150%

100% 100% 100% 100% 100%

trv

150% 150% 150% 150% 150%

lim

S1 S2 S3 S4 S5

Rev cent

This procedure is analogous for the other menus.

0% 0% 0% 0% 0%

100% 100% 100% 100% 100%

trv

To again return to the now-concealed column "- travel +" or even further to the left, push the frame marker with arrow key  of the left or right touch pad appropriately to the left:

Transmitter description - Concealed menu columns

HIDDEN MODE

Language selection and display contrast The mx-20 HoTT transmitter's "HIDDEN MODE" can

be reached from almost any menu position by pressing and holding the  arrow keys of the left touch pad

SET key of the right touch pad for about one

and the second until the screen shown below is displayed.

 HIDDEN MODE  CONTRAST LANGUAGE VOICE STICK CALI.

CONTRAST

The screen's contrast characteristic can be adapted as needed in this screen's "CONTRAST" line, as described in more detail on pages 226/226, by tapping on the center SET key of the right touch pad. Tapping again on the SET or ESC keys will cause a return to line selection.

The line …

LANGUAGE

… can be reached by tapping arrow key  in the left or right touch pad. One of the transmitter's available languages can then be selected from the screen which appears.

HIDDEN MODE  CONTRAST LANGUAGE VOICE STICK CALI.

Activate language selection by pressing on the center

Transmitter description - Hidden mode

0 DEUTSCH DEUTSCH

SET key in the right touch pad.

HIDDEN MODE  CONTRAST LANGUAGE VOICE STICK CALI.

DEUTSCH

Now the default language "GERMAN" can be replaced with the desired language by making a selection with the arrow keys of the right touch pad. For example:

 HIDDEN MODE  CONTRAST LANGUAGE VOICE STICK CALI.

ENGLISH

DEUTSCH

Conﬁ rm the selection by tapping again on the center

SET key in the right touch pad. All settings stored in the

transmitter remain intact after a change of language has been made.

The following languages are available for selection at the time this handbook was printed:

German• English• French•

The Italian and Spanish languages are planned for inclusion at a later point in time. These will then be made available by way of an update download from the transmitter's web page at the Graupner website www.graupner.de.

VOICE TRIGGER

As mentioned in section "Headsets" on page 21, the transmitter's acoustic signals as well as those signals and announcements associated with the telemetry menu can be output by way of the headset connector. These announcements are made in German language by default. These announcements are summarized in a voice packet which is stored in a transmitter-internal memory but they can be replaced by a voice packet of a different language at any time.

The following languages are available for selection at the time this handbook was printed:

German• English• French•

The Italian and Spanish languages are planned for inclusion at a later point in time. These will then be made available on the transmitter's download web page at the Graupner website www.graupner.de.

The given active language packet can then be swapped out either with the PC program (also available as a download from the transmitter's web page at www.graupner.de) or per SD card as described below.

Preparation

If not already done, insert the SD card or SDHC card into the transmitter as described on page 22. Now when the transmitter is switched on it will perform some operations which will include the creation of a "VoiceFile" on the memory card.

Take this memory card, which has now been prepared by the transmitter, out of the transmitter and insert it into a suitable card reader. If necessary, attach the card reader to your PC or laptop. Now copy the language

packet downloaded from the transmitter's web page (e.g. "voice_gb.vdf") into the folder created by the transmitter. Now take the memory card out of the card reader and re-insert it into the transmitter. Once the memory card is inserted in the transmitter, switch the transmitter on with RF switched off.

 HIDDEN MODE  CONTRAST LANGUAGE VOICE STICK CALI.

0 ENGLISH

ENGLISH

Notice:

If the warning …•

MUST BE

OFF

Please select

RF on/off?

OFF

Language change

Use the left or right arrow touch key to select the line "VOICE".

 HIDDEN MODE  CONTRAST LANGUAGE VOICE STICK CALI.

ENGLISH

DEUTSCH

Activate language selection by pressing the center SET key in the right touch pad.

 HIDDEN MODE  CONTRAST LANGUAGE VOICE STICK CALI.

0 ENGLISH

DEUTSCH

Now use the right touch pad arrow keys to replace the default language "DEUTSCH" with the language you want. For example:

Conﬁ rm your selection with another tap on the center

SET key in the right touch pad. The selected language

packet will be loaded into the transmitter's memory.

 HIDDEN MODE  CONTRAST LANGUAGE VOICE STICK CALI.

22/100%

0 ENGLISH

ENGLISH

The loading process is ﬁ nished as soon as the progress bar at the lower edge of the display disappears.

 HIDDEN MODE  CONTRAST LANGUAGE VOICE STICK CALI.

0 ENGLISH ENGLISH

When this process is ﬁ nished, switch off the transmitter. All settings stored in the transmitter remain intact after a

change of language has been made.

… appears, then the transmitter's RF radiation is still active. Jump to the "Basic settings" menu, select the "RF transmit" line, select its "OFF" option and then repeat the procedure

If the warning …•

SD-CARD

INSERT

… appears then the transmitter does not detect a memory card in its card slot or the card found cannot be read.

If the warning …•

MISSING

IMPORT

DATA

… appears then the transmitter could not ﬁ nd an appropriate ﬁ le on the inserted memory card.

JOYSTICK CALIBRATION

If you feel the neutral position of your self-calibrating joysticks (controls 1 … 4) are not exactly 0 % of their control travel, then this can be checked and, if necessary, corrected as follows.

Jump to the "Model select" menu and initialize a free model memory as described on page 60. Whether the model to be initialized is a winged aircraft or a helicopter is irrelevant.

Transmitter description - Hidden mode

Wait for the notices which typically appear in the base screen following a model change then jump to the "Servo display" menu, for example by simultaneously touching the  keys of the left touch pad (WITHOUT any interim change to trim settings or other program settings).

If all four of your transmitter's joystick functions are still self-neutralizing, this display should ideally look like the one shown below.

1 3 5 7 9

–100 %

0% 0% 0% 0% 0%

2 4 6 8

0% 0% 0% 0% 0%10 0%

Otherwise the graph bars show current setting percentages for joystick control functions which are not self-neutralizing – typically for the "K1", throttle/brake or throttle/pitch, control stick. For example, if the throttle/ brake control stick is in its "quarter-throttle" position, the display would appear as shown below.

–50%

1 3 5 7 9

0% 0% 0% 0% 0%

2 4 6 8

0% 0% 0% 0% 0%10 0%

One after the other, put both joysticks into each of their four possible limit positions without exerting force at the limit position. In each of these eight possible limit positions, the – side dependent – indication for exactly

-100 % or +100 % should be displayed. For example,

if Control 2 is at its left limit and the other three joystick functions are in their respective middle positions then your transmitter's display should look like the one shown below.

1 3 5 7 9

0% 0% 0% 0% 0% 0%

2 4 6 8

–100 %

0% 0% 0% 0%10 0%

Regardless of the number of self-neutralizing joystick functions available on your transmitter, if these checks produce four 0 % results and eight 100 % results then your transmitter's joysticks are optimally calibrated. You can terminate this process then, if appropriate, delete the model memory just created.

Otherwise jump (as described at the outset of the previous double page) to the "Stick cali." line in the "HIDDEN MODE" menu then brieﬂ y touch the center

SET key in the right touch pad.

STICK CALIBRATION

CONTRAST LANGUAGE VOICE STICK CALI.





0 ENGLISH DEUTSCH

The arrow keys  of the right touch pad will now allow you to cyclically select the four calibrated joystick planes, e.g. the left/right plane of the right joystick.

STICK CALIBRATION

CONTRAST LANGUAGE VOICE STICK CALI.



ENGLISH



DEUTSCH

Now position the right joystick – without exerting extra force – to its left limit corresponding with the on-screen blinking arrow pointing to the left.

STICK CALIBRATION

CONTRAST LANGUAGE VOICE STICK CALI.

+100%



ENGLISH



DEUTSCH

… and brieﬂ y touch the center SET key in the right touch pad. This concludes this example calibration of the right joystick's left limit. The circle in the middle of the stylized joystick plane will now blink as conﬁ rmation of the calibration.

STICK CALIBRATION

CONTRAST LANGUAGE VOICE STICK CALI.

+100%



ENGLISH



DEUTSCH

Now release the self-neutralizing joystick so it can return to its center position and then tap again on the center

SET key to calibrate the joystick's centered position. The

right arrow marker will begin to blink.

Transmitter description - Hidden mode

STICK CALIBRATION

CONTRAST LANGUAGE VOICE STICK CALI.



ENGLISH



DEUTSCH

Repeat the calibration process for the right limit of the right joystick. The other joystick planes are calibrated analogously.

Notice:

Correct any bad calibrations by repeating the • respective process.

Within a given joystick plane, each of the three • calibration positions can be selected directly with the  arrow keys of the left or right touch pad.

Brieﬂ y touching the center ESC key of the left touch pad will terminate the process and return to the sub-menu "Stick cali.".

Transmitter description - Hidden mode

Telemetry data display

As described on page 220 in the context of sub-menu "SENSOR SELECT" for the "Telemetry" menu …

Model select Copy / Erase

Suppress models

Base setup model Model type Suppress: TOG

… the output of sensors attached to the receiver can be processed and activated for graphic presentation on the screen. This data is then appropriately displayed by the graphic indicators described below.

These graphic elements can be reached from the transmitter's base screen by brieﬂ y touching the  or  keys of the left or right touch pad. Page back and forth between individual graphic elements with the same keys and return to the base screen again with the ESC key.

Notice: The sequence of the following element descriptions corresponds to their selection sequence when touching the  key.

More details about the following named modules can be found in the appendix and in Internet at www.graupner. de in the web page for the given product.

RECEIVER

RX–S QUA: 100% RX–S STR: 100% RX–dBm: 33dBm TX–dBm: 33dBm

L–PACK: 10ms

RX–VOLT:4.8 TMP

CH OUTPUT TYPE:ONCE

R–LOW V:4.6 +22°C

This screen presents the "RX DATAVIEW" of the Telemetry menu's "SETTING & DATA VIEW", see page 209, with data processed and displayed graphically.

The displayed items are as follows:

Value Explanation

RX-S QUA signal quality in %

RX-S ST signal strength in %

RX-dBm reception power in dBm

TX-dBm transmit power in dBm

V PACK Indicates the longest time span in ms

in which data packages are lost in the transmission from the transmitter to the receiver.

RX-VOLT current operating voltage of the

receiver's power supply in volts

M-RX V lowest receiver operating voltage since

last startup, in volts

TMP the thermometer depicts the receiver's

current operating temperature

AKKU 1 (GENERAL + ELECTRIC modules)

0.0V

0.0A 0mAh

This display depicts current voltage, current current draw and, if attached, the expended capacity of "Batt 1" connected to the General-Engine (Order No. 33610), General-Air (Order No. 33611) or Electric-Air module (Order No. 33620).

SENSOR 1 (GENERAL + ELECTRIC module)

SENSOR 1

0.0V 0°C

If attached, this display depicts currenly measured voltage and temperature from a "T(EMP)1" temperature/voltage sensor, Order No. 33612 or 33613 for General-Engine (Order No. 33610), General-Air (Order No. 33611) or Electric-Air module (Order No. 33620).

Transmitter description - Telemetry data display

SENSOR 2 (GENERAL + ELECTRIC modules)

Vario

GPS

SENSOR 2

0.0V 0°C

If attached, this display depicts currently measured voltage and temperature from a "T(EMP)2" temperature/ voltage sensor, Order No. 33612 or 33613 for GeneralEngine (Order No. 33610), General-Air (Order No. 33611) or Electric-Air module (Order No. 33620).

Rotary speed sensor

U/min

If attached, this display depicts the speed measured by a speed sensor, Order No. 33615 or 33616, for a General-Engine (Order No. 33610), General-Air (Order No. 33611) or Electric-Air module (Order No. 33620).

Notice: The appropriate blade count must ﬁ rst be set in the module's telemetry menu before the correct speed can be displayed.

m m

km/h DIS

m/s ALT

0.0

If attached, this display will depict altitude relative to location or starting location (in m) as well as the current ascent/decent rate (in m/s) from data provided by a GPS-/Vario module (Order No. 33600) or Vario module (Order No. 33601) connected to the receiver's telemetry connection.

GPS

Kmh

If attached to the receiver, this display will depict the data from a GPS module with integrated Vario, Order No. 33600.

The displayed items are as follows:

Value Explanation

km/h Speed

DIS horizontal distance in m

m/s ascent/decent rate in m/s

ALT altitude relative to starting location in m

0 0

0.0 0

If attached to the receiver, this display will depict the data from a GPS module with integrated Vario, Order No. 33600.

Aside from the model's current position and speed, the center section of this screen will also display current altitude with respect to the starting location as well as the model's current ascent/decent rate in m/1 s, m/3 s and m/10 s, current reception quality and the model's distance from its starting location.

The displayed items are as follows:

Value Explanation

W / N / E / S west / north / east / south

Kmh speed

RXSQ return channel signal strength

DIS distance

ALT current altitude with respect to starting

m/1 s m/1 s ascent/decent rate

m/3 s m/3 s ascent/decent rate

m/10 s m/10 s ascent/decent rate

Kmh

RXSQ 0 DIS 0m ALT 0m

0.0m/1s

N 0°00.0000 E 0°00.0000

0m/3s

0m/10s

Transmitter description - Telemetry data display

VARIO

m/1s

0.0

m/3s

0.0

m/10s

0.0

ALT 0

RXSQ 0

MAX 0m

MIN 0m

If attached to the receiver, this screen will display the data acquired by a Vario module, Order No. 33601.

The displayed items are as follows:

Value Explanation

ALT current altitude

RXSQ Signal strength of the signal received

by the receiver in %, see page 209.

MAX the preset maximum altitude limit

relative to starting location at which, when exceeded, will cause an audible warning to be sounded

MIN the preset minimum altitude limit

relative to the starting location at which, when underrun, will cause an audible warning to be sounded

m/1 s m/1 s ascent/decent rate

m/3 s m/3 s ascent/decent rate

m/10 s m/10 s ascent/decent rate

Transmitter description - Telemetry data display

ELECTRIC AIR MODULE

0.0V 0A ALT 0m

BAT1 0m/1s

0.0V 0m/3s

T1 0°C

BAT2

0.0V T2 0°C

0.0V 0A ALT 0m

BAT1 0m/1s

0.0V 0m/3s

T1 0°C

BAT2

0.0V T2 0°C

1L0.00 2L0.00 3L0.00 4L0.00 5L0.00 6L0.00 7L0.00

1H0.00 2H0.00 3H0.00 4H0.00 5H0.00 6H0.00 7H0.00

If attached to the receiver, this screen will display the data acquired by an Electric-Air module, Order No. 33620. More details about this module can be found in the appendix or in Internet at www.graupner.de in the web page for the given product.

Depending on how this module is equipped with sensors, this screen can permanently display the data shown in the adjacent table.

The current voltage of up to two batteries (BAT1 and BAT2), up to two temperature measurements (T1 and T2), current altitude with respect to the starting location, the model's ascent/decent rate in m/1 s and m/3 s and, in the middle of the screen, the current draw currently being taken from a power source.

Along the right edge of the screen is a table of alternating values for cell voltages at balancer connections (L) or voltages for up to 7 attached battery cell packs (H).

The displayed items are as follows:

Value Explanation

V current voltage

A current current

BAT1 / BAT2 battery 1 or 2

ALT current altitude

m/1 s m/1 s ascent/decent rate

m/3 s m/3 s ascent/decent rate

T1 / T2 temperature of sensor 1 or 2

L or H cell voltage of cells 1 … 14 (14 max)

L = balancer connection 1 H = balancer connection 2

GENERAL MODULE

CELL V

BAT1

BAT2

BAT1

BAT2

E FUEL F

0.0V

T1 0°C

0.0V T2 0°C

E FUEL F

0.0V

T1 0°C

0.0V T2 0°C

1:0.00 2:0.00

3:0.00 4:0.00 5:0.00

6:0.00

ALT

0m1

0m3

POWER

0.0V

0.0A 0

If attached to the receiver, this screen will display the data acquired by a General-Engine module, Order No. 33601, or a General-Air module, Order No. 33611. More details about these modules can be found in the

appendix or in Internet at www.graupner.de in the web page for the given product.

Depending on how this module is equipped with sensors, this screen can permanently display the data shown in the table below.

The current voltage of up to two batteries (BAT1 and BAT2), the measurement results of up to two temperature sensors (T1 and T2) and a ﬁ ll level gage for the fuel tank.

An alternating display along the screen's right edge will display a list of current cell voltages for a LiPo battery with up to six cells or operational data (current altitude with respect to the starting location, ascent/decent m/1 s and m/3 s, current current being drawn in amperes and current voltage of the battery connected to the sensor).

The displayed items are as follows:

Value Explanation

BAT1 / BAT2 battery 1 or 2

FUEL fuel level / tank gage

E / F empty / full

T1 / T2 temperature of sensor 1 or 2

CELL V voltage of cells 1 … 6 (6 max)

ALT current altitude

0m1 m/1 s ascent/decent rate

0m3 m/3 s ascent/decent rate

A current draw i amperes

V battery voltage

Transmitter description - Telemetry data display

Warning notices

BIND N/A

Please select

RF on/off?

OFF

battery needs charging

Fail Safe setup t.b.d.

MISSING

IMPORT

DATA

Throttle

too

high !

"Bind not available" A receiver has not yet been

bound to the currently active model memory. Brieﬂ y touching

SET key will cause a direct

the jump to the appropriate option.

Please select RF transmission "ON" or "OFF".

Operating voltage is too low

Failsafe has not yet been activated

A suitable language ﬁ le cannot be found on the memory card

Helicopter throttle joystick or limiter too high

CAN‘T

RECEIVE

DATA

No pupil signal

SD-CARD

INSERT

No bound receiver in range

Connection between teacher and pupil is interrupted

No SD or SDHC memory card in the card slot or card is not legible

Is the "wireless teacher/pupil connection" that was • active when the transmitter was last used to be continued, CONT or switched off OFF?

TRAINER

Wireless Link

ACT INH

After being switched on, the transmitter has not • been used within the time limit preset in the "Poweron beep" line of the "Basic Settings" menu, see page 227. The message …

Power on waning

is active!

not possible now voltage too low

MUST BE

OFF

Transmitter description - Warning notices

Prompt to switch off RF transmission

(language ﬁ le can only be loaded when RF is switched off)

… will appear in the screen, the center LED will alternately blink red and blue and an acoustic warning tone will sound.

If the transmitter continues unused it will autonomously switch itself off after one minute.

When battery voltage is too low, a model change is • blocked for reasons of safety. The screen will show an appropriate message.

Function ﬁ elds in the display

SEL, STO, SYM, ASY, , Depending on the given menu, certain function ﬁ elds will

appear on the bottom display line.

CLR SEL STO SYM ASY

A marked function is activated by tapping on the SET key.

Function ﬁ elds

CLR• (clear) delete SEL• (select): selection STO• (store): store (e. g. control position) SYM• set values symmetrically ASY• set values asymmetrically

• switch symbol ﬁ eld (assignment of all types of switches)

• within a menu, change to the

second page (menu continuation)

Position indicator

Proportional controls, CTRL 7 and 8 As soon as one of the proportional controls (CTRL 7 & 8)

in the middle console is turned, a small symbol will appear to the left of the two vertical position indicators.

At the same time, for the duration of the control's operation, the position indicator for the two vertical bars in the middle will change from displaying current trim position to a display of the respective current position of the proportional controls CTRL 7 & 8.

Logically, the left proportional control (CTRL 7) is displayed by the left bar indicator and the right bar indicator displays the position of the right proportional control (CTRL 8). The two horizontal bars continue to show current trim positions of respective joystick trim controls.

GRAUBELE

#01

5.2V

3:33h

Stop Flt

K78

0:00 0:00

HoTT

RX0.0V

Entry lockout

The touch keys can be locked out to prevent unintended access and operation of settings. This lockout is established (when the mx-20 HoTT transmitter is displaying its base screen) by simultaneously pressing and holding both the seconds. This lockout condition is indicated by a key symbol, located at the intersection point of the trim bars, which is displayed in reverse video.

GRAUBELE

#01

3:33h

The lockout is effective immediately but controls remains operationally ready.

The lockout can be removed by again touching and holding the ESC and SET keys for about two seconds. A lockout condition is also removed the next time the transmitter is switched on.

ESC and SET keys for about two

Stop Flt

«normal »

5.2V

K78

0:00 0:00

HoTT

5.5V

About 2 seconds after operating one of the proportional controls has ended, the display will again revert to display of current trim positions of the four trim controls generated by the two joysticks.

Transmitter description - Function ﬁ elds, position indicator and entry lockout

Putting the transmitter into operation

Preliminary remarks about the mx-20 HoTT transmitter

Preliminary remarks

Graupner's HoTT system theoretically permits simultaneous operation of more than 200 models. However, because of the interspersed radio-frequency utilization permitted by certiﬁ cation for the 2.4 GHz ISM band, this number is signiﬁ cantly lower in practical application. Nevertheless, in general more models can be operated simultaneously in the 2.4 GHz band than would be the case in conventional 35 or 40 MHz frequency bands. The real limiting factor is – as often before – is still likely to be the size of available operating space (i.e. airspace for aircraft). Alone the fact that it is no longer necessary to coordinate transmitting frequencies with other pilots in the vicinity (which is sometimes quite difﬁ cult in broken landscapes, such as on hillside slopes) represents an enormous boost for remote control operating security.

Battery charged?

Since the transmitter is delivered with an empty (not charged) battery, the battery must ﬁ rst be charged according to the charging instructions on page 14. Otherwise a warning tone will be sounded when the low voltage threshold, preset in the "Batterie warning" line of the "Basic Settings", is underrun. This low voltage threshold can be set, as described on page 226. When this threshold is underrun, a warning tone will be sounded and an appropriate message will be overlaid on the base screen.

Transmitter startup

After being switched on, the message shown below will appear in the transmitter's screen for about two seconds.

battery needs charging

Please select

RF on/off?

OFF

Within this brief period you may be able to switch off RF transmission by using the  or  key of the right touch pad to shift the query's response from "ON" to "OFF" such that the ON option is displayed in normal video and the OFF option is highlighted in reverse video.

Please select

RF on/off?

OFF

Now switch the RF module off by tapping on the center

SET key in the right key pad.

The center LED, which in the meantime has been illuminating in blue, will change its color to red again and the transmitter's display will show the screen depicted below.

GRAUBELE

#01

5.2V

0:33h

The symbol combination means that the currently active model memory has already "bonded" with a Graupner HoTT receiver in the past but there is no connection to this receiver at the moment. (In this example, RF transmission has been switched off.)

If the transmitter were to be switched on without switching off RF transmission, the center LED would illuminate in blue and the symbolic transmitter antenna

Stop Flt

K78

0:00 0:00

HoTT

0.0V

in the screen would blink. At the same time, an acoustic warning will sound until a connection is established with the respective receiver. As soon as this connection is established, the "x" at the base of the antenna symbol will be replaced by a ﬁ eld strength indicator, for example

, and the optical and acoustic warnings will stop.

If a telemetry connection has also been established for the incoming signal, that is output by the receiver in the model, then the right side of this same screen line will display a similar indication of signal strength for this reception of the receiver's transmitted signal (>M ) as well as the current voltage of the receiver's power supply.

On the other hand, if the screen displays the symbol combination and the center LED illuminates in red continuously then the currently active model memory is not "bonded" to any receiver.

Under-voltage warning

If transmitter voltage drops below the adjustable threshold speciﬁ ed in the "General Settings" menu, see page 226 (default value, 4.7 V), an optical and an acoustic under-voltage warning will be issued.

Important notices:

The transmitter in the set is already preset, as • delivered, with default values which are correct for operation in most European countries (except France).

If the remote control system is to be operated in France then the transmitter MUST be changed over to "FRANCE" mode, see page 227. IN NO CASE may the Universal/EUROPE mode be used IN FRANCE.

The receiver included in the set • with the mx-20 HoTT 2.4 transmitter (and already bound to the transmitter by settings made in the factory) is

Putting the transmitter into operation

Transmitter ﬁ rmware updates

capable of operating up to 12 servos.

In order to achieve the greatest possible ﬂ exibility but still preclude unnecessary inadvertent operator errors, control channels 5 … 12 have not been assigned to any controls. This means that servos connected by way of these channels will remain in their middle positions until an operator element has been assigned. Practically all mixers are initially inactive for this same reason. More about this can be found on page 96 (winged aircraft) or 100 (helicopter models).

The fundamental procedure for initial • programming of a new model memory location can be found on page 60 and the programming examples that begin on page 236.

When the remote control system is switched on, • being bonded or when making settings, that the transmitter's antenna is always far enough away from the receiver's antennas. If the transmitter's antenna is brought too close to the receiver's antennas this will cause receiver over-modulation and its red LED will illuminate. At the same time the return channel will drop out and, as a consequence, the ﬁ eld strength indicator in the transmitter's screen will be replaced by an "x" and the receiver's current battery voltage display will show 0.0 V. The remote control is then in Fail-Save mode, see page 196, i. e. when signal reception drops out all servos will remain in their current positions until a valid signal is again received.

In such a case, increase the distance (between the transmitter and the model containing the receiver) until the indicators are again "normal".

Transmitter ﬁ rmware updates are made at one's own risk by connecting the ﬁ ve-pole mini-USB connector on the rear side of the transmitter to a PC running Windows XP, Vista or Windows 7.

Current software and information is available in Internet at www.graupner.de under the download link for the given product.

Notice: You will automatically be notiﬁ ed of new updates per email after registering your transmitter at https://www.graupner.de/de/service/produktregistrierung.

The USB cable delivered with the USB interface option, Order No.7168.6, is also needed to make an update. This cable's connector is plugged directly into the 5-pole mini-USB connector socket on the rear side of the transmitter

Updating mx-20 HoTT software

Notice: Be sure to check the charge status of your transmitter's battery or charge its battery as a precaution before every update. Also backup all occupied model memories so they can be restored if that should become necessary.

1. Installing drivers

Install the required driver software, included in the "USB Drivers" folder of the program packet, onto your PC or laptop so your computer can handle the transmitter's integrated USB interface.

Start driver installation with a double-click on the respective ﬁ le and follow the on-screen instructions. Once this software has been successfully installed, the computer must be re-started. Drivers only need

to be installed once.

Installing the software up-loader2.

Unpack ﬁ le "Radio_grStudio_Install_VerXX.zip" and start the actual installation program "Radio_ grStudio_Install_VerXX.msi" with a double-click then follow the instructions.

This program is installed by default under "Start\ Programs\Graupner\ Radio_grStudio\Radio_ grStudio_Ver-SX.X".

Establishing a transmitter-to-PC connection3.

With the transmitter switched off, connect the USB cable by way of its 5-pole mini-USB socket to the rear side of the transmitter.

Updating 4. mx-20 HoTT transmitter software

Start the "Radio_grStudio_Ver-SX.X" program from the respective folder, by default at "Start\Programs\ Graupner\ Radio_grStudio\Radio_grStudio_VerSX.X".

Use the selection sequence "Menu", "Port Setup" or open the "Controller Menu" and click on "Port select".

Putting the transmitter into operation

Now in the "Port select" window, select the COM port connected to the USB interface. The correct port can be recognized by its designation "Silicon Labs CP210x USB to UART Bridge" in the "Device Name" column. In the above example this would be the "COM 3" port.

Now call up menu option "Firmware Upgrade" from "Menu" or open the "Controller Menu" and click on "Firmware Upgrade".

the desired ﬁ rmware update ﬁ le with a ".bin" ﬁ lename extension from the "Open ﬁ le" window.

Firmware ﬁ les are product-speciﬁ cally coded, i. e. if you should accidentally select a ﬁ le which does not correspond to the product (e. g. receiver update ﬁ le instead of a transmitter update ﬁ le), the "Product code error" popup window will appear and the block the update process from starting.

Now switch on the transmitter then start the transmitter update by clicking on the "Download Start" button.

After a brief period a warning will appear stating that the transmitter's RF transmission will now be interrupted and that, because of this, any receiver system currently in operation should be switched off. Switch off your receiver system if it is switched on then click on "Yes".

Do not terminate the update process before the progress bar has reached its right end and the "Firmware Download Success" message appears.

Click on the button labeled "File Browse" and select

Putting the transmitter into operation

This will start the actual update process. A progress bar will begin to operate above a sequence of running text lines.

Click on "OK". Subsequently switch off the transmitter and disconnect the USB cable between the transmitter and the PC or Laptop.

If the progress bar hangs up without showing any further progress, close the program and repeat the update process. Be sure to watch for any error messages that may appear.

Your notes

Receiver initialization

Preliminary remarks about the GR-24 receiver

Receiver system

The mx-20 HoTT remote control set includes a type GR-24, 2.4 GHz bidirectional receiver for connecting up to 12 servos.

After switching on this HoTT receiver, should "its" transmitter not be within range or switched off, then the receiver's red LED will illuminate continuously for about 1 s then begin to blink slowly. This indicates the receiver has not (yet) established a link to a Graupner HoTT transmitter. If a link has been established, the green LED will illuminate continuously and the red LED will extinguish.

In order to establish a link to the transmitter, the Graupner HoTT receiver must ﬁ rst be "bound" to "its" particular model memory in "its" Graupner HoTT transmitter. This procedure is known as "binding". This "binding" linkage is only necessary once for each receiver/model memory combination. Refer to pages 69 or 74. The "binding" procedure has been done at the factory for model memory 1 of the units delivered together as a set so this "binding" procedure will only be necessary to link additional receivers or if a memory location change becomes necessary (and – e. g. after a change of transmitter – can be repeated anytime).

On-board voltage display

The current voltage of the receiver's power supply will be shown in the right side of the transmitter's screen if a telemetry link exists between the receiver and transmitter.

Temperature warning

Should the receiver's temperature sink below an adjustable threshold (default value -10 °C) or rise above an adjustable threshold (default value +55 °C),

Putting the transmitter into operation

an acoustic warning will be issued by the transmitter in the form of a uniform beep of about 1 s duration. The aforementioned threshold limits are stored and adjusted in the receiver.

Servo connections and polarity

Graupner HoTT receiver servo connections are numbered. The connectors used are keyed against polarity reversal. Pay attention to the small side proﬁ les when plugging in these connectors. Never use force.

The two outer connections, having designations "11+B-" and "12+B-" are intended for the battery connections. These two connections plus the servo's respective connections can be combined into a single connector at each end by way of a V or Y cable, Order No. 3936.11.

Do not reverse the polarity of this connection. Reversed polarity could destroy the receiver and devices attached to it.

The supply voltage is bussed across (i.e. common for) all numbered connections. The function of every individual channel is determined by the transmitter used, not by the receiver. It is not only the throttle servo connection which is different for every manufacturer and model type. For example, in Graupner remote control systems the throttle servo is on channel 1 for winged aircraft and on channel 6 for helicopter models.

Concluding notices:

The signiﬁ cantly greater servo resolution • characteristic of the HoTT system produces a noticeably ﬁ rmer response behavior in comparison to previous technology. Please take the time to familiarize yourself with this sensitive behavior.

If you have a speed controller with integrated BEC* • arranged in parallel with the receiver battery, its

positive pole (red cable) may to be removed from the 3-pole connector. Be sure to look for notices about this in the instructions for the speed controller used.

Use a small screwdriver to carefully lift the connector's middle latch slightly (1), pull on the red wire to remove its connector pin from the connector (2) then put insulation tape around the removed con-

red

nector pin to prevent possible short circuit conditions (3).

Follow the installation instructions on page 46 for the receiver, the receiver antenna and for mounting the servo.

Reset

To execute a reset of the receiver, press and hold the

SET button on the receiver's top-side while switching the

power supply on. Once power is on, release the button again.

If a receiver reset is done while the transmitter is switched off or on a receiver which is not bound, the receiver's LED will slowly blink red for about 2 or 3 seconds and then a binding procedure can be started right away on the transmitter.

If reset is done on a bound receiver and the corresponding model memory is active in the powered on transmitter, the LED will illuminate in green after a brief period as an indication that your transmitter/ receiver system is again ready for operation.

* Battery Elimination Circuit

Receiver ﬁ rmware updates

Please note the following:

A receiver RESET will cause ALL receiver settings

- except for binding information - to return to their

factory settings.

Therefore if a RESET is triggered unintentionally, any custom settings that had been present in the receiver before the reset will have to be established again by way of the Telemetry menu.

A deliberate RESET is recommended, especially if a receiver is to be "transferred" into another model. This is a rather simple method to eliminate settings which are no longer applicable.

Receiver ﬁ rmware updates are made by way of the connector located on the side of the receiver and the help of a PC running under Windows XP, Vista or Windows 7. The optional USB interface cable needed for this is Order No. 7168.6 along with adapter cable, Order No. 7168.6A. The programs and ﬁ les also needed can be found in Internet on the Graupner website at www.graupner.de under the downloads for the particular product.

Notice: After registering your receiver at https://www.graupner. de/de/service/produktregistrierung, you will automatically receive notiﬁ cation of future updates per email.

Updating receiver ﬁ rmware

Notice: Before any update procedure, be sure to check the charged status of the receiver's battery. If necessary, charge the battery before beginning with an update.

Installing drivers1.

If not already done, install the required driver software for the USB interface, Order No. 7168.6, as described on page 39.

Establishing a receiver / PC connection2.

Connect the USB interface cable, Order No. 7168.6, via the adapter cable, Order No. 7168.6A, with the "- + T" connector on the receiver. These connectors are protected against polarity reversal so pay attention to the small proﬁ les on the sides of connectors. Do not use brute force, these connectors should latch in rather easily.

Adapter lead Order No. 7168.6A

If a central red wire is present, cut through it.

Attention: If the adapter cable is still has wires for all three poles, cut the red insulated wire for the middle connector pin of the adapter cable, Order No. 7168.6A.

Afterward, make the USB interface connection to the PC or laptop by way of the delivered USB interface cable (PC USB/mini-USB). If the USB interface is connect properly, a red LED on the interface board should illuminate for a few seconds.

If not already off, now switch the receiver off.

Firmware update utility program3.

On the PC, start the "Graupner_Firmware_Update_ Utility_VerX.XX.exe" program with a double-click. This program is located among the ﬁ les in the "Firmware-Updater" folder. (At the time of printing for this manual, this program's current version is 1.18 and it can be started without ﬁ rst being installed.)

Putting the transmitter into operation

Typically this ﬁ le can be found in the folder whose name is preﬁ xed with the order number of the receiver to be updated. This folder should contain the ZIP ﬁ le that was downloaded and unpacked. Its ﬁ lename should also be preﬁ xed with the order number of the receiver to be updated. For the standard GR-12 receiver included in this set, the folder would be designated "33512_12CH_RX". The ﬁ lename will appear in the corresponding window.

In the "COM Port Setup" group box, select the COM port to which the USB interface is connected. If you are not sure which selection is correct, press the "Search" control, choose the connection labeled "Silicon Labs CP210x USB to UART Bridge" from the popup window and then activate "OK". The "Baud Rate" setting should be "19200".

Afterwards, click on the "Signal 2:Vcc3:Gnd" radio button in the "Interface Type" group box.

Now click on the control labeled "Browse" that is located at the top right corner of the window. From the "Open ﬁ le" window which appears, select the appropriate ﬁ rmware update ﬁ le for your receiver. Such ﬁ les always have the ".bin" ﬁ lename extension.

Putting the transmitter into operation

Firmware ﬁ les are product-speciﬁ cally coded, i. e. if you should accidentally select a ﬁ le which does not correspond to the product (e. g. transmitter update ﬁ le instead of a receiver update ﬁ le), the "Product code error" popup window will appear and the block the update process from starting.

Activate the control labeled "Program". Wait for the progress bar to start. Depending on the speed of the computer being used, this may take several seconds. Now press and hold the receiver's SET button while switching on the receiver's power supply. After a few seconds the "Found target device …" message will appear in the status display. Now you can release the receiver's button. The actual ﬁ rmware update will begin autonomously after this message has appeared.

However, if the receiver is not detected, the "Target device ID not found" popup window will appear.

If this process terminates before reaching the 100 % mark, switch off your receiver's power supply then try to start the update process all over again. Do this by performing the above steps again.

The status display and progress bar will show you the progress of the ﬁ rmware update. The update is concluded when the text "Complete … 100 %" or "Complete!!" appears in the bottom line of the status display.

Both LEDs on the receiver will illuminate during the update process. Upon successful conclusion of the update process, the green LED will extinguish and the red LED will begin to blink.

Switch off the receiver, remove the interface cable and repeat the process for any other receivers you have which must be updated.

Receiver initialization4.

Following a successful update process you MUST perform a receiver initialization procedure before using the receiver again. This is necessary for reasons of safety.

Do this by pressing and holding the receiver's SET button then switching the receiver's power supply on. Now release the SET button again. When you subsequently switch the receiver on again, the receiver's green LED will illuminate continuously for about 2 or 3 seconds. Except for binding information, all other settings that may have been programmed into the receiver will now be reset to factory defaults and will have to be re-entered again if they are needed.

Putting the transmitter into operation

Installation notices

Receiver installation

Regardless of which Graupner receiver system you use, the procedure is always the same.

Please pay attention that the receiver's antennas must be mounted at least 5 cm away from all large metal parts or any wiring that is not directly routed out of the receiver itself. In addition to steel parts, this also includes carbon ﬁ ber parts, servos, fuel pumps and all kinds of cables etc. Optimally the receiver should be placed at a readily accessible location that is well away from all other equipment. Under no circumstances may servo cables be wrapped around the antennas or routed close to it.

Please note that cables are subject to the acceleration forces which occur during ﬂ ight and these forces may cause such cables, to shift in position. Therefore be sure the cables in the vicinity of the antennas are not able to move. Such moving cables can cause reception disturbances.

Tests have shown that vertical (upright) antennas provide the best results during wide-range ﬂ ights. In the case of diversity antennas (two antennas), the second antenna should be oriented at a 90° angle to the ﬁ rst antenna.

The GR-24 HoTT receiver connections designated "11+B" and "12+B" are intended for battery connections. If necessary, an addition battery connection for a servo can be made if a V or Y cable is used, Order No. 3936.11. The power supply is bussed across all numbered connections so it can be attached at any of these 12 connectors. However, due to additional voltage losses associated with the traverse connectors, connections 8, 9 and 10 should not be used for connecting the receiver's battery.

The function of every individual channel is determined by the transmitter used, not by the receiver. However, channel assignments can be changed in the receiver by programming done in the "Telemetry" menu. Nevertheless, it is recommended this be done on the transmitter side via the "Transmitter output" option, see page 206.

Several notices and suggestions for installing remote control components into a model are provided below.

Wrap the receiver in a foam rubber pad that is at 1. least 6 mm thick. Attach the foam rubber to the receiver with rubber bands so it will be protected against vibration and/or the jars of a hard landing.

All switches must be installed such that they are not 2. affected by exhaust gasses or vibration. The switch knob must be freely accessible over its entire range of movement.

Mount servos on rubber bushes/spacers with hollow 3. brass bearings to protect them from vibration. Do not tighten the fastening screws down too tight as this would negate the vibration protection to be provided by the rubber bush/spacer. Only when servo fastening screws are properly tightened will this arrangement provide security and vibration protection for your servos. The ﬁ gure below shows how a servo is mounted properly. The brass bearings are to be pushed into the rubber bushes/spacers from below.

Servo mounting lug

Retaining screw

Rubber grommet

Tubular brass spacer

Servo arms must be free to move throughout their 4. entire range of motion. Pay attention that there are no objects which could hinder servo arm motion.

The sequence in which servos are connected to the receiver depends on the type of model. Follow the connection layouts provided for this on pages 57 and 59.

Also observe the safety notices provided on pages 4 … 9. In order to prevent uncontrolled movements of servos

connected to the receiver during startup

always ﬁ rst switch on the transmitter

and then the receiver

and when ﬁ nished with operation

ﬁ rst switch off the receiver

and then the transmitter.

When programming the transmitter, be sure that electric motors cannot start running without control or that a combustion motor equipped with automatic starting cannot start up unintentionally. To be safe, disconnect the receiver's drive battery or, in the case of a combustion motor, disconnect the fuel supply.

Installation notices

Receiver system power supply

Among other aspects, the safe operation of a model depends on a reliable power supply. In the event that, despite smooth operating rods, fully charged battery, battery leads with adequate cross-section, minimum contact resistances at connectors, etc., the transmitter indicates repeated receiver voltage collapses or is receiver voltage is generally too low; please give attention to the following notices.

Give primary attention to fully charged batteries when model operation is to be started. Be sure that the contact surfaces of connectors and switches really are low resistance. If necessary, measure the voltage drop across installed switch cables when they are under load because even new heavy-duty switches can cause a voltage drop of up to 0.2 V. This value can increase in contacts by factors as a consequence of aging and oxidation. The constant vibrations and jarring also takes its toll on contacts to produce a creeping increase of contact resistance.

Servos present another possible problem source. Even rather small servos like a Graupner/JR DS-281 can draw up to 0.75 A of current when it is blocks under load. Just four of these servos in a "foam" model can therefore load down the on-board power supply by as much as 3 A …

Therefore you should choose a power supply which will not break down under greater loads but rather always deliver sufﬁ cient voltage. To "calculate" necessary battery capacity you should always ﬁ gure on at least 350 mAh for every analog servo and at least 500 mAh for every digital servo.

For example, from this point of view a battery with 1400 mAh would be the absolute minimum to power a receiver system with a total of 4 analog servos. But be sure to also consider the receiver itself into the

calculation because its bidirectional functionality will draw about 70 mA of current too.

It is also a good practice to connect the receiver to its power source with two cables rather than just one. Cable "1" could be connected to the "12+B" receiver connector as is usual and cable "2" could be connected to the opposite end of the row at the connector labeled "11+B". For example by using two power supply cables to connect one switch or voltage regulator to the receiver. Just use a V or Y cable, Order No. 3936.11 to accomplish this (see ﬁ gure) if you should need one or both of the receiver's connectors to attach a servo, speed controller, etc. This double-connection technique to switches and speed controllers not only reduces the risk of a cable break but also ensures a more uniform supply of power to the connected servo.

Aux. function

Y-lead Order No. 3936.11

PRX stabilised receiver power supply Order No. 4136

NiMH 4-cell battery packs

In compliance with the aforementioned conditions, your Graupner HoTT receiver system can be readily operated with traditional 4-cell battery packs as long as the packs have adequate capacity and voltage level.

NiMH 5-cell battery packs

Five-cell battery packs offer a greater voltage tolerance than do 4-cell packs.

However, be aware that not every servo available on

the market is able to tolerate the voltage level output by a 5-cell pack over the long term, this is particularly true when the battery pack is freshly charged. Some of these servos react to this with a noticeable "grinding" sound.

Therefore pay attention to the speciﬁ cations of the servos you use before making a choice for a 5-cell battery pack..

LiFe 6.6 V batteries with 2 cells

From a contemporary perspective, these new cells are the very best choice.

LiFe cells are also available in hard plastic casings to protect them from mechanical damage. Like LiPo cells, LiFe cells can be quick charged in suitable chargers and they are comparatively robust.

This type of secondary cell battery is also rated for a signiﬁ cantly greater number of charge/discharge cycles than, for example, LiPo batteries The nominal 6.6 V output of a 2-cell LiFe battery pack does not present a problem for either Graupner HoTT receivers nor for those servos, speed controllers, gyros and other devices which have been speciﬁ cally approved for operation in this – higher – voltage range. Please note however

that practically all servos, speed controllers, gyros and other devices built in the past and most such devices currently still offered on the market have only a permissible voltage range of 4.8 to 6 V. Use

of these batteries in conjunction with these devices demand use of a stabilized voltage regulator, e. g. the PRX, Order No. 4136, see appendix. Otherwise there is danger that attached devices will incur damage within a short period of time.

LiPo 2-cell packs

For a given capacity, LiPo batteries are lighter than,

Installation notices

for example, NiMH batteries. LiPo batteries are also available in hard plastic casings to protect them from mechanical damage.

The comparatively high nominal voltage, 7.4 V, for a 2-cell LiPo pack does not present a problem for either Graupner HoTT receivers nor for those servos, speed controllers, gyros and other devices which have been speciﬁ cally approved for operation in this – higher – voltage range. Please note however that practically

all servos, speed controllers, gyros and other devices built in the past and most such devices currently still offered on the market have only a permissible voltage range of 4.8 to 6 V. Use of these

batteries in conjunction with these devices demand use of a stabilized voltage regulator, e. g. the PRX, Order No. 4136, see appendix. Otherwise there is danger that attached devices will incur damage within a short period of time.

Installation notices

Your notes

Term deﬁ nitions

Control function, control, function input, control channel, mixer, switch, control switch, ﬁ xed switch

To make use of this mx-20 HoTT manual easier, a number of the terms used repeatedly throughout this manual have been deﬁ ned below.

Control function

A "control function" is a signal intended to affect a given control action – initially independent of its signal course in the – . For example, this could be for throttle, ruder or aileron in a winged aircraft or pitch, roll or crow for a helicopter. A control function signal can be applied directly over a single control channel or also through a mixer and then applied over multiple control channels. A typical example of multiple control channels is separately operated aileron servos or the use of two roll or crow servos in helicopters. The control function explicitly includes the inﬂ uence of the control's mechanical travel on the respective servo.

Control

"Controls" include all operating elements on the transmitter, which are directly activated by the pilot, that impose an effect on servos, speed controllers etc. connected to the receiver. This includes:

both joysticks (control functions 1 through 4), even • though these four control functions can be freely swapped around for both model types ("winged aircraft" and "helicopters") by use of software "Mode" settings, e. g. throttle left or right. The dual-axis function for throttle/airbrake is often referred to as the C1 control (channel 1).

the three • proportional rotary controls, which are CTRL 6, 7 + 8,

the switches, SW 4/5 and 6/7, which are CTRL 9 and 10,• switches SW 1 … 3 as well as 8 and 9, if assigned to •

a control channel via the "Transm. controls" menu.

Term deﬁ nitions

The proportional operating elements produce a direct effect on servos which is commensurate with the control's position whereas switch modules can only effect a two or three increment change.

Function input

This is an imaginary point in the signal path and must not be considered the same as the point on the circuit board where the transmitter control is connected. The choice of "controls arrangement" and settings in the "Transm. controls" menu have their effect "downstream" of this imaginary point of connection. Thus differences between the physical control's number and the number of the downstream control channel can indeed emerge.

Control channel

From the point at which a signal contains all control information necessary for a particular servo – whether directly from the physical control or indirectly by way of a mixer – the term "control channel" is used. This signal is only yet to be inﬂ uenced by settings made in the "Servo adjustment" menu and the "Transmitter output" menu before it leaves the transmitter's RF module.

Once it arrives at the receiver, this signal may still be modiﬁ ed by settings made in the telemetry menu before ﬁ nally being applied as a control quantity for the respective servo.

Mixers

The transmitter's software contains diverse mixer functions. These can be used to apply one control function to multiple servos or, conversely, to apply multiple control functions to a single servo. Please look over the numerous mixer functions in the text beginning on page 145 of this manual.

Switches

The three standard 2-position switches, SW 2, 3 and 8, the two 3-position switches, SW 4/5 and 6/7, as well as both pushbutton switches, SW 1 and 9, can also be combined with control programming. However, these switches are generally intended for switching program options, e. g. to start and stop timers, to switch mixers on and off, or as a teacher/pupil switchover, etc. Each of these switches can be assigned any number of functions.

Appropriate examples are detailed in the manual.

Control switches

Since it is very practical to have some functions automatically switched on or off for a certain control's position (e. g. switch on/off of a stopwatch for acquisition of model run time, automatic extension of spoilers and other possibilities), four control switches have been integrated into mx-20 HoTT software.

These software switches, designated "G1 … G4", are triggered by setting a switch-point along the physical control's course of travel. This "trigger setting" is simply deﬁ ned with the press of a button. The switching action can be correlated to the physical control's travel direction by software. Of course control switches can also be freely combined with the aforementioned physical switches to solve even more complex problems.

There is a series of instructive examples which make this programming child's play. Learn about this by taking advantage of the programming examples beginning on page 226.

Fixed switches FXI and FX

This type of switch turns a function permanently on, e. b. timers (closed ﬁ xed switch) or off (open ﬁ xed switch) or they can provide a ﬁ xed input signal for a control function, e. g. FXI = + 100 % and FX For example, in ﬂ ight phase programming, these ﬁ xed switches can be used to switch a servo or speed controller between two settings.

= -100 %.

Term deﬁ nitions

Physical control, switch and control switch assignments

Principle procedure

The mx-20 Hott system exhibits maximum ﬂ exibility when it comes to assigning standard equipment operating elements to speciﬁ c functions.

Since the assignment of controls and switches is done in the same way, even though different menus may be involved, it is appropriate at this point to explain the fundamental programming technique so that users can concentrate on the particular contents when reading the detailed menu descriptions.

Physical control and switch assignments

The "Control adjust" menu can be used to assign transmitter inputs 5 … 12 to operate servos, both from any given joystick direction (K1 … K4) as well as to assign any other physical control designated "CTRL" or switch designated "SW". After tapping on the center

SET key in the right key pad, the screen shown below

will appear.

Move desired switch

or control adj.

Now simply activate the desired control (joystick 1 … 4, CTRL 6 … 10 or switch 1 … 3, 8 or 9).

Notice: Rotary controls, CTRL 6 … 8, will not be recognized until they "detent". Therefore these controls can be turned back and forth until the correct assignment is shown in the screen. If adjustment travel is insufﬁ cient, activate the control in the other direction.

On the other hand, if you wish to assign a control in the "Control switch" menu, page 119, the "activate desired control" message will appear.

Physical control, switch and control switch assignments

push desired switch into position ON

Important notice: Controls to be assigned (particularly CON TROL 6 …

10) MUST be pre-assigned in the "Control adjust" menu to one of the inputs 5 through 12!

Control assignment

Wherever programming permits a switch to be assigned, a switch symbol will appear in the screen's bottom display line.

Use the arrow keys in the left or right touch pad to select the appropriate column.

How to assign a switch

Brieﬂ y press the 1. SET-T key in the right touch pad. The message shown below will appear in the screen.

Move desired switch to ON position (ext. switch: SET )

Now it is only necessary to put the selected switch 2. into the desired "ON" position or, as described at the right in "Assignment of external switches", to select a switch from the list of "External switches". This concludes the assignment. The switch symbol to the right of the switch's number indicates the current state of the particular switch.

Since CTRL 9 and 10 as well as the 3-position switches, SW 4/5 and 6/7, are not only usable as controls but also function as pure switches, there is a total of 9 switches ("SW 1 … 9") available for use as desired.

Changing switch action

If the activation of a switch is to result in the opposite action, put the switch or joystick in the desired OFF position, again activate the switch assignment and reassign the switch again so it will respond with the desired action.

Clear switch

A switch which has been assigned as described under point 1 can be cleared by simultaneously pressing the  or  key combination brieﬂ y in the right key pad (CLEAR).

Assignment from the "external switch" list

Those menus in which the message …

Move desired switch to ON position (ext. switch: SET )

… appears for switches designated with "SW" can be used to assign so-called "external switches.

Do this by conﬁ rming the message text with the SET key. A new window will appear with a list of the four control switches "C1 … C4", followed by two so-called "FX" ﬁ xed switches and the four inverted switches "C1i... C4i".

Control/fix sw

C1 C2 C3 C4 FX

FXi C1i C2i C3i C4i

Use the arrow keys in the left or right key pad to select the desired switch then assign it with a brief tap on the center SET key of the right touch pad.

Notices:

The two FX switches turn a function on "FXI" or off • "FX " permanently.

All other switches mentioned can have multiple • assignments. Pay attention that you do not UNINTENTIONALLY assign reciprocally conﬂ icting functions to a single switch. If necessary, note down the given switch functions.

Application examples:

Shut-off of an on-board glow plug heater upon • underrun or overrun of an idle threshold point programmed for the C1 joystick. In this case the glow plug heater switch is controlled by a transmitter mixer.

Automatic switch on/off of the timer to measure pure • "ﬂ ight time" for a helicopter by way of a control switch on the throttle limiter.

Automatic switch off of the "AI •  Rud" when brake ﬂ aps are extended, for example to adapt the roll of a model to the ground when making a landing on a slope without inducing a change of ﬂ ight direction due to inﬂ uence on the rudder.

Extending landing ﬂ aps with elevator trim adjustment • during a landing as soon as the throttle stick is moved beyond its switch point.

Switch on/off of the timer for measuring the operating • time of electric motors.

The control switches, freely programmable in the "Control switch" menu, can be incorporated into switch programming, i. e. assigned to a function instead of a "normal" switch. At those program locations where switches can be assigned you always have the opportunity to assign one of the control switches, C1... C4, instead of a physical switch by selecting one of these out of the list of "external switches".

Physical control, switch and control switch assignments

Digital trim

Functional description and description of C1 cut-off

Digital trim with visible and audible indicators

Both joysticks are equipped for digital trimming. When you give the trim lever a brief push (one "click"), the neutral position of the associated joystick channel changes by one increment. If you hold the trim lever in one direction, the trim value changes continuously in the corresponding direction with increasing speed.

These changes can be made "audible" by way of different frequency tones. This makes ﬁ nding the mid-point during ﬂ ight easy, without looking at the screen. When the midpoint is overrun, a brief pause will be inserted.

Current trim values are automatically stored when a model memory change is made. Furthermore, digital trim exercises ﬂ ight phase speciﬁ c control within a memory location (except for throttle/brake ﬂ aps trim) – the socalled "C1" (channel 1) control function –.

This C1 trim includes yet another special function for winged aircraft and helicopter models, it allows the carburetor's idle setting to easily be found for a combustion motor.

Since the trim functions described in these instructions are only effective in the direction "Motor off", the presentation in the screen of your transmitter may only change with respect to individual throttle or Pitch-min positioning of the C1 joystick in the "forward" or "back" direction, such as throttle/pitch "left stick" or "right stick". The illustrations in these instructions are always based on "Throttle/Pitch right" for both types of models and "Throttle back" for winged aircraft and helicopters.

Digital trim

1. Winged models

C1 trimming has a special cut-off trim function intended especially for combustion motors. This cut-off trim function is conﬁ gured as follows. First put the motor into a safe idle speed.

Now if you push C1 trim in a single motion toward its "Motor cut-off" direction until it is in its furthest travel position then an additional end-position marker will remain in the display. When the motor is restarted you can again immediately set the last idle speed with a single movement in the direction of "more gas".

Current trim position

GRAUBELE

#01

5.2V

3:33h

Stop Flt

K78

Current trim position

Ch 1 trim lever

0:00 0:00

2.4

RX0.0V

Trim at motor OFF position

This cut-off trim will be deactivated when "None" is entered on the "Motor at C1" line of the "Model Type" menu, see page 82.

Notice: Since this trim function is only effective in the "Motor off" direction, the display illustrated above will change appropriately if the C1 joystick's control direction for minimum throttle is changed from "back" to "front" (on which the above illustration is based) in the "Motor at C1" line of the "Basic Settings" menu.

2. Helicopter models

In addition to the "Cut-off trim" function described below in "Winged aircraft models", C1 trimming also has another characteristic which is made possible by combining it with a so-called "Throttle limit" function see page 104. As long as the throttle limit control remains in the "left" half of its travel path, i. e. in the startup range, C1 trimming acts on the throttle servo as idle trim and the indication for idle trim is visible in the screen's display.

Current trim position

GRAUBELE

#01

5.2V

3:33h

Idle direction

Last idle position

stop flt

K78

RX0.0V

Trim at

motor OFF position

Throttle limit control

0:00 0:00

2.4

CTRL 6

However, in contrast to winged aircraft models, the position indicator ( ) will be hidden and any preset idle position will be deleted when the throttle limit control is in the "right" half of its travel path.

GRAUBELE

#01

5.2V

3:33h

Stop Flt

K78

0:00

Throttle limit control

0:00

RX0.0V

2.4

CTRL 6

Notice for helicopters: C1 trimming affects only the throttle servo, not the pitch servo. Notice also that the helicopter throttle servo must be connected to receiver output 6, see receiver layout on page 59.

Your notes

Winged models

Convenient support is provided for up to four aileron servos and four ﬂ ap servos on normal models or, for V tail and ﬂ ying wing/delta models, up to two aileron/ elevator servos plus four ﬂ ap servos.

The majority of motorized and glider models belong to the tail unit type "normal" and are equipped with one servo each for elevator, rudder and ailerons in addition to a motor throttle or electronic speed controller (or for brake ﬂ aps in the case of a glider model). Beyond this, tail unit type "2HRSv3+8" permits the connection of two elevator servos to receiver outputs 3 and 8.

If ailerons, and conditionally the ﬂ aps, are each actuated with two separate servos then settings can be made for differentiated control of all aileron and ﬂ ap pairs in the "Wing mixers" menu, i.e. settings for downward ruder throw independent of upward throw.

Finally, the position of ﬂ aps can be controlled by a control out of group CTRL 6 … 10. Alternatively, there is a phase-dependent trim function available for ﬂ aps, ailerons and elevators in the "Phase trim" menu.

The "V tail unit" is to be selected from the "Model type" menu if the model has a V tail unit instead of a normal tail unit. This V tail unit selection provides coupled elevator and ruder control functions for both

tail ﬂ aps – each controlled by a separate servo – which handles both elevator and ruder functionality.

For delta and ﬂ ying wing aircraft models, aileron and elevator functionality is affected by way of a common rudder ﬂ ap on the trailing edge of each side (right and left) of the wing. The program contains appropriate mixer functions for both servos.

Up to 7 ﬂ ight phases can be programmed into each of the 24 model memory locations.

Except for C1 trim, digital trim will be stored on a ﬂ ight-phase basis. C1 trim permits easy location of a carburetor idle setting.

Two timers are always available for ﬂ ight operation. The transmitter operating time expired since the last battery charge is also displayed.

All transmitter controls (CTRL) and switches (SW) can be assigned in the "Control adjust" menu to inputs 5 … 12 with almost no restrictions.

The "Dual Rate" and "Exponential" functions for ailerons, rudder and elevators are separately programmable and each are convertible between the two variations on a speciﬁ c ﬂ ight-phase basis.

In addition to 8 freely allocatable linear mixers, 4 curve mixers ("Free mixers" menu) and 4 dual mixers ("Dual mixer" menu), there are also ﬂ ight-phase dependent 6-point curves for control channel 1 (throttle/ brake), see "Channel 1 curve" menu). Depending on the number of wing servos, ﬁ xeddeﬁ nition mix and coupling functions can be selected from a list in the "Wing mixers" menu.

Multi-ﬂ ap menu: control of ﬂ aps as ailerons, the • inﬂ uence aileron trim on ﬂ aps controlled as ailerons, ﬂ ap differentiation, ﬂ ap function throw magnitude for all aileron and ﬂ ap pairs, ailerons controlled as ﬂ aps, elevator mixer  ﬂ aps

Brake settings: butterﬂ y, differential reduction, • elevator curves

aileron •  rudder mixer ﬂ aps •  elevator mixer

Winged models

Airbrake-Function 1

left

right

Airbrake

Flap

Elevator

Rudder/Elevator

left

V-Tail

right

AI2

FL2





FL2

RU  AI

AI2







EL  AI

Brake AI, AI2

FL, FL2

Brake

Elevator

Brake

Installation notices

Servos MUST be connected to the receiver in the sequence illustrated here.

Outputs which are not needed are simply left empty.

Also be sure to follow the notices on the next pages.

Winged aircraft with and without motor, having up to 4 aileron servos and up to 4 ﬂ ap servos …

… and tail plane type "normal" or "2 elevator servos"

Free or right flap 2 or aux. function Free or left flap 2 or aux. function Free or 2nd elevator or aux. function

Free or right aileron 2 or aux. function

Receiver power supply

Right flap or free or aux. function Flap or left flap Right aileron or aux. function Rudder Elevator or 1st elevator Aileron or left aileron Airbrake or throttle servo or speed controller (electric motor)

Receiver power supply

Free or left aileron 2 or aux. function

… and tail plane type "V tail unit"

Free or right flap 2 or aux. function Free or left flap 2 or aux. function Free or aux. function

Free or aux. function

Receiver power supply

Right flap or free or aux. function Flap or left flap Right aileron or aux. function Right rudder / elevator Left rudder / elevator Aileron or left aileron Airbrake or throttle servo or speed controller (electric motor)

Receiver power supply

Free or aux. function

Delta/ﬂ ying wing aircraft models with and without motor having up to two aileron/elevator servos and up to 2 ﬂ ap/elevator servos

Free or aux. function or right flap 2 / eleva Free or aux. function or left flap 2 / elevato Free or aux. function

Free or aux. function

Receiver power supply

Free or right flap / elevator Free or left flap / elevator Free or aux. function Free or rudder Right elevon Right elevon Airbrake or throttle servo or speed controller (electric motor)

Receiver power supply

Free or aux. function

Because of orientation differences for installed servos and their rudder linkages, the actuating direction of some servos may be initially backward. The table below provides remedies.

Model

type

V tail Rudder and

Delta, ﬂ ying wing

Servo actuation

direction

wrong

elevator reversed

Rudder correct, elevators reversed

Elevators correct, rudder reversed

Elevator and aileron reversed

Elevator correct, aileron reversed

Aileron correct, elevators reversed

Remedy

Reverse the polarity of servos 3 & 4 in the "Servo adjustment" menu

Swap the connections for servos 3 & 4 on the receiver

Reverse the polarity of servos 3 & 4 in the "Servo adjustment" menu AND on the receiver

Reverse the polarity of servos 2 & 3 in the "Servo adjustment" menu

Reverse the polarity of servos 2 & 3 in the "Servo adjustment" menu AND on the receiver

Swap servos 2 & 3 at the receiver

All "program descriptions" for menus relevant to a winged aircraft model are marked with a winged aircraft symbol …

… so only these menus need to be dealt with to program a winged aircraft model.

Winged models

Helicopter models

The advanced developments incorporated into the transmitter as well as those now in helicopter models and their components like gyros, speed regulators, rotor blades, etc. make it possible to master a helicopter even in 3D acrobatic ﬂ ight. On the other hand, a beginner needs only a few settings to get started with hovered ﬂ ight training and then can take advantage of mx-20 HoTT features, step-by-step, with increasing expertise.

The mx-20 HoTT program can operate all conventional helicopters having 1 … 4 servos for pitch control.

Six ﬂ ight phases plus autorotation are available within a model memory, see menus "Control adjust", "Phase settings" and "Phase assignment".

As with winged aircraft, here too, in addition to the basic screen's standard timers there are additional timers as well as a lap counter with ﬂ ight-phase-dependent stopwatch functionality which are available for selection (menus "Timers (general)" and "Fl. phase timers"). Except for pitch/throttle trimming, digital trimming can be stored as "global" for all ﬂ ight phases or as "ﬂ ight phase speciﬁ c". C1 trim permits easy location of an idle setting.

The control assignments of inputs 5... 12 can be made common to every ﬂ ight phase or separate ("Control adjust" menu).

A ﬂ ight phase copy function is helpful during ﬂ ight trials ("Copy / Erase" menu).

"Dual Rate" and "Exponential" functions can be coupled for roll, nick and tail rotor and programmable in two variations in every ﬂ ight phase.

There are 8 freely assignable linear mixers. There are also 4 curve mixers that can be programed and these can also be switched on or off, depending on the ﬂ ight phase, in the "Mix active/Phase" menu. Beyond this,

Helicopter models

there are also 4 dual mixers available. Available in the "Helicopter mixer" menu are ﬂ ight-

phase-dependent 6-point curves for pitch, throttle and tail rotor mixer non-linear characteristics as well as two independent swashplate mixers each for roll and nick. Independent of this, the control curve of the channel 1 joystick can be deﬁ ned with up to 6 points in every ﬂ ight phase. The beginner will initially only adapt the hover ﬂ ight point to the control middle for the non-linear characteristics.

Pre-programmed mixers in the "Helicopter mixer" menu:

Pitch curve (6-point curve)1. Channel 1 2.  Throttle (6-point curve) Channel 1 3.  Tail rotor (6-point curve) Tail rotor 4.  Throttle Roll 5.  Throttle Roll 6.  Tail rotor

Collective

Pitch Curve

Swashplate

Rotation

Roll

Throttle Pitch-Axis Channel 1

Throttle

Nick 7.  Throttle Nick 8.  Tail rotor Gyro suppress9. Swash rotation10. Swash limiter11.

The "Throttle limit" function (input 12 in the "Control adjust" menu) allows the motor to be started in any ﬂ ight phase. Control 6 – the proportional rotation control, CTRL 6 top left – is assigned to input 12 by default. This "throttle limiter" establishes – depending on its given position – the maximum possible carburetor position. This makes it possible for the motor to be controlled in the idle range, if necessary even by the proportional regulator. The throttle curves become effective only when the proportional regulator is pushed toward the full throttle direction.

Roll

Tail Rotor Pitch-Axis Channel 1

Tail Rotor

Notice for those transitioning from older Graupner systems:

In comparison to previous receiver layouts, servo connector 1 (pitch servo) and servo connector 6 (throttle servo) have exchanged places. Servos must be connected to receiver outputs as illustrated at the right in the bottom ﬁ gure. Outputs which are not used are simply left empty. More details about respective swashplate types can be found on page 86 in the

"Basic settings" menu.

Installation notices

Servos MUST be connected to the receiver in the sequence illustrated here.

Outputs which are not used are simply left empty.

Also be sure to follow the notices on the next pages.

Notice: A speed regulator is also to be connected to receiver output "6" in order to take full advantage of the throttle limiter's convenience and safety features, see text beginning on page 104. See page 169 about this.

Receiver layout for helicopter models …

… with 1 to 3 swashplate servos

Free or aux. function Free or aux. function Free or speed governor or aux. function

Free or aux. function

Receiver power supply

Gyro gain Throttle servo or speed controller Free or aux. function Tail rotor servo (gyro system) Pitch-axis 1 servo Roll 1 servo Collective pitch or roll 2 or Pitch-axis 2 servo

Receiver power supply

Free or aux. function

… with 4 swashplate servos

Free or aux. function Free or aux. function Free or speed governor or aux. function

Free or aux. function

Receiver power supply

Gyro gain Throttle servo or speed controller Pitch-axis 2 servo Tail rotor servo (gyro system) Pitch-axis 1 servo Roll 1 servo Roll 2 servo

All menus relevant to helicopter models are marked in the "program descriptions" section with a helicopter symbol …

… so only these menus need to be dealt with to program a helicopter model.

Receiver power supply

Free or aux. function

Helicopter models

Detail program description

Loading a new memory location

Anyone who has worked through to this part of the manual has certainly already tried out a bit of programming. Nevertheless a detailed description of every menu should not be left out.

This section begins with the loading of a "free" memory location, a procedure which would be performed if a new model was being "programmed".

GRAUBELE

#01

5.9V

0:00h

Stop Flt

K78

0:00 0:00

HoTT

0.0V

From the base screen, a jump to the "Multi-function list" is made by tapping on the center SET button of the right touch pad. (The center ESC button of the left touch pad will cause a jump back to the base screen.) By default, when the multi-function list is called for the ﬁ rst time after switching on the transmitter, the "Model select" menu item will be active and displayed in reverse video. If this is not the case, use the arrow keys (, ) of the left or right touch pad to select the "Model select" menu item …

Model select

Copy / Erase Suppress menus Suppress models Base setup model Model type

… then (again) tap the center SET button of the right key pad.

Detail program description - Loading a new memory location

02 03 04 05 06

    

free free free free free

    

R12

In the transmitter's delivered state, the ﬁ rst model memory is initialized to the "winged aircraft" model type and the receiver in the delivery is bound to this model memory location, recognizable by the displayed receiver code at the right end of the line. In the above example, R12 is a code for the GR-24 receiver included in the set. In contrast, a "non-bound" model memory would appear with the code placeholder "---".

The remaining memory locations, marked "

free", are not occupied and thus also

"non-bound". If you wish to program a winged aircraft model then, after leaving the "Model select" menu by tapping on the center ESC button of the left touch pad, programming of the model can begin right away … or now use the  or  keys of the left or right touch pad to select one of the free memory locations …

03 04 05 06



   

free

free free free free



   

R12

… and then tap on the center SET key of the right touch pad to conﬁ rm the choice.

Afterward you will be prompted to select the basic model type, i.e. either "winged model" or "helicopter model".

Select model type

Use the  or  of the left or right key pad to select the basic model type then tap the center SET button in the right key pad. This initializes the selected model memory with the selected model type and the display will return to the base screen. The memory location is now accordingly occupied.

On the other hand, if you wish to begin with a helicopter then use the  or  keys of the left or right key pad to select a memory location labeled "free" and tap brieﬂ y on the center SET button in the right key pad to conﬁ rm your choice. You will be now be prompted to select the basic model type, i.e. either "winged model" or "helicopter model". Select the appropriate symbol with the  or  keys of the left or right touch pad then tap brieﬂ y on the center SET button in the right touch pad to conﬁ rm your choice. This initializes the selected model memory with the selected model type and you can now program your model into this model memory.

Changing over to another model type is still possible if you ﬁ rst erase this memory location ("Copy / Erase" menu, page 64).

Notice:

If, from the base screen, the currently active model • memory is to be erased then immediately after the erase action one of the two model types, "Winged" or "Heli" must be deﬁ ned. You cannot avoid this selection even if you switch the transmitter off. When

the transmitter is switched on again the undesired occupation of the that model memory will have to be erased from another memory location.

In contrast, if a non-active memory location is erased, it will subsequently be marked as "

free" in

the "Model select" menu.

After the selected model memory is initialized with • the desired model type, the display will switch to the base screen of the freshly occupied model memory. At this time the warning …

BIND N/A

… will appear in the screen for a few seconds as notiﬁ cation that a "bond" to a receiver does not exist. With a brief tap on the center SET button in the right touch pad you can jump directly to the appropriate option.

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND

n/a

RF transmit OFF

BD1

BD2

Further details about binding a receiver can be found on page 69 or 75.

After the aforementioned "BIND. N/A" warning • message closes automatically, the warning …

Fail Safe setup t.b.d.

… will appear (also for just a few seconds) to serve

notice that no failsafe settings have yet been made. More about this can be found on page 192.

If the screen should display the warning …•

as well as rolling, pitching, tail rotor and throttle/pitch for helicopter models, to the two joysticks. Just which of these methods is used depends on the preferences of the individual model pilot. This function is set for the

Throttle

too

high !

… then move the throttle joystick, or the limiter for a helicopter, into its idle position; by default this is rotary control CTRL 6. The appearance of this warning also depends on the "Motor at C1" or "Pitch min" in the "Model type"

currently active model memory in the "Stick mode" line of the "Basic settings, model" menu, page 68 or 74.

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND Rcv Ch Map n/a

menu, refer to page 80 or "Helicopter type" page 84 for the selected setting. For winged aircraft models, select "None" to deactivate this message if you have no motor to enter.

If the transmitter already has occupied model • memories then submenus of the "Copy / Erase" menu will display a pictogram of the selected model type at the respective memory location followed by a blank line or the model name which was entered in

A default value for this setting can be made for future models in the generalized "Basic Settings" menu, page

216.

BASIC SETTINGS Own Stick mode DSC Output Pitch min

the "Basic settings " menu (see page 68 or 74) and any bond that may exist between a receiver and this model memory.

If battery voltage is too low, you cannot• switch models for safety reasons. A corresponding message will appear in the display:

not possible now voltage too low

As a basic principle, there are four different ways to assign the four control functions, aileron, elevator, rudder and throttle or brake ﬂ aps for winged models

* N.N. = Nomen Nominandum (the name to be stated)

It should be noted here once again that, in the interest of greatest ﬂ exibility in combination with the prevention of unintentional operating errors, no controls are preassigned to control channels 5 … 12 by default.

This means that, in the system's delivered state, only

servos attached to receiver outputs 1 … 4 can be moved by the two joysticks and that any servos attached to receiver connectors 5 … 12 (max) will remain in their middle positions. When a new

helicopter model is initialized, servo 6 may perform a movement – depending on the throttle limiter's position,

Detail program description - Loading a new memory location

bind R12

n/a

SEL

PPM10

back

SEL

CTRL 6 – . This condition changes for both model types only after the respective assignments have been made in the "Control adjust" menu.

On the other hand, if a newly initialized model memory is to be put into operation then it MUST ﬁ rst be appropriately "connected" with one or more receivers before the servos attached to the receiver/s can be operated. More about this can be found in the section "Binding" on page 69 or 75.

A fundamental description of programming steps for a winged aircraft model can be found in the programming examples section beginning on 226, or for helicopter models beginning on page 270.

The menu descriptions below are arranged in the sequence individual menus are listed in the multifunction list.

Detail program description - Loading a new memory location

Model select

Call up model 1 … 24

The basic operation of the transmitters keys was explained on pages 24 and 25 and, on the previous double-page, explanations were provided for navigating to the multifunction list and about how to occupy a new model memory. At this point we now wish to begin with the "normal" description of individual menu items in the sequence they are arranged in the transmitter. Therefore we will begin with the menu …

Model select

Copy / Erase Suppress menus Suppress models Base setup model Model type

As many as 24 complete model settings, including digital trim values for trim levers, can be stored. Trimming is stored automatically such that a switchover from one model to another does not cause a loss of current trim settings. To the right of the model number, each occupied model memory line in this display shows a pictograph of the model type as well as the model's name entered for the model in its "Basic settings, model" menu, page 68 or 74 and the code, if present, for the receiver "bound" to the model memory location.

Select the "Model select" menu with the arrow keys of the left or right touch pad then press brieﬂ y on the SET button in the right touch pad.

03 04 05 06

Now use the  arrow keys of the left or right touch pad to select the desired model memory from the list and activate the selection by pressing the SET button. Pressing the ESC button will cause a return to the previous menu page without activating a model change.

Notice:

If a model change causes a "Throttle too high" • warning to appear, the throttle/pitch joystick (C1) or the throttle limiter is too far in the full throttle direction.

If a model change causes the message …•

… to appear then binding settings should be checked.

If a model change causes the message …•

… to appear then respective failsafe settings should be checked.

If battery voltage is too low, the model switchover • cannot be made due to reasons of safety. An appropriate message will appear in the screen.

GRAUBELE

ULTIMATE

STARLET BELL47G

free free

 

BIND N/A

Fail Safe setup t.b.d.

R12

R12 –––

not possible now voltage too low

Detail program description - Model select

Copy / Erase

Erase or copy model  model, copy from or to SD card, copy ﬂ ight phases

Select the "Copy / Erase" menu with thearrow keys of the left or right touch pad then brieﬂ y press the

SET button.

Model select Copy / Erase

Suppress menus

Suppress models Base setup model Model type

Erase model

Model select Copy / Erase

Suppress models

Base setup model Model type Suppress: TOG

Select the "Erase model" sub-menu with the  arrow keys of the left or right touch pad then brieﬂ y press the

SET button.

Use the  arrow keys of the left or right touch pad to select the model to be erased …

Model select Copy / Erase

Suppress models

Base setup model Model type Suppress: TOG

… now the next time the SET button is pressed, it will prompt the conﬁ rmation request …

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND

STARLET

n/a

RF transmit OFF

SEL

… to appear. A NO response will cause the process to be canceled and a return to the previous screen. Selecting the YES response with the



arrow keys of the left or right touch pad followed by conﬁ rmation of the selection by brieﬂ y pressing the SET button will erase the selected model memory.

Attention: This erase process cannot be undone. All data in the selected model memory will be erased completely.

Notice: If the currently active model memory is to be erased, a model type "Winged" or "Heli" must be deﬁ ned immediately after the erase process. On the other hand, if an inactive memory location is to be erased then it will subsequently appear in the model select screen as "free".

Copy model  model

Select the "Copy model  model" sub-menu with the  arrow keys of the left or right touch pad then press

SET button.

the

0s 0s 0s

SEL

––– ––– ––– ––– –––

Timer1 Timer2 Timer3

0:00 0:00

0:00 Lap time/tim tab Lap Display

SEL

Select the model to be copied with the  arrow keys of the left or right touch pad …

TELEMETRY

TEL.RCV SETTING & DATA VIEW SENSOR SELECT RF STATUS VIEW VOICE TRIGGER

BIND. 1

… whereby a second activation of the SET button in the right touch pad will allow the "Copy to model" window for the destination memory to be selected with the  arrow keys of the left or right touch pad and then conﬁ rmed with yet another press of the SET button or canceled with the ESC button. A memory location which is already occupied can be overwritten.

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND Rcv Ch Map n/a

GRAUBELE

bind

n/a

R12 BD1

BD2

Detail program description - Copy / Erase

Once selection of the model memory has been conﬁ rmed by pressing the SET button, a conﬁ rmation request will appear.

modell really

01 03

ULTIMATE

frei



to be copied?

YES

A NO response will cancel the process and return the screen to the originating screen. If the  YES response is selected and conﬁ rmed by activating the SET button then the selected source model will be copied into the selected model memory destination.

Notice: In addition to model data, binding data is also copied by this process. This means that a receiver system which was/is bound to the original model memory can also be operated by its copy without establishing the bond again.

Export to SD

Select the "Export to SD" sub-menu with the  arrow keys of the left or right touch pad and press the

SET

button.

Erase model Copy model–>model Export to SD Import from SD Copy flight phase

=> => => =>

=> =>

Select the model to be exported with the  arrow keys of the left or right touch pad.

export to SD-CARD: 01

03 04

GRAUBELE

ULTIMATE

STARLET BELL47G

frei



R12

R12 –––

After conﬁ rming the selected model memory by pressing the SET button, a conﬁ rmation request will appear.

modell

ULTIMATE

SD-Karte

export ?

YES

A NO response will cancel the process and return the screen to the originating screen. However, if the  YES response is selected then conﬁ rmed by pressing the SET button, the selected model will be copied to the SD card.

Notice:

Should the notice …•

SD-CARD

INSERT

… appear instead of a screen for model selection, there is no SD card in the transmitter's card slot, see page 22.

In addition to model data, binding data is also copied • by this process. This means that a receiver system which was/is bound to the original model memory can also be operated in the SAME transmitter by its copy without establishing the bond again.

An exported winged aircraft model will be stored • on the memory card in the \\Models\mx-20 folder with a ﬁ lename format of "aModellname.mdl" and a helicopter model with a ﬁ lename format of "hModellname.mdl". On the other hand, if a "nameless" model is exported, its data will be stored on the memory card under "ahNoName.mdl" or "hNoName.mdl", as appropriate.

Some special characters that can be used in model • names are subject to speciﬁ c restrictions associated with the FAT or FAT32 ﬁ le system used by the memory cards and these special characters will be replaced during the copy process with a tilde (~).

A model ﬁ le already on the memory having the same • name as the ﬁ le to be copied will be overwritten without warning.

Detail program description - Copy / Erase

Import from SD

Select the "Import from SD" sub-menu with the arrow keys of the left or right touch pad and press the SET button.

Erase model Copy model–>model Export to SD Import from SD Copy flight phase

=> => =>

=> =>

Select the model to be imported from the SD memory card with the  arrow keys of the left or right touch pad.

import from SD-CARD:

ALPINA

EXTRA

COBRA BELL47G



frei

11/03/10

11/03/11

11/03/11 11/03/12



Notice: The export date posted at the right end of each model name line is represented in the format "year/month/day".

After again pressing the SET button in the right touch pad, the "import to model" window will appear Now the destination memory location can be selected with the  arrow keys of the left or right touch pad and conﬁ rmed by pressing the SET button or the process can be canceled with the ESC button. A memory location which is already occupied can be overwritten.

Detail program description - Copy / Erase

import to model: 01 02 03 04

GRAUBELE ULTIMATE STARLET BELL47G

free



R12 R12 R12 –––

After conﬁ rming the selected model memory by pressing the SET button, a conﬁ rmation request will appear.

modell

01 03

ULTIMATE

free



import ?

YES

A NO response will cancel the process and return the screen to the originating screen. However, if the  YES response is selected and conﬁ rmed by pressing the SET button then the selected source model will be imported into the selected destination model memory.

Notice:

If the message …•

SD-CARD

INSERT

… appears instead of a screen for model selection, there is no SD card in the transmitter's card slot, see page 22.

In addition to model data, binding data is also • imported by this process. This means that a receiver system which was/is bound to the original model memory can also be operated in the SAME transmitter

by its copy without establishing the bond again.

Copy from phase

Select the "Copy from phase" sub-menu with the  arrow keys of the left or right touch pad then press the

SET button.

Erase model Copy model–>model Export to SD Import from SD Copy flight phase

=> => => =>

=> =>

In the "Copy from phase" sub-menu …

Copy from phase:

3 5 7

2 4 6

=> =>

… the ﬂ ight phase to be copied (1 … 7 for winged aircraft models or 1 … 6 for helicopter models) is selected with the arrow keys of the left or right touch pad then conﬁ rmed by brieﬂ y pressing the SET button in the right touch pad. The next window to appear will be the "Copy to phase" window. In that window the destination is to be selected and then also conﬁ rmed. As described above, another conﬁ rmation request will be issued.

Suppress menus

Suppress models

Hide menus in the multifunction

Select the "Suppress menus" menu with the  arrow keys of the left or right touch pad then brieﬂ y press the

SET button.

Model select Copy / Erase Suppress menus

Suppress models

Base setup model Model type

In the menu which then appears, menu items which are no longer needed or those which should not be changed, can be blocked from appearing in th multifunction list.

Model select Copy / Erase

Suppress models

Base setup model Model type Suppress: TOG

This reduces the appearance of the multi-function list considerably, in some cases to only a few menus, thus substantially improving the clarity of the function selection list. Functions are not deactivated because they are hidden. They will simply no longer appear in the list. This also blocks direct access to these functions.

The function to be hidden or displayed is to be selected with the arrow keys of the left or right touch pad then its (hide/display) status switched-over by means of the center SET button in the right touch pad.

Model select Copy / Erase

Suppress models

Base setup model Model type Suppress: TOG

Tip: If you wish to forgo access-blockage to the multifunction list altogether, hide the "Code lock" menu in the multi-function list by way of this menu as a precautionary measure.

Hiding model memory locations

Select the "Suppress models" menu with the  arrow keys of the left or right touch pad then brieﬂ y press the

SET button.

Model select Copy / Erase Suppress menus

Suppress models

Base setup model Model type

Model memories which are rarely needed or to which access is to be blocked for other reasons can be hidden from the model selection list. This also clariﬁ es the overview layout for model selection.

A model to be hidden/displayed is selected with the arrow keys of the left or right touch pad then its status is switched-over by means of the center SET button in the right touch pad.

03 04 05

A model memory which is "stricken through" will no longer appear in the "Model select" menu.

GRAUBELE

ULTIMATE

STARLET BELL47G



free

Suppress:



E12

E12 –––

TOG

Detail program description - Suppress menus and models

Base setup model

Model-speciﬁ c base settings for winged aircraft models

Before programming speciﬁ c parameters, there are some basic settings to be made which effect the currently active model memory.

Select the "Base setup model" menu with the arrow keys of the left or right touch pad then press the center

SET button in the right touch pad.

Suppress models

Base setup model

Model type Servo adjustment Stick mode Control adjust

Model name

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND

n/a

RF transmit OFF

BD1

Change to the next screen page by pressing the SET button brieﬂ y. This will open a screen of characters for entry of the model's name. A maximum of 9 characters can be used to specify a model name.

!"#$%&’()+,–./012 3456789:;

?@AB CDE FGHIJKLMNOPQRSTUVWX YZ[¥]^_`abcdefghijk

Mod Name

Detail program description - Base setup model

GRAUB

n/a

BD2

Select the desired characters with the arrow keys of the left touch pad. Move to select the next character position by pressing the  arrow key of the right touch pad or its

SET button. Simultaneously pressing the  or

center  of the right touch pad (CLEAR) will place a space character at the position.

Positioning to any character position within the entry ﬁ eld can be done with the  keys of the right touch pad.

A return to the previous menu screen is accomplished by pressing the center ESC button in the left touch pad.

After entering the model name it will appear in the base screen of the "Model select" menu and in the sub-menu for the "Copy /Erase" menu item.

Stick mode

"MODE 1" (throttle left)

Stick forward

Rudder left

Stick back

"MODE 3" (throttle right)

Stick forward

Aileron left

Stick back

Rudder right

Aileron right

Motor full throttle

Aileron left

Motor idle

Motor full throttle

Rudder left

Motor idle

"MODE 2" (throttle left)

Motor full throttle

Aileron right

Rudder left

Motor idle

"MODE 4" (throttle left)

Motor full throttle

Rudder right

Aileron left

Motor idle

Rudder right

Aileron right

Stick forward

Aileron left

Stick back

Stick forward

Rudder left

Stick back

Aileron right

Rudder right

There are four fundamental options for assigning the four control functions (aileron, elevator, rudder and throttle/brake ﬂ ap) for a winged aircraft model to the two joysticks. Just which of these options is chosen depends on the individual preferences of the individual model pilot.

Select the "Stick mode" line with the  arrow keys of the left or right touch pad. The option ﬁ eld will be enclosed in a frame.

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND

GRAUBELE

n/a

RF transmit OFF

SEL

Press the SET button. The currently displayed stick mode will be displayed in inverse video. Now use the arrow keys of the right touch pad to select from among options 1 through 4.

Pressing simultaneously on the  or  keys of the right touch pad (CLEAR) will return the option selection back to stick mode "1".

Pressing the SET button again will deactivate option selection so that you can change to another line.

Bound receiver

Graupner HoTT receivers must be "instructed" to communicate exclusively with one particular model (memory) in a Graupner HoTT transmitter. This procedure is known as "binding" and must only be done once for every new receiver/model memory location combination (and can be repeated anytime).

Important notice: During the binding procedure be sure the transmitter's antenna is always far enough away from the receiver's antenna. To be on the safe side, keep them at least one meter apart. Otherwise you run the risk of a faulty connection to the return channel and malfunctions will result.

"Binding" multiple receivers per model

Multiple receivers per model can be bound if desired, whereby respective mx-20 HoTT programs offer the potential for managing a maximum of two receivers directly and for dividing up the 12 control channels (max) available on these two receivers as desired under menu control. Refer to additional details further down in this section. Binding two receivers is begun by ﬁ rst binding the individual receivers as described below.

In subsequent operation of the model only one of these receivers will establish a telemetry bond to the transmitter; the one which was activated in the "Tel. RCV" line of the "Telemetry" menu. For example:

TELEMETRY

TEL.RCV SETTING & DATA VIEW SENSOR SELECT RF STATUS VIEW VOICE TRIGGER

BIND. 1

Any telemetry sensors which may be built into the model should therefore be connected to this receiver because the transmitter only receives and evaluates data from the return channel of the receiver activated on this line. The second, and all other receivers, operate in parallel but are fully independent in slave mode.

"RF bind " of transmitter and receiver

Use the  arrow keys of the left or right touch pad to move to the screen's "RF bind" line" then select the desired binding channel. For an example like that shown in the figure below, choose "BD2" because the binding channel designated as "BD1" in the screen's bottom line is already used by default for the receiver which was delivered with the set.

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND Rcv Ch Map n/a

GRAUBELE

bind

n/a

R12 BD1

BD2

If not already off, now switch the receiver on. The red LED on the receiver will blink.

Press and hold the SET button on the receiver while the LED continues to blink red for about 3 seconds then after about another 3 seconds begins to blink red/green. You can now release the SET button As long as this LED blinks red/green, the receiver is in bind mode.

Now, within this 3 second period, start the so-called "receiver binding" process for the receiver to the currently active model memory by brieﬂ y pressing the center SET button of the right touch pad. At this time the screen's display will begin to indicate the duration of the "bond".

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND

Finding ...

Rcv Ch Map n/a

GRAUBELE

bind

n/a

R12 BD1

BD2

If the receiver's LED, again blinking red, changes within about 10 seconds to continuous illumination in green, the binding process has been successfully completed. Your model-memory to receiver combination is now operationally ready. At this time the screen will now display "bind" (bound) instead of "n/a" (not attached). For example:

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND Rcv Ch Map

GRAUBELE

1 bind R12

BD1

bind

R08

BD2

On the other hand, should the LED on the receiver blink red for longer than about 10 seconds, the binding process has failed. In this case the screen will continue to show the status as "n/a". If this should happen, try changing the position of antennas then repeat the entire procedure.

Binding other receivers

The binding channel you have chosen is already bound (as indicated by the "bind" status). with another binding channel. After initiating the RF bind process, instead of displaying "BINDING", the message shown below appears.

Detail program description - Base setup model

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND Rcv Ch Map

Drop down two lines in the screen and switch off the RF module as described on the page in section "RF module". Afterward, return again to the "RF BIND" line and restart the process to dissolve bond as described on the previous page.

Alternatively you can brieﬂ y switch off the transmitter then, after switching it back on again, respond to the message window that appears …

… with "OFF" …

… then conﬁ rm the selection by brieﬂ y pressing the center SET button in the right touch pad. From the base screen jump again into the "RF BIND" line of the "Basic settings, model" menu and restart the binding process.

Dissolving a bond

Proceed as described above to initiate the binding process but WITHOUT ﬁ rst putting a receiver in binding readiness.

Detail program description - Base setup model

must be

Please select

RF on/off?

Please select

RF on/off?

GRAUBELE

bind

OFF

R12

BD1

OFFON

OFF

bind

R08

BD2

Receiver change map

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND Rcv Ch Map

As mentioned in the introduction to the "Binding receivers" section, the mx-20 HoTT offers both the opportunity to freely divide up the transmitter's control channels within a receiver and the opportunity to distribute the transmitter's 12 control channels across two receivers. This redistribution is subsequently referred to as "mapping" or "channel mapping" (channel correlation). Select the receiver to be "mapped" with the arrow keys of the left or right touch pad then brieﬂ y press the center SET button in the right touch pad.

Channel mapping within a receiver

Analogous to the channel correlation function in the "Telemetry" menu on page 212, described as "Channel Mapping", it is very simple to use this menu item to freely distribute the 12 control channels (inputs) to the outputs (servo connections) of the bound receiver speciﬁ ed by column BD1.

RECEIVER CH – BIND1 In Ch 1 In Ch 2 In Ch 3 In Ch 4 Out Ch 4

After selection of the desired output with the arrow keys of the left or right touch pad, the corresponding

GRAUBELE

1 bind R12

BD1

Out Ch 1 Out Ch 2 Out Ch 3

bind

R08

BD2

input ﬁ eld will be framed. Press brieﬂ y on the center

SET button in the right touch pad. The current setting is

displayed in inverse video. Now select the desired input channel (= transmitter output, see page 206) with the arrow keys of the left or right touch pad.

Notice: The number of lines available in the list (outputs) corresponds to the maximum number of servos which can be attached to the given receiver.

BUT CAUTION: If, for example, you have already speciﬁ ed "2AIL" in the "Aile/ﬂ aps" line of the "Model type" menu then the transmitter will have allocated

control function 2 (ailerons) for left and right ailerons to control channels 2 & 5. The corresponding inputs (to the receiver) in this case would be channels 2 & 5 and these

should be assigned accordingly, refer to the example below.

Examples:

You would like to control each aileron of a large • model with two or more servos.

Assign each of the appropriate outputs (servo connections) to one and the same input (control channel). In the aforementioned case, to the giveninput of one of the two default aileron control channels (2 & 5) appropriate for the left or right wing.

You would like to control the rudder of a large model • with two or more servos.

Assign each of the appropriate outputs (servo connections) to one and the same input (control channel). In this case, the default rudder channel (4), see ﬁ gure bottom right.

Important notice:

By using the mx-20 HoTT transmitter's "Tx. output swap " option the transmitter's 12 control functions can be freely swapped in a similar manner or multiple outputs can be assigned to the same control function. To avoid confusion, it is strongly recommended that only one of these two options is used.

Channel assignment on the second receiver

As already mentioned, the "Receiver channel mapping" option can be used to freely distribute the mx-20 HoTT transmitter's 12 control channels across two receivers, whereby the numbering sequence of outputs (servo connections) begun in the "BD1" column for bound "receiver 1" will be continued. For example, if "receiver 1" has enough connectors for 12 servos then the numbering of outputs in the "BD2" column (for the second bound receiver) will begin with 13.

RECEIVER CH – BIND2 In Ch12 In Ch12 In Ch12 In Ch12 Out Ch16

After selection of the desired output with the arrow keys of the left and right touch pad, the corresponding input ﬁ eld will be framed. Press the center SET button in the right touch pad The current setting is displayed in inverse video. Now select the desired input channel with the arrow keys of the right touch pad. For example, suitable to the above rudder example.

Out Ch13 Out Ch14 Out Ch15

RECEIVER CH – BIND2 Input 4 Input 4 Input 4 Input 4

Notice: The number of lines available (outputs) corresponds to the maximum number of servos which can be connected to receiver 2 and their numbering is dependent on the maximum number of servos which can be connected to receiver 1.

RF transmit

This menu line provides an option for manually switching the transmitter's RF transmission on and off to speciﬁ c models while the transmitter is in operation. For example, to save power while a model is being programmed. If this line option was set to OFF, it

will be canceled (i.e. set to ON) the next time the transmitter is switched on.

If necessary, use the  arrow keys of the left or right touch pad to reach the "RF transmit" line then activate the option with by brieﬂ y pressing the center SET button in the right touch pad

BASIC SETTINGS, MODEL

Stick mode RF BIND Rcv Ch Map RF transmit

Out Ch13 Out Ch14 Out Ch15 Out Ch16

bind R12

bind

R08

OFF

SEL

between OFF and ON. Again pressing the center SET button in the right touch pad will complete the entry.

Range test

The built-in range test reduces transmission power to an extent that a function test can be carried out even within a distance of up to about 50 m.

Perform the range test on the Graupner HoTT system according to the following instructions. If necessary, have someone assist you in carrying out the range test.

Preferably the receiver already bound to the 1. transmitter should be installed into the model in its intended position.

Switch remote control on and wait for the receiver's 2. green LED to light up. Now servo movements can be observed.

Place the model on a level surface (pavement, 3. low-cut grass or bare ground) such that receiver antennas are at least 15 cm above ground level. It may be necessary to put something under the model to raise it up enough for this.

Hold the transmitter at hip level and at some distance 4. from one's body. Do not point the antenna directly at the model but rather turn and/or kink the antenna's end so that it is oriented vertically during the test.

If necessary, use the 5.  arrow keys of the left or right touch pad to reach the "RF Range Test" the menu then start range test mode by pressing the center SET button in the right touch pad.

line in

The right arrow keys can now be used to choose

Detail program description - Base setup model

BASIC SETTINGS, MODEL

RF BIND Rcv Ch Map RF transmit RF Range Test 99sec

When the range test is activated, the transmitter's output power will be signiﬁ cantly reduced and the blue LED on the antenna's socket will begin to blink. At the same time, the timer display in the transmitter's screen will start counting down and every 5 seconds a two-frequency tone will sound.

GRAUBELE

#01

TEST 76s

5.2V

2:22h

Five seconds prior to the end of the range test a three-frequency tone will sound once every second. After expiration of the range test's 99th second the transmitter will again be switched to full output power and the blue LED will again illuminate constantly.

Move away from the model while manipulating 6. the joysticks during this timespan. If you notice an interruption anytime while still within a distance of about 50 m, try to reproduce this malfunction.

If there is a motor in the model, it may be necessary 7. to switch it on to further check noise immunity.

Continue moving away from the model until perfect 8. control is no longer possible.

Wait at this distance for the remainder of the test 9.

Detail program description - Base setup model

bind R12

Stop Flt

«normal »

K78

bind

R08

OFF

SEL

0:00 0:00

HoTT

5.5V

period with the still-operationally-ready model to expire. After the range test is ended it should again respond correctly to all RC controls. If this is not 100 % the case, do not use the system. Contact your area's Graupner GmbH & Co. KG service partner.

Perform the range test before each ﬂ ight and, in 10.

doing so, simulate all servo movements which also take place during ﬂ ight. The range must always be at 50 m on the ground in order to assure safe model operation.

Attention: Never start the range test on the transmitter during normal operation of the model.

DSC output

If necessary, use the  arrow keys of the left or right touch pad to reach the "DSC output" then activate this menu item by brieﬂ y pressing the center SET button in the right touch pad.

BASIC SETTINGS, MODEL

Rcv Ch Map RF transmit RF Range Test DSC output PPM10

Now you can use the right arrow keys to choose between three types of modulation "PPM10", "PPM18" and "PPM24". Pressing the center SET button in the right touch pad again will complete the entry.

line of the menu

R12

R08

OFF

99sec

SEL

is control channels 1 ... 5 if "PPM10" is selected, control channels 1 ... 9 for "PPM18" and control channels 1 ... 12 for "PPM24".

Cut-off

Depending on the "idle forward or back" choice made in the "Motor at C1" line of the "Model type" menu, this motor "cut off" option can be coupled to a switch for throttling down a speed controller or to move a servo on the carburetor of a motor to the OFF (or idle) position.

The motor OFF position (or idle setting) will then be preset by the left column directly over the "SEL" ﬁ eld. The appropriate value for this entry ﬁ eld is to be established through trial and error

A speed controller or throttle servo will only take on this preset position when a certain servo position or threshold is underrun and a switch is activated. This is done by setting the desired servo position (threshold value) into the middle column, directly over the "STO" ﬁ eld then selecting the appropriate ON/OFF switch function in the right column.

If the percentage value speciﬁ ed for the middle • column is greater than the current servo position, i. e. the current servo position lies below the threshold, the switchover will occur as soon as the switch is put into its ON position.

If the percentage value speciﬁ ed for the middle • column is less than the current servo position, i. e. the current servo position is above the threshold, the speed controller will initially reduce motor speed or close the carburetor's throttle servo only to the extent dictated by the value in the left column as soon as the servo's position once underrunsthe threshold (max. +150 %) after the switch is changed over to its

ON position. The speed controller or throttle servo will remain in

this cut-off position only until the selected switch is again changed over followed by a one-time throttle servo or speed controller movement beyond the preset threshold with the throttle/brake joystick control.

The factory setting for the left column is -100 % for the throttle servo "cut-off" position and a threshold of +150 % servo position setting in the middle column.

speed controller, alone by the switch to be assigned in the right column.

However, if you wish to set a lower threshold, by which an underrun will cause the throttle servo or speed controller with closed switch to switch into the cut-off position, reduce the preset servo travel from +150 % by placing the throttle servo or speed controller into the desired position with the throttle/brake joystick then press the center

SET button in the right touch pad.

BASIC SETTINGS, MODEL

99sec

PPM10

STO

99sec

PPM10

+150%

STO

OFF

–––

OFF

–––

RF transmit RF Range Test DSC Output cut off +150%–100%

SEL

Programming

To change the preset "cut-off" position of the throttle servo, press the center SET button in the right touch pad. The current setting will be displayed in inverse video. Now use the arrow keys of the left or right touch pad to set a value at which the motor is reliably "off". If a combustion motor is involved, be sure the throttle servo does not perform mechanical runout, e. g. -125 %.

BASIC SETTINGS, MODEL

RF transmit RF Range Test DSC output cut off

The – upper – preset value in the middle column ensures the motor can be stopped, throughout the maximum possible positioning range of the servo or

–125%

SEL

BASIC SETTINGS, MODEL

RF transmit RF Range Test DSC output cut off

Finally, use the column at the right to specify a switch with which you can cut off the motor directly (emergency) or which will be activated by the threshold.

BASIC SETTINGS, MODEL

RF transmit RF Range Test DSC output cut off

Notices:

Be sure the throttle servo does not run out • mechanically when the cut-off function is activated.

A threshold over +100 % is reached by temporarily • increasing the travel for servo 1 in the "Servo adjustment" menu to over 100 % then, after storing the threshold, change servo travel back to the original value.

–125% +100%

SEL

–125% +100%

SEL

OFF

99sec

PPM10

–––

STO

OFF

99sec

PPM10

STO

Detail program description - Base setup model

Base setup model

Model-speciﬁ c base settings for helicopter models

Before programming speciﬁ c parameters, there are some basic settings to be made which effect the currently active model memory. Select the "Base setup model " menu with the arrow keys of the left or right touch pad then press the center touch pad.

Suppress models

Base setup model

Helicopter type Servo adjustment Stick mode. Control adjust

Model name

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND RF transmit OFF

Change to the next screen page by brieﬂ y pressing the SET button in the right touch pad. This will open a screen of characters for entry of the model's name. A maximum of 9 characters can be used to specify a model name.

!"#$%&’()+,–./012 3456789:; FGHIJKL MNOPQRSTUVWX YZ[¥]^_`abcdefghijk

Mod Name

Detail program description - Base setup model | Helicopter

SET button in the right

n/a

BD1

BD2

?@ABCDE

STARL

n/a

Select the desired characters with the arrow keys of the left touch pad. Move to select the next character position by pressing the  arrow key of the right touch pad or its

SET button Simultaneously pressing on the 

center or  keys of the right touch pad (CLEAR) will place a space character at the position.

Positioning to any character position within the entry ﬁ eld can be done with the  keys of the right touch pad.

A return to the previous menu screen is accomplished by pressing the center ESC button in the left touch pad.

A model name entered in this manner will appear in the base screen of the "Model select" menu and in the submenus of the "Copy / Erase" menu item.

Stick mode

"MODE 1" (throttle left)

TS-Nick

Tail

Nick

"MODE 3" (throttle right)

Nick

Roll

Nick

Motor/Pitch

Tail

Roll

Motor/Pitch Motor/Pitch

Motor/Pitch

Roll

Tail

Motor/Pitch

"MODE 2" (throttle left)

Motor/Pitch

Roll

Tail

"MODE 4" (throttle left)

Motor/Pitch

Tail

Roll

Motor/Pitch

Tail

Roll

Nick

Roll

Nick

Tail

Nick

Basically there are four different ways to assign the four helicopter control functions, roll, nick, tail rotor and throttle/pitch to the two joysticks. Just which of these is used depends on the preferences of the individual model pilot.

Use the  arrow keys of the left or right touch pad to select the "Stick mode" line. The option ﬁ eld will be framed.

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND

STARLET

n/a

RF transmit OFF

SEL

Press the SET button. The currently displayed stick mode will be displayed in inverse video. Now use the arrow keys of the right touch pad to select from among options 1 through 4.

Pressing simultaneously on the  or  keys of the right touch pad (CLEAR) will return the option selection back to stick mode "1".

Pressing the SET button again will deactivate option selection so that you can change to another line.

Bound receiver

Graupner-HoTT receivers must be "instructed " to communicate exclusively with one particular model (memory) in a Graupner-HoTT transmitter. This procedure is known as "binding" and must only be done once for every new receiver/model memory location combination (and can be repeated anytime).

"Binding" multiple receivers per model

Multiple receivers per model can be bound if desired,

whereby respective mx-20 HoTT programs offer the potential for managing a maximum of two receivers directly and for dividing up the 12 control channels (max) available on these two receivers as desired under menu control. Refer to additional details further down in this section. Binding two receivers is begun by ﬁ rst binding the individual receivers as described below.

TELEMETRY

TEL.RCV SETTING & DATA VIEW SENSOR SELECT RF STATUS VIEW VOICE TRIGGER

BIND. 1

"Binding" the transmitter and receiver

Use arrow keys of the left or right touch pad to move to the screen's "RF bind" line then select the desired binding channel. For an example like that shown in the figure below, choose "BD2" because the binding channel designated as "BD1" in the screen's bottom line is already used by default for the receiver which was delivered with the set.

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND Rcv Ch Map

STARLET

bind R12

BD1

n/a

BD2

If not already off, now switch the receiver on. The red LED on the receiver will blink.

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND

Finding ...

Rcv Ch Map

STARLET

bind R12

BD1

n/a

BD2

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND Rcv Ch Map

STARLET

bind R12

BD1

bind

R08

BD2

Binding other receivers

The binding channel you have chosen is already bound (as indicated by the "bind" status). with another binding channel. If, after initiating the RF bind process, the message shown below appears in the screen instead of displaying "BINDING"

Detail program description - Base setup model | Helicopter

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND Rcv Ch Map

Alternatively you can brieﬂ y switch off the transmitter then, after switching it back on again, respond to the message window that appears …

… with "OFF" …

Dissolving a bond

Proceed as described above to initiate the binding process but WITHOUT ﬁ rst putting a receiver in binding readiness.

Detail program description - Base setup model | Helicopter

must be

Please select

RF on/off?

Please select

RF on/off?

OFF

STARLET

bind

R12 BD1

bind

R08

BD2

Receiver change map

BASIC SETTINGS, MODEL

Mod.name Stick mode RF BIND Rcv Ch Map

As mentioned in the introduction to the "Binding receivers" section, the mx-20 HoTT offers both the opportunity to freely divide up the transmitter's control channels within a receiver as well as the opportunity to distribute the transmitter's 12 control channels across two receivers. This redistribution is subsequently referred to as "mapping" or "channel mapping" (channel correlation). Select the receiver to be "mapped" with the arrow keys of the left or right touch pad then brieﬂ y press the center SET button in the right touch pad.

Channel mapping within a receiver

Analogous to the channel correlation function in the " Telemetry " menu on page 212, described as "Channel Mapping", it is very simple to use this menu item to freely distribute the 12 control channels (inputs) to the outputs (servo connections) of the bound receiver speciﬁ ed by column BD1.

RECEIVER CH – BIND1 In Ch 1 In Ch 2 In Ch 3 In Ch 4 Out Ch 4

After selection of the desired output with the arrow keys of the left and right touch pad, the corresponding input

STARLET

bind

R12 BD1

Out Ch 1 Out Ch 2 Out Ch 3

bind

R08

BD2

ﬁ eld will be framed. Press brieﬂ y on the center SET button in the right touch pad. The current setting will be displayed in inverse video. Now select the desired input channel (= transmitter output, see page 206) with the arrow keys of the left or right touch pad.

Notice: The number of lines available in the list (outputs) corresponds to the maximum number of servos which can be attached to the given receiver.

BUT CAUTION: If you wish to operate two servos with one control function, for example such as transmitter control function 2 (roll) which is divided up into control channels 1 & 2 for left and right roll servos by "3Sv(2Roll)" in the " in the "Heli Type" menu; then "map" transmitter outputs 1 & 2 (= inputs to the receiver) accordingly.

Important notice:

By using the mx-20 HoTT transmitter's "Tx. output swap" option, the transmitter's 12 control functions can be freely swapped in a similar manner or multiple outputs can be assigned to the same control function. To avoid confusion, it is strongly recommended that only one of these two options is used.

Channel assignment on the second receiver

second bound receiver) will begin with 13.

RECEIVER CH – BIND2 In Ch12 In Ch12 In Ch12 In Ch12 Out Ch16

After selection of the desired output with the arrow keys of the left and right touch pad, the corresponding input ﬁ eld will be framed. Press the center SET button in the right touch pad The current setting will be displayed in inverse video. Now select the desired input channel with the arrow keys of the right touch pad. For example, appropriate for the above example with roll servos:

RECEIVER CH – BIND1 In Ch 1 In Ch 2 In Ch12 In Ch12

RF transmit

Out Ch13 Out Ch14 Out Ch15

Out Ch13 Out Ch14 Out Ch15 Out Ch16

programmed. If this line option was set to OFF, it will be canceled (i.e. set to ON) the next time the transmitter is switched on.

If necessary, use the arrow keys of the left or right touch pad to reach the "RF transmit " line then activate

bind R12

SET button in

bind

R08

OFF

SEL

the option by brieﬂ y pressing the center the right touch pad.

BASIC SETTINGS, MODEL

Stick mode RF BIND Rcv Ch Map RF transmit

The right arrow keys can now be used to choose between OFF and ON. Again pressing the center SET button in the right touch pad will complete the entry.

Range test

The built-in range test reduces transmission power to an extent that a function test can be carried out even within a distance of up to about 50 m.

Perform the range test on the Graupner HoTT system according to the following instructions. If necessary, have someone assist you in carrying out the range test.

Preferably the receiver already bound to the 1. transmitter should be installed into the model in its intended position.

Switch remote control on and wait for the receiver's 2. green LED to light up. Now servo movements can be observed.

Place the model on a level surface (pavement, 3. low-cut grass or bare ground) such that receiver antennas are at least 15 cm above ground level. It

may be necessary to put something under the model to raise it up enough for this.

If necessary, use the 5. arrow keys of the left or right touch pad to reach the "RF Range Test" line in the menu then start range test mode by pressing the

SET button in the right touch pad.

center

BASIC SETTINGS, MODEL

RF BIND Rcv Ch Map RF transmit RF Range Test 99sec

STARLET

#02

TEST 76s

5.2V

2:22h

bind R12

Stop Flt

«normal »

K78

bind

R08

OFF

SEL

0:00 0:00

HoTT

5.5V

Detail program description - Base setup model | Helicopter

and the blue LED will again illuminate constantly. Move away from the model while manipulating 6.

the joysticks during this timespan. If you notice an interruption anytime while still within a distance of about 50 m, try to reproduce this malfunction.

If there is a motor in the model, it may be necessary 7. to switch it on to further check noise immunity.

Continue moving away from the model until perfect 8. control is no longer possible.

Wait at this distance for the remainder of the test 9. period with the still-operationally-ready model to expire. After the range test is ended it should again respond correctly to all RC controls. If this is not 100 % the case, do not use the system. Contact your area's Graupner GmbH Co. KG service partner.

Perform the range test before each ﬂ ight and, in 10. doing so, simulate all servo movements which also take place during ﬂ ight. The range must always be at 50 m on the ground in order to assure safe model operation.

Attention: Never start the range test on the transmitter during normal operation of the model.

DSC output

If necessary, use the  arrow keys of the left or right touch pad to reach the "DSC output" this menu item by pressing the center SET button of the right touch pad.

line then activate

BASIC SETTINGS, MODEL

Rcv Ch Map RF transmit RF Range Test DSC output PPM10

Now you can use the right arrow keys to choose between three types of modulation "PPM10", "PPM18" and "PPM24". Pressing the center SET button in the right touch pad again will complete the entry.

This choice primarily inﬂ uences the maximum number of control channels which can be attached to the DSC (direct servo control) socket, and thus also available to a ﬂ ight simulator or teacher/pupil system. This maximum is control channels 1 ... 5 if "PPM10" is selected, control channels 1 ... 9 for "PPM18" and control channels 1 ... 12 for "PPM24".

Autorotation

Autorotation is that state of descending ﬂ ight in which the pitch of main rotor blades are set such that the rotor's speed matches the natural forces of air ﬂ owing through, like a windmill. This built-up energy can be used for "recovery" lift to brake a descent by appropriate blade pitch adjustment.

Autorotation is a means by which real and model helicopters are able to land safely in emergency situations, e. g. in the event of a motor failure. However, the prerequisite for this is a well-trained pilot familiar with the helicopter's characteristics. Quick reaction and good perceptiveness are necessary because the rotor's inertia can only be used once to generate recovery lift.

When this technique is evaluated during competitions,

R12

R08

OFF

99sec

SEL

the motor must be switched off for autorotation. For training purposes it is better to keep the motor running at idle during autorotation.

The Autorotation switch causes a switchover to the autorotation ﬂ ight phase in which control of "throttle" and "pitch" are separate and all mixers which have an effect on the throttle servo are switched off. Corresponding parameter settings are made in the "Helicopter mixer" menu (see page 178); refer also to the "Principle of the Auto. C1 Pos." topic which follows.

The "Autorotation" name is permanently assigned to phase 1 and it is included in the base screen of all ﬂ ight phase dependent menus. This name can NOT be changed. It is only possible to assign a switch to this option, as described on page 52. If a switch is

assigned, it will have absolute priority over all other ﬂ ight-phase switches.

Thr Curve Input Output Point

Normal

More about ﬂ ight-phase programming can be found in the text beginning on page 164 in the "Helicopter

mixer" section.

Auto.C1 Pos. (Autorotation C1 position)

The autorotation ﬂ ight-phase can alternatively be activated by a threshold point for the C1 throttle/pitch joystick. To set such a threshold, use the  arrow keys of the left or right key pad to reach the "Auto.C1 Pos." line.

off

–100%

0% 0%

Detail program description - Base setup model | Helicopter

As soon as this line has been selected, the value ﬁ eld in its column directly above STO on the screen's bottom line will be framed.

BASIC SETTINGS, MODEL

RF Range Test DSC Output Autorotation Auto.C1 Pos. 0%

Move the C1 joystick into the desired threshold switchover position then press the center SET button in the right touch pad. The current value will be displayed, e. g.:

BASIC SETTINGS, MODEL

RF Range Test DSC Output Autorotation Auto.C1 Pos.

After this has been done, use the arrow keys to move into the column above the switch symbol then assign a switch to this ﬁ eld, as described on page 52 in section "Switches, controls and control switches". Preferably the selection will be one of the two self-resetting switches, SW 1 or 9.

BASIC SETTINGS, MODEL

RF Range Test DSC Output Autorotation Auto.C1 Pos.

99sec

PPM10

STO

99sec

PPM10

-55% STO

99sec

PPM10

-55% STO

––– –––

–––

Once this activation switch is closed, the ﬁ rst occurrence of a threshold underrun will cause the program to switch over to "Autorotation" and then remain independent of C1 position in this ﬂ ight phase until the activating switch, in this example SW 9, is again "OFF".

"Auto. C1 Pos." has precedence over all other ﬂ ightphase switches.

Corresponding parameter settings for …

pitch servos• throttle servo• tail rotor servo• swashplate rotation, if available• gyro setting•

… are made in the "Helicopter mixer" menu, see page 64.

Cut-off

Within the framework of autorotation settings for the mx-20 HoTT transmitter's helicopter program, there are parameters for an emergency "cut off" of the throttle servo or motor actuator, refer to the programming proposal on page 286. However, this option is not available if an idle position is speciﬁ ed in the "Thr setting AR" line of the "Helicopter mixer" menu instead of an (emergency) OFF position; for example, to avoid restarting the motor after every landing during autorotation practice. In this case it is better to use this option as a "cut off" rather than as an emergency OFF solution.

Depending on the "forw./back" choice made for the "Pitch min" line of the "Heli Type" menu, this motor "cut off" option can be coupled to a switch for throttling down a carburetor servo to the cut-off (or idle) position.

This cut-off (or idle) position is speciﬁ ed by the left

Detail program description - Base setup model | Helicopter

column over the "SEL" ﬁ eld and its value is to be established through trial and error.

If the percentage value speciﬁ ed for the middle • column is less than the current servo position, i. e. the current servo position is above the threshold, the speed controller will initially reduce motor speed or close the carburetor's throttle servo only to the extent dictated by the value in the left column as soon as the servo's position once underruns the threshold (max. +150 %) after the switch is changed over to its ON position.

The speed controller or throttle servo will remain in this cut-off position only until the selected switch is again changed over followed by a one-time throttle servo or speed controller movement beyond the preset threshold with the throttle/brake joystick control.

The factory setting for the left column is -100 % for the throttle servo "cut-off" position and a threshold of +150 % servo position setting in the middle column.

BASIC SETTINGS, MODEL

DSC Output Autorotation Auto.C1 Pos. cut off +150%–100%

SEL

PPM10

-55%

STO

–––

BASIC SETTINGS, MODEL

DSC Output Autorotation Auto.C1 Pos.

cut off

–125%

SEL

PPM10

-55%

+100%

STO

–––

Programming

To change the preset "cut-off" position of the throttle servo, press the center SET button in the right touch pad. The current setting will be displayed in inverse video. Now use the arrow keys of the left or right touch pad to set a value at which the motor is reliably "off" without a startup of the throttle servo. For example

-125 %:

BASIC SETTINGS, MODEL

DSC Output Autorotation Auto.C1 Pos.

–125%cut off

SEL

The – upper – preset value in the middle column ensures the motor can be stopped, throughout the maximum possible positioning range of the servo or speed controller, alone by the switch to be assigned in the right column.

However, if you wish to set a lower threshold, by which an underrun will cause the throttle servo or speed controller with closed switch to switch into the cut-off position, reduce the preset servo travel and - if applicable, the throttle limiter - by placing the throttle/ pitch joystick into the desired position then press the center SET button in the right touch pad.

Detail program description - Base setup model | Helicopter

PPM10

-55%

+150%

STO

–––

Finally, use the column at the right to specify a switch with which you can cut off the motor directly (emergency) or which will be activated by the threshold.

BASIC SETTINGS, MODEL

DSC Output Autorotation Auto.C1 Pos. cut off

Notices:

Be sure the throttle servo does not run out • mechanically when the cut-off function is activated.

–125% 1

SEL

PPM10

-55%

+100%

STO

–––

Your notes

Model type

Establishing winged aircraft model type

This "Model type" menu is used to establish the type of model to be programmed. This also activates all characteristic mixers, coupling functions, etc. in preparation for subsequent programming of the speciﬁ ed model type.

Suppress model

Base setup model

Model type

Servo adjustment Stick mode. Control adjust

Press brieﬂ y on the center SET button in the right touch pad.

Motor at C1

After selecting the "Motor at C1" line with the  arrow keys of the left and right touch pad, the corresponding entry ﬁ eld will be framed.

M O D E L T Y P E Motor at C1 Tail type Aile/flaps Brake Off In 1+100%

Press brieﬂ y on the center SET button in the right touch pad. The current setting will be displayed in inverse video. Now use the arrow keys of the right touch pad to select from among the following four options:

"none" For operation of a model without a

propulsion.

The warning "Throttle too high", see

page 36, is deaktivated and the "Brake

None

Normal

1AIL

SEL

settings" sub-menu of the "Wing mixers" menu (beginning page 146) is

available without any restrictions.

"back": The idle position for the throttle/brake

ﬂ aps control stick (C1) is to the rear, i. e. toward the pilot.

The warnings "Throttle too high", see

page 36, as well as the "cut off" option in the "Basic settings, model" menu, see page 72, are activated and the "Brake settings" sub-menu of the "Wing mixers", beginning page 146, will be available if the entry in the "Motor" column of the "Phase settings" menu, page 128 for the currently active ﬂ ight phase contains "none".

"forw.": The idle position for the throttle/brake

ﬂ aps control stick (C1) is at the front, i. e. away from the pilot.

The warnings "Throttle too high", see

page 36, as well as the "cut off" option in the "Basic settings, model", see page 72, are activated and the "Brake settings" sub-menu of the "Wing mixers", beginning page 146, will be available if the entry in the "Motor" column of the "Phase settings" menu, page 128 for the currently active ﬂ ight phase is "none".

Notice:

Be sure to pay attention during the programming • procedures that motors do not start up unintentionally. Disconnect the fuel supply or battery terminals to motors before programming.

C1 trimming will operate according to your choice • between "normal" or only "back" or "fwd.", that is, either over the control's entire travel path or only in the respective idle direction.

Pay attention to the "• cut off trim" function described on page 54.

Tail type

After selecting the "Tail type" line with the  arrow keys of the left or right touch pad, the corresponding entry ﬁ eld will be framed.

M O D E L T Y P E Motor at C1 Tail type Aile/flaps Brake Off In 1

Press brieﬂ y on the center SET button in the right touch pad. The current setting will be displayed in inverse video. Now select the type applicable to your model with the arrow keys of the right touch pad.

"normal": Elevators and rudder are each operated

by a single servo.

"V-tail": Elevator and rudder control is affected

by way of two separate, articulated, V-shaped rudders. The coupling function for rudder and elevator control will be automatically taken over by the program. The relationship of rudder-to-elevator proportion is set in the "Dual Rate / Expo" menu, page 108 and servo travel in the "Servo adjust" menu, page 90.

If differentiated rudder throw is also

desired then the V-tail should be

+100%

None

Normal

1AIL

SEL

Detail program description - Model type

controlled instead by way of the "Dual mixer" menu, page 194. In this case however, the tail type entry speciﬁ ed here must be "normal".

"Delta/ﬂ ": Aileron and elevator control is operated

by one or two servos per wing half. However, elevator trimming is also affected by selecting the "QR 2WK" option – see below – but only on servos 2 & 3.

"2HRSv3+8": This option is intended for models

with two elevator servos. The servo connected to output 8 will operate in parallel with servo 3 to actuate elevators. Elevator trimming affects both servos.

Notice about the "2HRSv3+8" option: One control, which assigns input 8 by way of the "Control adjust" menu, is then disconnected from servo "8" by software for reasons of safety i. e. it is made ineffective.

Aileron/Flaps

After selecting the "Aile/ﬂ aps" line with the  arrow keys of the left or right touch pad, the corresponding entry ﬁ eld will be framed.

M O D E L T Y P E Motor at C1 Tail type Aile/flaps Brake Off In 1

Press brieﬂ y on the center SET button in the right touch pad. The current setting will be displayed in inverse

+100%

None

Normal

1AIL

SEL

video. Now use the arrow keys of the right touch pad to select the number of wing servos to be programmed for the model.

Available Control channel used

1QR 2

1QR 1WK 2 | 6

2QR 2 + 5

2QR 1WK 2 + 5 | 6

2QR 2WK 2 + 5 | 6 + 7

2QR 4WK 2 + 5 | 6 + 7 / 9 + 10

4QR 2WK 2 + 5 / 11 + 12 | 6 + 7

4QR 4WK 2 + 5 / 11 + 12 | 6 + 7 / 9 + 10

Depending on the option selected here, the given mixers needed and their settings will be activated in the "Wing mixers", menu beginning page 146.

Tips:

Settings for all wing ﬂ ap pairs (QR and QR2, WK and • WK2) can be trimmed on a ﬂ ight-phase basis in both the "Phase trim" menu and in the "Wing mixers" menu, page 146.

The functionality of all wing ﬂ ap pairs (QR and QR2, • WK and WK2) can also be operated by way of the "Throttle/brake-ﬂ ap stick" if this stick has not been assigned to other use, e. g. for certain brake settings, see "Wing mixers" menu, page 146. To conﬁ gure this it is only necessary to assign "Control 1" to input 6 in the "Control adjust" menu, page 96. (If you would rather operate ﬂ aps with switches, one of the transmitter's two or three position switches are good for this purpose.)

Brake offset

This function not only has potential for gliders and electric models but also for models with combustion motors and landing ﬂ aps.

The mixers described in the "Brake settings" line of the "Wing mixers" menu can be operated by the C1 control stick ("input 1") or another transmitter operating element which has been assigned to input 7, 8 or 9 in the "Control adjust" menu. In this latter case, retain the "GL" default setting for the "Type" column in the "Control adjust" menu so the selected control can operate independent of ﬂ ight phase.

In the majority of cases the default setting for "input 1" will remain as it is and the brake will be operated by way of the non-neutralizing C1 joystick.

However, use of input 7, 8 or 9 makes it possible to operate the brake in an alternative manner, even by way of a supplementary control, if the C1 stick is to be used for something else.

The neutral point (offset) can be set to any desired position. This is done by placing the control for input 1, 7, 8 o 9 into the position at which the landing ﬂ aps are to be in their neutral position then ﬁ xing this "Offset" point there with STO.

M O D E L T Y P E Motor at C1 Tail type Aile/flaps Brake Off In 1

If the offset point is not set at the far end of control element travel, the remainder of travel to the end point will be "free travel", i. e. this "free travel" will no longer

Detail program description - Model type

+90%

None

Normal

1AIL

SELSTO

inﬂ uence any mixer available for "Brake settings" in the "Wing mixers" menu. This free travel ensures that, even if the brake ﬂ ap control is not quite positioned to its full end of travel, it will still stop all brake settings at "neutral". At the same time, the effective control path is automatically spread to 100 %.

Tip: Preferably, the servo intended for operating any airbrake ﬂ aps that may be on the model should be connected to the receiver output operated by the brake input channel, e. g. connect airbrake servo onto (free) receiver output 8 if input 8 has been chosen for the "brake", etc. A second airbrake servo is most conveniently operated by way of a free mixer.

Detail program description - Model type

Your notes

Helicopter type

Establishing helicopter model type

Suppress models

Base setup model

Helicopter type

Servo adjustment Stick mode Control adjust

Press brieﬂ y on the center SET button in the right touch pad.

Swashplate type

Control of the swashplate will require an appropriate program variant which corresponds to the number of servos operating pitch control.

After selecting the "Swashplate" line with the  arrow keys of the left or right touch pad, the corresponding entry ﬁ eld will be framed.

HELI TYPE Swashplate Linear. swashpl. Rotor direct Pitch min. back

Press brieﬂ y on the center SET button in the right touch pad. The current setting for number of pitch servos will be displayed in inverse video. Now choose the variant needed with the arrow keys of the right touch pad.

1 Servo

right

SEL

"1 Servo": The swashplate will be tipped with one

servo each for roll and nick. Pitch control will be affected by a separate servo.

(Since helicopter models operated

with only 1 pitch servo will be operated WITHOUT the transmitter's mixer functions for pitch, nick and roll, the "Swashplate mixer" menu item in the Multifunction menu will be hidden.)

"2 Servos": Two roll servos will displace the

swashplate axially to affect pitch control; nick control will be decoupled by a mechanical compensation rocker.

"3Sv (2Roll)": Symmetrical three-point control of

the swashplate is affected at three articulation points, each radially offset from the others by 120°, which are connected to one nick servo (at the front orrear) and two roll servos (located laterally at the left and right). All three servos push the swashplate axially to affect pitch control.

"3Sv (140)": Asymmetrical three-point control of

the swashplate is affected at three articulation points connected to one nick servo (rear) and two roll servos (front left and right). All three servos push the swashplate axially to affect pitch control.

"3Sv (2Nick)": Symmetrical three-point control as

described above but radially offset by 90°, one lateral roll servo and two nick servos, front and rear.

"4Sv (90°)": Four-point swashplate control affected by

two roll servos and two nick servos.

Simultaneously pressing the  or  keys of the right touch pad (CLEAR) will set the option back to "1 Servo".

Swashplate type: 1 Servo

Swashplate type: 2 Servos

Swashplate type: 3 Servos (2 Roll)

Swashplate type: 3 Servos (140°)

Detail program description - Helicopter type

Swashplate type: 3 Servos (2 Nick)

Swashplate type: 4 Servos (90°) 2 Nick / 2 Roll

Notice: Except for the "1 Servo" choice, swashplate mixer proportions must also be set in the "Swashplate mixer" menu, page 196.

Swashplate linearizing

After selecting the "Linear. swashpl." line with the

 arrow keys of the left or right touch pad, the corresponding entry ﬁ eld will be framed.

HELI TYPE Swashplate Linear. swashpl. Rotor direct

3Sv(2rol)

right

Pitch min. back

SEL

The "yes" entry will prevent undesired side effects such as pitch change due to a roll function or tension between swashplate servo rods.

This type of tension can arise when effected servos

strain for different displacement positions due to travel which deviates from one another.

Linearizing will require a bit of familiarization on the part of the pilot because, in order to linearize the entire rotation travel for the servo arm, servo travel can be appropriately reduced for small control movements – similar to a substantial Expo setting – .

Rotor rotation

After selecting the "Rotor direct" line (rotor direction) with the  arrow keys of the left or right touch pad, the corresponding entry ﬁ eld will be framed.

HELI TYPE Swashplate Linear. swashpl. Rotor direct

3Sv(2rol)

right

Pitch min. back

SEL

Once the choice for main rotor rotation direction is made with the arrow keys, it is set by pressing the center SET button in the right touch pad.

"right": The main rotor turns clockwise when viewed

from above.

"left": The main rotor turns counter-clockwise when

viewed from above.

Simultaneously pressing the   or  keys of the right touch pad (CLEAR) will set the option to "right".

right-hand

rotation

left-hand rotation

This entry is necessary for correct operational orientation of the torque and power compensation mixer settings made in the "Helicopter mixer" menu:

Pitch, C1  throttle, C1  tail rotor, Tail rotor  throttle, Roll  throttle, Roll  tail rotor, Pitch  throttle, Nick  throttle, Nick  tail rotor.

Pitch min

After selecting the "Pitch min" (pitch minimum) line with the  arrow keys of the left or right touch pad, the corresponding entry ﬁ eld will be framed.

HELI TYPE Swashplate Linear. swashpl. Rotor direct

3Sv(2rol)

right

Pitch min. back

SEL

Detail program description - Helicopter type

The "Pitch min" line is used to adapt the direction of operation for the throttle/pitch control stick to your control preferences. All other helicopter program options which involve throttle and pitch functions, e. g. throttle curve, idle trimming, tail rotor mixer, etc., are dependent on this setting.

Press the center

SET button in the right touch pad.

The operating direction of the throttle/pitch joystick will be displayed in inverse video. Now choose the variant needed with the arrow keys of the right touch pad.

Pitch

These mean: "fwrd.": minimum pitch setting when the pitch joystick

(C1) is "forward", i.e. away from the pilot.

"back": minimum pitch setting when the pitch joystick

(C1) is "back", i.e. toward the pilot.

Simultaneously pressing the  or  keys of the right touch pad (CLEAR) will set this option to "rear".

Notices:

C1 trimming affects only the throttle servo. •

The so-called "throttle limiter" is set by default, see text • beginning page 104, such that the throttle limiter for full throttle can be set independently of the pitch servo via input "Th.L.12" in the "Control adjust" menu.

Detail program description - Helicopter type

Since your models will typically be operated with the • same pitch-min direction, this speciﬁ cation can be conveniently preselected in the "transmitter-speciﬁ c" "Basic Settings" menu, page 224. This speciﬁ cation will be adopted automatically when a new model memory is created in the "Helicopter type" menu but, if desired, can be adapted on a model-speciﬁ c basis as described.

Expo throttle limit

After selecting the "Expo thro lim."line with the

 arrow keys of the left or right touch pad, the corresponding entry ﬁ eld will be framed.

HELI TYPE Linear. swashpl. Rotor direct

right Pitch min. back Expo thro lim. 0%

SEL

The "Throttle limit" function, described in the text for the "Control adjust" menu on page 104, can be assigned an exponential characteristic curve.

A pitch progression rate value between -100 % and +100 % can be set with the arrow keys.

For example, this is meaningful when the throttle limiter is to be regulated in parallel with the idle setting. Further details about the throttle limiter can be found in the text for the "Control adjust" menu on page 100.

An example of two Expo throt-

tle limit curve characteristics

for 100 % servo travel.

continuous line:

negative expo values;

dashed line:

positive expo values

 # 



  

&  $ 

" 



       "    $  &      

Your notes

Servo adjustment

Servo direction, midpoint, travel and limit

This menu is used to set the direction, neutralization, travel and limit parameters for a given selected servo exclusively.

Suppress models

Base setup model

Model type

Servo adjustment

Stick mode Control adjust

Brieﬂ y press the center SET button in the right touch pad.

S1 S2 S3 S4 S5

Rev cent

Begin setting servo parameters in the left column.

Basic procedure steps:

Select the desired servo, S1 ... S12, with the 1.  arrow keys of the left or right touch pad.

If necessary, use the 2.  arrow keys of the left or right touch pad to reach the desired column then, if desired, move the respective control out of its midpoint to make an asymmetric setting.

Brieﬂ y press the center 3. SET button in the right touch pad. The respective entry ﬁ eld will be displayed in inverse video.

Use the 4. arrow keys of the right touch pad to set the desired value.

Brieﬂ y press the center 5. SET button in the right touch

0% 0% 0% 0% 0%

100% 100% 100% 100% 100%

trv

pad to complete the entry. Simultaneously 6. pressing the  or  keys of

the right touch pad (CLEAR) will set any setting which has been made back to the given default value.

Important: Servo designation numerals are based on the respective receiver outputs to which they are connected, provided that no swapping of transmitter and/or receiver outputs has been speciﬁ ed. This means that even a change of stick mode will not effect the numbering of servos.

Column 2 "rev"

The direction in which a servo turns is adapted to the practical reality of the given model so that the assembly of control rods and joints do not need to accommodate a speciﬁ c servo rotation direction. Rotation direction is symbolized by the "=>" and "<=" character combinations. Servo rotation direction must be speciﬁ ed before making settings for the options which follow below.

Simultaneously pressing the  or  keys of the right touch pad (CLEAR) will reset the rotation direction to "=>".

normal

reversed

Column 3 "midpoint"

The servo midpoint setting is intended for adapting a non-standard servo (a servo whose midpoint position does not correspond to a pulse length of 1.5 ms, i.e. 1500 µs), as well as for minor adjustments, e. g. for the ﬁ ne tuning of the neutral position of model rudders.

Independent of trim levers and any mixer settings, the neutral point can be set in a range of -125 % to +125 % within a maximum servo travel scope of ±150 %. Independent of all other trim and mixer settings, this setting is always based directly on the respective servo.

Note that extreme adjustments of the neutral point can lead to one-sided restrictions of servo motion because both the electronic and the mechanical aspects limit total travel to ±150 %.

Simultaneously pressing the  or  keys in the right touch pad (CLEAR) will reset the entry ﬁ eld displayed in inverse video back to its "0 %" value.

Column 4 "- Weg +"

This column is used to set servo travel symmetrically or asymmetrically for each side. The setting range is 0 … 150 % of normal servo travel. The values set are based on the settings that have been made for the "midpoint" column.

To create a symmetric travel path, i. e. controlside independent travel,

the respective control (joystick, proportional rotary control or switch) is to be put into the position which covers travel to both sides of the marked

Detail program description - Servo adjustment

frame.

Notice: It may be necessary to ﬁ rst assign a control to a servo attached to one of the 5 ... 12 control channels. If necessary, this is to be done in the "Control adjust" menu, see page 96 or 100.

To create an asymmetric travel path, the respective control (joystick, proportional rotary control or switch) is to be moved to the side to be set such that it covers only the marked frame.

The value setting is activated by brieﬂ y pressing the

SET button in the right touch pad. The value

center ﬁ eld will be displayed in inverse video. Values can be changed with the arrow keys of the right touch pad. Pressing the center

SET button in the right touch pad

will complete the entry. Simultaneously pressing the  or  keys in

the right touch pad (CLEAR) will reset the changed parameter in the entry ﬁ eld back to 100 %.

Important: In contrast to settings made with the "Control adjust" menu, all settings made in this menu affect exclusively the respective servo, independent of how the control signal for this servo is produced, i.e. directly by a control stick or by way of any mixer functions.

Servo travel

The adjacent ﬁ gure shows and example of a side-dependent servo setting, -50 % and +150 %.

Transmitter control travel

Column 5 "limit"

The "- lim +" column is reached by pushing the marked frame with the  arrow key of the left or right touch pad, analogous to the pointers at the bottom of the screen, to the right beyond the "- trv +" column.

S1 S2 S3 S4 S5

Rev cent

0% 0% 0% 0% 0%

150% 150% 150% 150% 150%

lim

To create a symmetric, i. e. control-side independent limit, the respective control (joystick, proportional rotary control or switch) is to be put into the position in which the marked frame covers both sides of the travel setting.

To set asymmetric travel, the respective control (joystick, proportional rotary control or switch) is to be moved to the side on which the marked frame only includes the value to be changed.

Simultaneously pressing the  or  keys in the right touch pad (CLEAR) will reset the entry ﬁ eld displayed in inverse video back to its "0 %" value.

Example: A servo is controlled separately by two controls over a mixer and but, for model-speciﬁ c reasons, must only be operated over a servo travel path of 100 % because, for example, the rudder would mechanically collide with the elevator if moved more than 100 %.

As long as only one control is used at a time, this is no problem. But this does become a problem when the signals of both controls (e. g. aileron and rudder) combine to form an overall travel in excess of 100 %. The linkage and servos could be strained excessively …

To prevent this, the travel should certainly be limited by way of an individual travel limit. In the case of the rudder used in the example, this would be a value slightly less than 100 % – because it is assumed the rudder would collide at 100 % – .

Detail program description - Servo adjustment

Joystick setting

Setting stick mode 1 through 4

Both joysticks are equipped for digital trimming. With each brief push (one "click") on a joystick it will change its neutral position by one increment. Holding the stick longer will cause trimming to run in the corresponding direction at increasing speed.

The current position is shown on the screen and adjustment is also made "audible" by various high frequency tones. This makes ﬁ nding the mid-point during ﬂ ight easy, without looking at the screen. If the mid-point is overrun, a brief motion pause will be inserted.

Current trim values are automatically stored when a model memory change is made.

Furthermore – except for trimming the throttle/brake joystick, commonly referred to as control function "C1" (channel 1) – digital trimming is effective within a model memory location selectively as either a global parameter (i. e. consistent in all ﬂ ight phases) or as a ﬂ ight-phase speciﬁ c parameter. This speciﬁ cation as "global" or "phase" is made in the "Joystick setting" menu described here, whereas C1 trimming is always made "globally", i. e. independent of ﬂ ight phases.

This setting is visualized in the base screen by a "shadow" on trim bars:

shadow present = global,• no shadow = ﬂ ight phase dependent.•

The following ﬁ gure shows elevator trim – in the right column with standard Mode 1 – as being ﬂ ight-phase dependent.

Detail program description - Joystick setting

0.0s

time

0:00 0:00

HoTT

5.5V

0.0s

GRAUBELE

#01

«Normal »

5.2V

2:22h

Scroll with the arrow keys of the left or right touch pad to the "Stick mode" menu item of the multifunction menu.

Servo adjustment

Stick mode

Control adjust Dual Rate / Expo Channel 1 curve Switch display

Open this menu item by pressing the center SET button in the right touch pad.

Ch.1 Aile Elev Rudd

This menu, adapted for winged models, permits the trim effects of the four digital trim levers to be established and control functions 1 through 4 to be selectively "decelerated".

The desired line can be reached by using the arrow keys of the left or right touch pad. Once the appropriate function ﬁ eld has been selected and then the center

SET button in the right touch pad is pressed brieﬂ y, the

ﬁ eld will appear in inverse video and the desired setting

GL GL GL GL

Stop Flt

K78

4 4 4 4

can be made with the arrow keys of the right touch pad.

Column "Tr" (trim)

Except for "channel 1", this column can be used to switchover trim effect from "GL(obal)" to "PH(ase)" and vice versa. For example:

Ch.1 Aile Elev Rudd

"GL": The position of the respective trim lever

is effective for the given model "globally", i.e. across any ﬂ ight phases which may be programmed for it, page126.

"PH": The position of the respective trim lever is

effective on a phase-speciﬁ c basis and will be automatically stored upon change of ﬂ ight phase so that the setting is again available following a return to this ﬂ ight phase.

Simultaneously pressing the  or  keys of the right touch pad (CLEAR) switches the entry back to "GL".

Column "St" (trim steps)

The four digital trim levers push the neutral point of the respective joystick by one increment for each press ("click"). This is where the increment size (step) can be adjusted for a given direction, whereby maximum trim travel, independent of the selected number of trim steps, is always about ±30 % of control travel.

After selecting column "St" (Steps) and then the desired trim control with the  arrow keys of the left or right

GL GL

4 4 4 4

0.0s

time

0.0s

touch pad, the corresponding entry ﬁ eld will be framed. For example:

Ch.1 Aile Elev Rudd

Brieﬂ y press the center SET button in the right touch pad. The current setting will be displayed in inverse video. Now select the desired value, between 1 and 10, with the arrow keys of the right touch pad. For example:

GL GL GL GL

4 4 4 4

0.0s

time

0.0s

sides or separate for each control direction. This setting has a programmable range of 0 s to 9.9 s. In the case of side-separate settings, the joystick is to be moved to the respective side so that the inverse video ﬁ eld will switch between sides to the one for which the change is to be made, – for example, even to ensure gentle rev-up of the propulsion motor despite a (too) fast motion of the C1 stick.

Ch.1 Aile Elev Rudd

GL GL GL GL

4 4 4 4

0.0s

1.1s

0.0s

Ch.1 Aile Elev Rudd

Simultaneously pressing the  or  arrow keys of the right touch pad (CLEAR) will reset the change made in the active ﬁ eld back to "4".

Column "time"

The "time" column entries inﬂ uence joystick acceleration speed/s – if applicable, for each movement direction for the four control sticks, 1 through 4, separately – . This means that respective servos will then follow rapid control position changes only at an accordingly delayed rate. This time delay has a direct effect on the control function and therefore also any servos controlled by this function.

The time can be programmed symmetrically for both

GL GL GL GL

4 4

0.0s

time

0.0s

On the other hand, for reasons of safety, the motor cutoff should always be "immediate".

Simultaneously pressing the  or  keys of the right touch pad (CLEAR) will reset the change made to the active ﬁ eld back to "0.0 s".

time

Detail program description - Joystick setting

Joystick setting

Setting stick mode 1 through 4

Current trim values are automatically stored when a model memory change is made.

Furthermore – except for trimming the throttle/brake joystick – digital trimming is effective selectively either as a global parameter, i. e. consistent in all ﬂ ight phases, or as a ﬂ ight-phase speciﬁ c parameter. This speciﬁ cation as "global" or "phase" is made in the "Joystick setting" menu described here, whereas throttle trimming is always made "global" by software, i. e. independent of ﬂ ight phases.

This setting is visualized in the base screen by a "shadow" on trim bars:

shadow present = global,• no shadow = ﬂ ight phase dependent.•

In the following ﬁ gure nick trimming is used as an example of ﬂ ight-phase dependence – presented in its default Mode 1 at the left – .

STARLET

#02

«Normal »

5.2V

2:22h

Stop Flt

K78

0:00 0:00

HoTT

5.5V

Scroll with the arrow keys of the left or right touch pad to the " Stick mode " menu item of the multifunction menu.

Model select Copy / Erase

Suppress menus

Suppress models Base setup model Model type

Open this menu item by pressing the center SET button in the right touch pad.

Model select Copy / Erase

Suppress models

Base setup model Model type Suppress: TOG

This menu, adapted for helicopter models, permits the trim effects of the four digital trim levers to be established and control functions 1 through 4 to be selectively "decelerated".

The desired line can be reached by using the arrow keys of the left or right touch pad. Once the appropriate function ﬁ eld has been selected and then the center

SET button in the right touch pad is pressed brieﬂ y, the

ﬁ eld will appear in inverse video and the desired setting can be made with the arrow keys of the right touch pad.

Column "Tr" (trim)

These setting variations are conﬁ gured to accommodate the needs of helicopter models, which is why the following alternative options are available for the "Thr." line:

Ch.1 Aile Elev Rudd

"TL": "throttle limit" C1 trimming operates as idle trimming when

the "throttle limit" function regulates the motor for starting, see "Control adjust" menu,

page 104. "AR": "autorotation throttle" C1 trim operates as idle trim exclusively in the

"Autorot" ﬂ ight phase. This makes it possible to assign a principle

(ﬁ xed) preset AR throttle position in the

"Helicopter mixer" menu, page 164, e. g. for

use during autorotation practice, which can be

"varied" with the idle trim lever. Simultaneously pressing the  or 

keys of the right touch pad (CLEAR) will

switch this option back to "TL". On the other hand, the trim effects of respective digital

trimming controls for the lines "Roll", "Nick" and "Tail rotor" can be switched over from "GL" to "PH" and vice versa. Example:

Thr. Roll Nick Tail

GL GL

TL GL GL

4 4 4 4

0.0s

time

0.0s

Detail program description - Joystick setting | Helicopter model

"GL": The position of the respective trim lever

is effective for the given model "globally", i.e. across any ﬂ ight phases which may be programmed for it, page 126.

"PH": The position of the respective trim lever is

effective on a phase-speciﬁ c basis and will be automatically stored upon change of ﬂ ight phase so that the setting is again available following a return to this ﬂ ight phase.

Simultaneously pressing the  or  keys of the right touch pad (CLEAR) will switch the entry back to "GL".

Column "St" (trim steps)

After selecting column "St" (Steps) and then the desired trim control with the  arrow keys of the left or right touch pad, the corresponding entry ﬁ eld will be framed. Example:

Thr. Roll Nick Tail

Brieﬂ y press the center SET button in the right touch pad. The current setting will be displayed in inverse video. Now select the desired value, between 1 and 10,

TL GL GL PH

0.0s

0.0s 4 4 4

0.0s

time

0.0s

with the arrow keys of the right touch pad. For example:

4 4

0.0s

time

0.0s

Thr. Roll Nick Tail

Simultaneously pressing the  or  keys of the right touch pad (CLEAR) will reset any change made to the active ﬁ eld back to "4".

Column "time"

The "time" column entries inﬂ uence joystick acceleration speed/s – if applicable, for each movement direction for the four control sticks, 1 through 4, separately – . This means that respective servos will then follow rapid control position changes only at an accordingly delayed rate. This time delay has a direct effect on the control signal and therefore also commensurately on any servos controlled by the effected controls.

The time can be programmed symmetrically for both sides or separate for each control direction. This setting has a programmable range of 0 s to 9.9 s. In this latter case, the given stick control is to be moved to the respective side so that the inverse video ﬁ eld will switch between sides to the one for which the change is to be made.

Example: All three servos are to be actuated for swashplate pitch control, e g. a "Pitch" control movement for a "3Sv (2Roll)" swashplate. However, travel for the middle servo is greater than that of the other two servos on the shorter lever.

TL GL GL PH

A rash "Pitch" control movement would not operate the nick servo in the middle as quickly as it would the two roll servos on the shorter lever. This would cause a momentary control motion in the "nick" direction. However, if response time for the "pitch" control function were to be reduced by at least the positioning time for the servo in the middle then all three servos would reach their proper positions at the same time. The necessary delay times typically amount to only a few tenths of a second. For example:

Thr. Roll Nick Tail

Simultaneously pressing the  or  keys of the right touch pad (CLEAR) will reset any change made to the active ﬁ eld back to "0.0 s".

TA GL GL

4 4 8 4

0.2s

0.0s

time

0.2s

0.0s

Detail program description - Joystick setting | Helicopter model

Control adjust

Fundamental operating steps for control and switch assignments

Servo adjustment Stick mode

Control adjust

Dual Rate / Expo Channel 1 curve Switch display

Brieﬂ y press the center SET button in the right touch pad.

Input 5 Input 6 Input 7 Input 8

normal

Aside from the two joysticks which operate control functions 1 through 4, a standard mx-20 HoTT transmitter is also equipped with other operating elements:

two 3 position switches: SW 4/5 or CTRL 9 and SW • 6/7 or CTRL 10. These are assigned in this menu as "Ct9" and "C10".

three proportional rotary controls: CTRL 6, 7 and 8. • Respectively designated "Ct6", "Ct7" and "Ct8" in the menu.

three 2 position switches: SW 2, 3 and 8. • Respectively displayed in the menu as "2", "3" and "8" in combination with a switch symbol indicating the switching direction.

two pushbutton switches: SW 1 and SW 9. Analogous • to the aforementioned switches; designated as "1" and "9" and displayed in combination with a symbol indicating switching direction.

GL GL GL GL

typ

––– ––– ––– –––

0% 0% 0% 0%

offset

In contrast to the two joysticks which, when initialized for a new model memory as a "Winged aircraft" model type will already be conﬁ gured to operate the servos connected to receiver outputs 1 … 4, these "other" operating elements initially remain inactive.

Thus, at least in the system's delivered state, – as already mentioned on page 20 – or even after the initialization of a new model memory with the "Winged aircraft" model type and its "binding" to the intended receiver, only those servos connected to the two joysticks by way of receiver outputs 1 … 4 are able to be operated; any servos which may be connected to the receiver's outputs 5 … 12 will initially remain inactive in their middle positions.

Even though this may seem inconvenient at ﬁ rst glance, it is indeed just this state which offers full freedom to select and assign these "other" operating elements as desired and leaves any unused operating elements harmlessly dormant without taking any action to deactivate them. This has the advantage that:

An unused operating element will have no inﬂ uence on your model's operation even if inadvertently operated; it will be inactive and therefore have no assigned function.

These "other" operating elements can be freely assigned to meet your needs and the features of your model. They can be assigned to any function input in the "Control adjust" menu, see page 50. But this also means that each of these operating elements can also be assigned to multiple functions at the same time. For example, one and the same toggle switch, SW X, assigned in this menu to an input, can at the same time be assigned to a "timer" as an On/Off switch in the "Timers (general)" menu...

Furthermore, all inputs can be selectively made global or ﬂ ight-phase speciﬁ c (providing that ﬂ ight phases have been deﬁ ned in the menus "Phase settings", page 128, and "Phase assignment", page 134). The respective names for the given ﬂ ight phases will then appear in the bottom screen line, e. g. "normal".

Basic procedure steps

Select the desired input, E5 ... 12 with the 1.  arrow keys of the left or right touch pad.

If necessary, use the 2.  arrow keys of the left or right touch pad to change to the desired column.

Brieﬂ y 3. press the center pad. The respective entry ﬁ eld will be displayed in inverse video.

Actuate the desired operating element or use the 4. arrow keys of the right touch pad to set the desired value.

Brieﬂ y5. press the center SET button in the right touch pad to complete the entry.

Simultaneously 6. pressing the  or  arrow keys of the right touch pad (CLEAR) will reset any setting change back to its default value.

SET button in the right touch

Detail program description - Control adjust

Column 2 "typ"

Analogous to the "Stick mode" menu already described, this column can be used to select whether other settings are to be made for the given input, e. g. "GL(obal)" or "PH(ase speciﬁ c)" and vice versa.

Input 5 Input 6 Input 7 Input 8

normal

"GL": The given input's settings will be "globally"

effective for the respective model memory across any ﬂ ight phases which may be programmed.

"PH": The settings for this input will be effective on

a ﬂ ight-phase basis and must therefore be explicitly set in each ﬂ ight-phase where it is to be effective.

Notice: More about ﬂ ight phases on page 126.

Column 3 "Control or switch assignment"

Use the  arrow keys of the left or right touch pad to select one of the inputs, 5 through 12.

Brieﬂ y press the center SET button in the right touch pad to activate the assignment.

GL GL GL GL

typ

––– ––– ––– –––

0% 0% 0% 0%

offset

Input 5 Eing. 6

Move desired switch

Eing. 7

or control adj.

Input 8 Normal

Now activate the desired control (CTRL 6 through 10) or selected switch (SW 1 through 3, or 8 or 9) - whereby a proportional rotary control will only be detected after some "detenting" action has taken place and so may have to be activated a bit longer. If adjustment travel is insufﬁ cient, activate the control in the other direction.

Two position switches can only switch back and forth between their ﬁ xed end states, e. g. motor ON or OFF. On the other hand, the 3 position switches, SW 4/5 or 6/7, that can be incorporated in this "Control adjust" menu as "Ct9" or "C10", also offer a middle position.

Simultaneously pressing the  or  keys of the right touch pad (CLEAR) for an active control or switch assignment – see ﬁ gure above – will reset the input back to its "free" state.

Tips:

When assigning switches, pay attention to the • desired switching direction and also that all unused inputs remain "free" or are again reset to "free" (if applicable, across all ﬂ ight phases). This is necessary to ensure that inadvertent actuations of these unused controls cannot cause malfunctions.

The travel setting described below allows the • appropriate end state to be established for an assigned switch.

For example, the screen will now show either the

GL GL GL GL

typ

––– ––– ––– –––

0% 0% 0% 0%

offset

control's number or – in conjunction with a switch symbol indicating the switching direction – the switch's number .

Input 5 Input 6 Input 7 Input 8 Normal

Column 4 "offset"

The control midpoint for the given control, i. e. its zero point, can be changed in this column. The adjustment range lies between -125 % and +125 %.

Input 5 Input 6 Input 7 Input 8 Normal

Simultaneously pressing the  or  keys in the right touch pad (CLEAR) will reset the entry ﬁ eld displayed in inverse video back to "0 %".

Column 5 "-travel+"

This column is used to set servo travel symmetrically or asymmetrically for each side. The setting range is ±125 % of normal servo travel.

Use the  arrow keys of the left or right touch pad to select one of the inputs, 5 through 12.

To set symmetric travel, i. e. control-side independent travel, the respective operating element (proportional rotary control or switch) is to be put into a position which

Detail program description - Control adjust

GL GL GL GL

typ

GL GL GL GL

typ

–––

3 Ct6 –––

–––

3 Ct6 –––

0% 0% 0% 0%

offset

0% 0% 0% 0%

offset

covers travel to both sides of the marked frame.

Input 5 Input 6 Input 7 Input 8 Normal

To set asymmetric travel, the respective control (proportional rotary control or switch) is to be moved to the side on which the marked frame only includes the value to be changed.

Input 5 Input 6 Input 7 Input 8 Normal

The value setting is activated by brieﬂ y pressing the center SET button in the right touch pad. The value ﬁ eld will be displayed in inverse video. Values can be changed with the arrow keys of the right touch pad.

Input 5 Input 6 Input 7 Input 8 Normal

+100% +100% +100% +100%

–travel+

+100% +100% +100% +100%

–travel+

+100% +100%

+100%

–travel+

+100% +100% +100% +100%

+100% +100%

+111%+111%

+100%

Input 5 Input 6 Input 7 Input 8 Normal

Another brief press of the center SET button in the right touch pad will complete the entry.

Negative and positive parameter values are possible in order to appropriately adapt the control's direction or effect.

Simultaneously pressing the  or  keys in the right touch pad (CLEAR) will reset the changes parameter in the inverse video entry ﬁ eld back to +100 %.

Important: In contrast to the servo travel setting, control travel setting effects all derived mixer and coupling functions, i. e. inﬂ uences all servos which can be actuated by way of the respective control.

Column 6 "time"

A symmetric or asymmetric time delay between 0 and

9.9 s can be applied to each of the 5 ... 12 function inputs.

Use the  arrow keys in the left or right touch pad to push the marker frame to the right, beyond the "-travel+" column.

To set a symmetric, (i. e. control-side independent) time delay, the respective operating element (proportional rotary control or switch) must be put into a position which covers time to both sides of the marked frame.

+100% +100%

+100%

–travel+

+100%

+88%+111%

+100%

Input 5 Input 6 Input 7 Input 8 Normal

To set an asymmetric time delay, the respective control (proportional rotary control or switch) is to be moved to the side on which the marked frame only includes the value to be changed.

Input 5 Input 6 Input 7 Input 8 Normal

Notice: Further suggestions for structuring timed ﬂ ows can be found in the section "Control of timed ﬂ ows" on page 266.

0.0

– time +

0.0

– time +

0.0

Detail program description - Control adjust

Control adjust

Basic procedure for transmitter control and switch assignment

Servo adjustment Stick mode

Control adjust

Dual Rate / Expo Channel 1 curve Switch display

Brieﬂ y tap the center SET key on the right touch pad:

Input 5 Throt Gyro Input 8 Input 9 Input10 Input11 Th.L.12

In addition to the two dual axis sticks for control functions 1 to 4, the mx-20 HoTT transmitter is equipped with other controls as standard:

Two 3-stage switches: SW 4/5 and CTRL 9, plus SW • 6/7 and CTRL 10. On this menu, these are assigned as "Ct9" and "Ct10".

Three proportional rotary controls: CTRL 6, 7 and 8. • Named as "Ct6", "Ct7" and "Ct8" on this menu.

Three 2-stage switches: SW 2, 3 and 8. Labeled • accordingly as "2", "3" and "8" on the menu. A switch icon indicating the switch direction is also shown.

Two push-button switches: SW 1 and SW 9. • Displayed as with the preceding switches, "1" and "9" with a switch icon indicating the switch direction.

Even with a newly-initialized model memory for the

––– 6 7

GL GL GL GL GL GL GL

typ

–––

Ct6

0% 0% 0% 0% 0% 0% 0% 0%

offset

"Helicopter" model type, the two dual axis sticks will – in the absence of further conﬁ guration – inﬂ uence only those servos connected to receiver outputs 1 … 4 and

6. Unlike these, the "additional" transmitter controls mentioned above are theoretically inactive at ﬁ rst. (The exception here is the CTRL 6 proportional rotary control (throttle limiter), which also affects servo 6.)

One of the effects of this is that (as mentioned back on page 20 ) with a factory-fresh unit, only the servos connected to receiver outputs 1 … 4 and –depending on the position of the throttle limiter– servo 6 can be moved using the two joysticks. (This also applies following the initialization of a new model memory with the "Helicopter" model type and its "binding" to the receivers to be installed in the model.) The servos connected to slots 5, 7 and 8, on the other hand, will simply stay "stuck" at their center points.

While this may appear more than a little awkward at ﬁ rst glance … this is the only way to ensure that you can select any of the "additional" transmitter controls as you wish and, in addition, do not need to waste time "disabling" control elements you do not require. This is because

the only way to ensure an unwanted control element has no effect on your model, even if operated by accident, is to make it inactive, i.e. unassigned to a function.

You can therefore use this "Control adjust" menu exactly as you wish, to assign the "additional" control elements as you want to any required function input; for further details, see page 50. Equally, this also means that you can assign individual transmitter controls to multiple functions at the same time, if required. As an example: the exact same rocker switch SW X that you

assign to an input on this menu can simultaneously be assigned to "Timers" on the "Timers (general)" menu as an "On/Off" switch, etc.

Note: As a rule, input 6 must kept "free" for a helicopter model. On this, see "Throttle" on the next double page.

Furthermore, if ﬂ ight phases have been deﬁ ned on the "Phase settings" menu (page 128) and "Phase assignment" menu (page 134), then all inputs must be set either as global or ﬂ ight phase-speciﬁ c. The names assigned to each of these ﬂ ight phases are then shown in the bottom line of the screen display, e. g. "Normal".

Basic procedure

Using the arrow keys 1.  on the left or right touch pad, select the input you want: Input 5, Throt 6, Gyro 7, Input 8 … 11 or Th.L.12.

If necessary, use the arrow keys 2.  on the left or right touch pad to select the column you want.

Brieﬂ y tap the center 3. The corresponding input ﬁ eld is shown highlighted.

Activate your chosen transmitter control or use 4. the arrow keys on the right touch pad to set your chosen value.

Brieﬂ y tap the center 5. SET key on the right touch pad to complete data entry.

If you 6. tap the  or  keys on the right touch pad at the same time (CLEAR), this will reset any settings made back to their respective default values.

Column 2, "typ"

Similarly to the "Stick mode" menu described previously, this column can be used to deﬁ ne whether further settings for the input in question are to have a

SET key on the right touch pad.

Detail program description - Control adjust

100

Graupner mx20 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual