Graupner mx20 User guide

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

+ 266 hidden pages

Graupner mx20 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual