Graupner mc-16, mc-20 Programming Manual

mc-16 / mc- 2 0 HoTT.1.en

mc-16

mc-20

Programming Manual

Table of contents

General notices

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

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

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

Safety notices and handling regulations for
Lithium-Ion (LiIo) and Lithium-Polymer (LiPo)

batteries .....................................................................8

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

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

Technical data .......................................................... 15

General operating notices

Transmitter ..........................................................16

Transmitter power supply...............................16

Charging the transmitter battery ....................16

Charging with automatic chargers .................16

Recommended chargers (accessory) ...........16

Removing the transmitter’s battery ................17

Inserting the transmitter’s battery ..................17

Battery operation timer .................................17

General charging notices ..............................17

Opening the transmitter housing ...................18

Lithium battery CR 2032 ...............................18

Stick conversions ...........................................19

Stick length adjustment .................................20

Transmitter neckstrap support bars ............... 20

Transmitter description

Front side.......................................................21

Face-side connectors

Charger socket .........................................22

DSC jack ..................................................22

Data jack ..................................................23

Headset connector ...................................23

Card slot ...................................................24

Mini-USB connector .................................25

Bottom side transmitter interior .....................26

Display and keypad .......................................28

Operating the “data terminal“ ........................29

Shortcuts ....................................................... 30

Concealed menu columns .............................31

Table of contents

2

Function fields in the display .........................32

Position indicator ...........................................32

Entry lockout ..................................................32

Warning notices .............................................33

HIDDEN MODE .............................................34

Language selection

VOICE .................................................34

Change of display language ................35

Firmware update via SD card ...................35

STICK CALIBRATION .............................. 36

Bluetooth initialisation ..............................37

Telemetry data display ................................... 38

Commissioning the transmitter ................................46

Downloading a firmware packet .........................48

Transmitter firmware updates .............................50

Restoring the transmitter software .....................52

Receiver initialization ...............................................54

Receiver power supply .......................................56

Receiver system power supply ...........................57

Receiver firmware updates .................................58

Backing up receiver settings ...............................62

Installation notices ...................................................64

Definitions of terms ..................................................66

Physical control, switch and control switch assign-

ments .......................................................................68

Digital trim ...............................................................70

Winged models ........................................................72

Receiver layout ...................................................73

Servos in wrong direction ...................................73

Helicopter models ....................................................74

Receiver layout ...................................................75

Program descriptions

mc

16 20*

Loading a new memory location ..............................76

»Model select« ....................................   79

»Copy / Erase« ....................................   80

»Suppress codes« ..............................   84

»Suppress models« ............................   85

»Base setup model«  

Winged model ....................................................86

“Binding” transmitter and receiver .................87

Range test .....................................................91

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

“Binding” transmitter and receiver .................95

Range test .....................................................99

»Model type« .......................................   104

»Helicopter type« ................................   108

»Servo adjustment« ...........................   112

»Stick mode«  

Winged model ..................................................114

Helicopter model ..............................................116

»Control adjust«  

Winged model ..................................................118

Helicopter model ..............................................122

Throttle limit function ...................................127

Basic idle setting .........................................127

Throttle limit in combination with “AR” in the

»Stick mode« menu ...................................129

»Dual Rate / Expo«  

Winged model ..................................................130

Helicopter model ..............................................134

»Channel 1 curve«  

Winged model ..................................................138

Helicopter model ..............................................141

»Switch display« .................................   144

»Control switches« .............................   145

»logical switches« ..............................   148

How is a flight phase programmed? ......................150

»Phase settings«  

Winged model ..................................................152

Helicopter model ..............................................156

»Phase assignment« ..........................   158

»Phase trim« (Winged model) .............   160

»Non-delayed channels«....................   161

»Timers (general)« ..............................   162

»Flight phase timers« .........................   166

What is a mixer? ....................................................169

»Wing mixers« ....................................   170

Model type: “1AIL” .............................................173

Model type: “1AIL 1FL” .....................................174

Model type: “2AIL” .............................................175

Model type: “2/4AIL 1/2/4FL” ............................177

(Max. 2 ailerons and 2 flaps with the
standard 8-channel

mc-16 transmitter)

»Helicopter mixer« .............................   188

Fine-tuning the throttle and collective

pitch curve ........................................................198

Autorotation setting ...........................................202

General notes on freely programmable mixers ......204

»Free mixers« .....................................   205

Linear mixers ....................................................208

Curve mixers ....................................................210

Examples ..........................................................213

»Mix active / phase« ...........................   215

»Mix-only channel« ............................   216

»Dual mixer« .......................................   218

»Swashplate mixer« ...........................   220

»Fail safe« ...........................................   220

»Teacher/Pupil«  

Connecting with a trainer lead ..........................222

Connection schematic ......................................225

Wireless HoTT system .....................................226

»Tx. output swap« ..............................   230

»Profi trim«  

Winged model ..................................................232

Helicopter model ..............................................234

»Trim memory«  

Winged model ..................................................236

Helicopter model ..............................................238

»Telemetry« .........................................   240

Important notices: .............................................240

SETTINGS & DATAVIEW..................................241

Satellite mode ..............................................250

Sensor(s) .....................................................251

SENSOR SELECT ...........................................252

RF ST ATUS VIEW ............................................253

VOICE TRIGGER .............................................254

»Channel Sequence« .........................   256

»Multichannel« ....................................   258

»Ring limiter« ......................................   262

»MP3 player« .......................................   266

»Basic settings, transmitter«.............   268

»Servo display« ..................................   274

»Servo test« ........................................   275

»Code lock« ........................................   276

»Info Display« .....................................   278

*  Standard option
 Option can be unlocked at extra cost

Programming examples

Introduction. ...........................................................280

Winged model

First steps .........................................................282

Incorporating an electric drive ..........................288

C1 joystick switchover between:

Electric motor and butterfly ....................291

Electric motor and airbrake ....................293

Timer confirmation with control or switch .........294

Parallel operating servos ..................................296

Using flight phases

Example 1 ...................................................298

Example 2 ...................................................302

Control of temporal processes .........................308

Delta and flying wing ........................................310

F3A model ........................................................314

Helicopter models ..................................................318

Appendix

FCC Information ....................................................329

Declaration of Conformity ......................................330

Warranty Certificate ...............................................331

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 notification. Graup-
ner accepts no responsibility or liability for errors or
inaccuracies which may be contained in
the information section of this manual.

3Table 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 right away at https://www.graupner.de/
en/service/product_registration.aspx since this is
the only way for you to automatically receive current
information about your product via email.

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, i.e. 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 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 finger. 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 -10 °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 Graup-
ner 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 firmly
seated. Do not pull on the cable to disconnect a
plugged connector.

No modifications whatsoever may be made to units.
Modifications will void the operating permit and all
insurance protection. If necessary, send the device
concerned to your local Graupner Service Centre;
see page 331.

Installing the receiver

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. However, do not enclose your receiver
completely, otherwise it may overheat in use.

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 gases 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 antennas are 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 fiber parts, servos, electric
motors, fuel pumps and all sorts 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 a servo
cable be wrapped around the antenna or routed close
to it.

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

Routing the receiver’s antennas

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 fiber material, the
ends of the antennas must extend outside of the hull.

If your model features a carbon fibre fuselage, the
aerial tips must always extend outside the fuselage
for a length of at least 35 mm. If this is not possi-

Safety notices

4

ble, it is essential to substitute longer aerials for the
standard ones (approx. 145 mm long) fitted to HoTT
receiver(s).

The orientation of the aerial(s) is not critical, but it is
advantageous to install one receiver aerial in a verti­cal – upright – position in the model. If your receiver
is a Diversity type – two aerials – the active tip of the
second aerial should be positioned at 90 ° to the tip of
the first aerial, and ideally the distance between the
two tips should be greater than 125 mm.

Servo installation

Always mount servos with the provided rubber vi­bration-damper 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 field 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, be sure the throttle

control is at its Stop/Idle position.

Always switch the transmitter on first

and then the receiver.

Always switch the receiver off first

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 flight 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 91 and 99.

Never operate the transmitter in Model mode, i.e.
for flying or driving, without an antenna. Be sure the
antenna is firmly seated in its socket.

Operating a winged aircraft, helicopter, ship or car

Never fly over spectators or other pilots. Never en­danger humans or animals. Never fly in the vicinity of
high-voltage 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.

Never switch the transmitter off whilst operating
a model! If this should happen accidentally, keep
your nerve and wait until the transmitter screen
is entirely blank, i. e. until the transmitter has
shut down completely; this takes at least three
seconds. Do not switch your transmitter on again
until this has occurred. If you neglect this, there is
a risk that the transmitter will “hang” immediately
after being switched on, and you will lose control
of the model. In this case your only recourse is to
switch the transmitter off again, allow it to shut
down completely, and then switch on once more
after the correct interval.

Aero-towing

When operating a powered tug, ensure that the
receiving systems in the two models are always at
least 50 cm apart. We recommend the use of satellite
receivers in such situations. If you neglect this, there
is a chance of interference from the downlink channel.

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 re-
charged!!” display and acoustic signal.

5Safety notices

Safety notices

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 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 (non-re­chargeable batteries) because they can explode.

All secondary batteries (rechargeable batteries) must
be charged before every session. To avoid short
circuit conditions, first 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 significantly deficient.

Purchase only genuine Graupner batteries!

Interference suppression for electric motors

All conventional electric motors produce sparks be-

Safety notices

6

tween their collector and brushes. Depending on the
type of 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 filters 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 filters, refer to
the Graupner RC main catalog or in Internet at
www.graupner.de.

Servo interference filters for extension cables

Order no. 1040
The servo interference filter is necessary when an

extended-length servo cable is used. This filter is at­tached directly to the receiver output. In critical cases
a second filter 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 influence 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 sufficiently 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 flying right away if a storm is approach­ing. Static charging via the antenna also repre­sents a lethal hazard.

Attention

• In order to fulfill 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 flight, perform a complete functional
test, range test and execute a complete simulated
flight 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.

Liability exclusion / damage compensation

This manual serves only as a source of information
and can be changed without prior notification. Graup-
ner accepts no responsibility or liability for errors or
inaccuracies which may be contained in this manual.

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. Theref ore 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.
Furthermore we will only consider claims if a log file

is present; see page 24 under “Data recording”.
For the same reason the transmitter must always be
updated to the latest software status.

It is essential that you register at https://www.graup­ner.de/en/service/product_registration.aspx to ensure
that you are constantly informed of important soft­ware updates. This is the only means by which we
can automatically keep you aware of new updates by
e-mail.

7Safety notices

Safety notices and handling regulations for Lithium-Ion (LiIo) and Lithium-Polymer (LiPo) batteries

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

These instructions are to be safeguarded. If the unit is
transferred to another user, these instructions should
certainly be passed along to the new user.

General notices

LiIo-/LiPo batteries require particularly attentive han­dling. This applies to charging, discharging as well
as for storage and other handling. Adherence to the
following special specifications is necessary:

• Incorrect handling can lead to explosions, fire,
smoke and poisoning hazards. Furthermore,
disregard for instructions and warnings can lead to
performance losses and other defects.

• The battery’s capacity is reduced by every charge/
discharge cycle. Storing the battery at tempera­tures which are too high or too low can also lead
to a gradual reduction in capacity. In model opera­tion, battery capacity drops to about 50 … 80 %
of new battery capacity after about 50 charge/dis­charge cycles – even though all charge/discharge
rules are followed. This is due in part to the high
discharge currents and inductive currents caused
by motors.

• Battery packs may only be connected in series or
parallel in exceptional cases as cell capacities and
charged state can differ too greatly. This is why the
battery packs we deliver are selected.

Special notices for charging LiIo-/LiPo batteries
from Graupner

• Since Graupner GmbH & Co. KG cannot super­vise the correct charging and discharging of cells,
the entire guarantee is void in cases of improper
charging or discharging.

• Never leave batteries being charged unattended.

Safety notices

8

• Only approved chargers with appropriate charging
cables may be used for charging LiIo-/LiPo bat­teries. Any manipulation to the charger or charger
cables can lead to severe damage.

• The maximum charging capacity must be limited
to 1.05 times the battery’s capacity.

Example: 700 mAh battery = 735 mAh max. charg­ing capacity

• Use only the outlet-charger included with the set
or a specially designed charger/discharger from
Graupner to charge and discharge LiIo-/LiPo bat­teries, refer to page 17 or www.graupner.de.

• Ensure the settings for the number of cells or for
final charging voltage and final discharge volt­age are correct. Be sure to observe the operating
instructions for your charger/discharger.

Other handling notices

• 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 configuration. Batteries may only be
charged under supervision.

• LiIo-/LiPo batteries connected in series within a
pack may only be charged as a group if the volt­age of individual cells do not differ by more than

0.05 V. The LiIo battery included with the set is
equipped with a special safety circuit such that
“compensation” for voltage differences between
individual cells, by way of an otherwise typical
balancer plug connection, is not necessary.

• Under these conditions Graupner LiIo-/LiPo bat­teries can be charged with a maximum of 2 C (the
value 1 C corresponds to the cell capacity) charg­ing current. At a voltage of maximum 4.2 V per cell
and above, charging must continue a constant
voltage of 4.2 V per cell until charging current
drops below 0.1 … 0.2 A.

• Charging voltage over 4.20 V per cell must be
avoided absolutely as the cell would otherwise be
permanently damage and could cause a fire. In or­der to prevent the over-charging of individual cells
in a pack, a cut-off voltage between 4.1 … 4.15 V
per cell should be set to increase service life.

• Never attempt to charge battery cells with the
wrong polarity. Abnormal chemical reactions take
place when batteries are charged with reversed
polarity and the battery will be useless. This can
cause breaks, smoke and flames.

• The permissible temperature range for charging
and storing LiIo-/LiPo batteries is 0 … +50 °C.

Storage

LiIo-/LiPo cells should have a 10 … 20 % charge
capacity when stored. If cell voltage drops below 3 V,
then LiIo-/LiPo cells must absolutely be recharged to
a capacity of 10 … 20 % of full capacity. Otherwise,
further deep-discharging of the battery will make it
useless during storage in a discharged state.

Special notices for discharging LiIo-/LiPo batter­ies from Graupner

• A continuous current rate of about 1 C does not
represent a major problem for Graupner LiIo-/LiPo
batteries. For larger currents, please follow the
catalog specifications. In any case, observe the
maximum current rating for the connector system,
see maximum discharge current on the battery.

• Discharging below 2.5 V per cell damages cells
permanently and is therefore to be avoided abso­lutely.

Short circuit conditions are to be avoided abso­lutely. Permanent short circuits lead to destruc­tion of the battery, high temperatures and perhaps
even self-ignition may follow.

• During discharge, battery temperature must not
rise, in any case, to over +70 °C. Otherwise, better
cooling or a lower rate of discharge must be in-

troduced. The temperature can easily be checked
with the infrared thermometer, order no. 1963. The
battery must never be discharged via the transmit­ter’s charging socket. This socket is not suitable for
this purpose.

Other handling notices

• Never short-circuit the battery. A short-circuit al­lows very high current to flow and this heats up
the cells. This will lead to loss of electrolyte, the
production of gases and perhaps even explosions.
In the vicinity of, or while handling, Graupner LiIo-/
LiPo batteries, avoid electrically conducting sur­faces because of the danger of creating a short­circuit condition.

• Handling connectors

These connectors are not as robust as for other
batteries. This applies particularly to the plus pole
connector. The connections can easily be broken
off. Due to thermal transfer, the connector tabs
may not be soldered directly.

• Cell connection

Direct soldering on battery cells is not permitted.
The heat of direct soldering can damage battery

components, such as separator or isolator.
Battery connections should only be made by in-

dustrial spot welding. A professional repair made
by the manufacturer or distributor is necessary to
replace missing or torn-off cables.

• Replacing individual battery cells

The replacement of battery cells may only be
made by the manufacturer or distributor and never
by the user himself.

• Damaged cell usage

Damaged cells may never be used or returned to
service.

Characteristics of damaged cells include: dam­aged housing packing, deformed battery cells,
electrolyte or leaking electrolyte. In these cases,

further use of the battery is not permissible.
Damaged or useless cells are hazardous waste

items and must be appropriately disposed.

General warning notices

• Batteries must never be put in fire or burned.

• Battery cells must not be submerged in liquids,
such as water, seawater or beverages. Any contact
with liquids, of whatever nature, is to be avoided.

• 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 must not get into the vicinity of babies or
small children. If a battery is swallowed, immedi­ately go to a doctor or emergency medical facility.

• Batteries must not be put in a microwave oven or
put under pressure. Smoke, fire and more can be
the consequences.

• Never dismantle a LiIo-/LiPo battery. Dismantling
a battery can cause internal short-circuits. Gas,
fire, explosions and other problems can result.

• The electrolyte and electrolytic vapors in LiIo-/LiPo
batteries are harmful. Absolutely avoid all direct
contact with electrolytes. If electrolytes come into
contact with skin, eyes or other body parts, im­mediately wash out or rinse out with generous
amounts of fresh water then be sure to consult
a doctor.

• Batteries built into equipment must always be
removed from that equipment when it is not cur­rently in use. Always switch off equipment after it is
used to prevent deep discharging. Always charge
batteries before it is too late. Store batteries on a
non-combustible, heat resistant, non-conducting
surface! Deep-discharged LiIo-/LiPo batteries are
defective and may no longer be used!

Notice for remote control set mc-16 HoTT and

mc- 2 0 HoTT

Order no. 33016 / 33020
These radio control sets are fitted as standard with a

LiIo transmitter battery with integral protective circuit
(changes reserved). Once the factory preset voltage
limit of 3.60 V has been reached, a warning will ap­pear in the display.

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 environ-

mental protection.

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

9Safety notices

mc-16 and mc-20

The Newest Generation of Remote Control Technology

The technical advances across the entire spectrum of
model building is an ever-present challenge to design
engineers. This is why the introduction of new trans­mission technology in the 2.4 GHz band represents a
new milestone.

The HoTT-System (Hopping Telemetry Transmission)
developed by Graupner is a synthesis of know-how,
engineering and testing done around the world by
professional pilots.

Established Graupner HoTT techniques theoretically
permit over 200 models to be operated at the same
time. However, because of the interspersed radio­frequency utilization permitted by certification for the

2.4 GHz ISM band, this number is significantly 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 difficult in broken
landscapes, such as on hillside slopes) represents an
enormous boost for remote control operating security.

Bidirectional communication between transmitter
and receiver, by way of a return channel built into
the receiver, permits convenient access to data and
programming in the HoTT receiver. For example, this
makes it possible to s wap receiver outputs or to divide
up control functions among multiple servos (channel
mapping). Servo travel and servo rotation directions
in the receiver can also be matched to one another
with these facilities. Telemetry data, like VARIO and
GPS data, can be called up from optionally available
modules.

mc-16 HoTT and m c- 20 HoTT radio control

The
sets are based on the Graupner/JR mc-24 computer
radio control system, which was introduced back in

1997. The new equipment has been specially devel­oped for the advanced RC pilot. The transmitters of
this series offer an unprecedented level of security
and reliability combined with outstanding operating
convenience and ease of use.

Both these HoTT systems can easily be used to oper­ate all current model types, whether your preference
is for fixed-wing model aircraft or helicopters, model
cars or boats.

For example, every
HoTT transmitter is fully equipped in terms of soft­ware and hardware to allow the use of the renowned
NAUTIC modules. A further innovation is the “channel
sequencer” – available as standard only on the mc-

mc-16 HoTT and m c- 20

20 HoTT – which provides a means of automating

servo sequences involving up to three servos.
However, it is fixed-wing model aircraft and helicop-

ters in particular which call for complex mixed func­tions involving the control surfaces or swashplate
control system. In this respect the latest computer
technology makes it extremely simple to program the
system to cope with a vast range of model require­ments: simply select the appropriate model type in
the program of your HoTT transmitter, and the soft­ware automatically sets up all the relevant mixing
and coupling functions. Separate modules for imple­menting complex coupling functions are no longer
required, and complicated mechanical mixers in the
model are completely superfluous.

Additional flight-phase-specific 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 flight maneuvers
at the “press of a button”. Additional model memo­ries can be stored on the SD card, which is included
standard with the set. Even telemetry data can be
recorded for subsequent evaluation on a PC.

Since the
plays, the lower display has been optimized for com-

mc- 2 0 HoTT is equipped with two dis-

prehensible, simple operation of the software. The
graphic representation of mixer functions is particu­larly helpful. The upper display allows telemetry data
to be called up from the receiver.

Functionally-related options are clearly arranged by
content in a simple organization. The clear, compre­hensible program structure permits a beginner to
quickly become familiar with the various functions and
able to use all options pertinent to his level of exper­tise with remote control models.

This handbook describes every menu in detail. There
are tips, many notices and programming examples to
supplement the descriptions and also explanations for
model specific technical terms, like transmitter con­trol, dual rate, butterfly, and so on.

Please observe the safety notices and technical
notices. Read through the instructions attentively.
Before usage, test all functions by simply attaching
servos to the receiver included in the set. While doing
this, observe respective notes on page 77. This will
help you learn the essential operating techniques and
functions of your HoTT transmitter.

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 pleasure and
success with your HoTT transmitter system, the new­est generation of remote control systems.

Kirchheim-Teck, November 2012

10

Foreword

mc-16 and mc-2 0 series computer systems

two remote control sets with 2,4-GHz-Graupner|SJ-HoTT technology
(Hopping Telemetry Transmission)

• Integrated Graupner|SJ HoTT 2.4 GHz transmis­sion system

• The high-speed primary processor is used for data
transfer, ensuring ultra-fast response times.

• Maximum interference immunity made possible by
optimized frequency hopping through as many as
75 channels and wider channel spread

• Intelligent data transfer with correction function

• Over 200 systems can be used simultaneously

• The HoTT technique of bidirectional communica­tion between sender and receiver, as well as the
fastest possible transmission rate (10 ms) assures
extremely short reaction times.

• Modulation can be switched by software: when
necessary, you can switch from “HoTT” to “EXT.” or
“SP.” by pressing a button.

• Case incorporates integral patch aerial

• Transmitter features integral slot for SD and SDHC
memory cards, formatted to FAT or FAT32, for
saving log files, model programming data and sup­plementary functions such as transmitter firmware
updates.

• Transmitter features alternative method of battery
charging via the USB socket.

• 6 different languages (Dutch, English, French,
German, Italian and Spanish) available per soft­ware update. For the availability of a given lan­guage, refer to the download area.

• Simplified arrangement of operating elements,
such as joysticks, external switches, proportional
controls and trim levers as control functions

• CONVENIENCE MODE SELECTOR to simplify
changeovers between operating modes 1 … 4
(e. g. throttle left/throttle right)

• Extremely wide receiver operating voltage range
of 3.6 V to 8.4 V (functional to 2.5 V)

• Fail-safe, free channel assignment (channel map­ping), mixer functions and all servo settings are

Technology that enthralls.
The superior functional security of Graupner/SJ

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.

Simplified programming using capacitive touch­buttons on the
buttons on the mc-16 HoTT.

mc- 2 0 HoTT and four-way push-

The illustration shows the contents of the mc- 20 HoTT transmitter set.

High-contrast eight-line graphic screen provides
a clear display of all set-up parameters. Switcha­ble blue backlighting. The
an independent second screen for displaying te­lemetry data. Storage of telemetry data on a micro
SD memory card.

USB connection to read and write the model’s
memories as well as for making firmware updates.

mc- 2 0 HoTT features

11Remote control set description

mc-16 and mc-2 0 series computer systems

two remote control sets with 2,4-GHz-Graupner|SJ-HoTT technology
(Hopping Telemetry Transmission)

simple to program

• Swashplate limiting: This function limits the
swashplate’s tilt angle to prevent the potential for
mechanical collision in helicopter 3D operation at
full-limit roll and pitch-axis

• Multi-channel function for operating Graupner
product line NAUTIC modules

• Digital trimming, effective per specific flight-phase

• C1 changeover, brake/elec. motor: This changeo­ver can be implemented very easily via enhanced
flight phase programming. The pilot determines
the joystick positions (forward/rear) at which the
motor is to switched off or the airbrakes are to be
retracted.

• Twelf freely programmable mixers for fixed-wing
or helicopter models, each with freely selectable
input and output functions; four curve mixers with
innovative 6-point curve technology for easy to
set and adjust curve values at up to eight points
for throttle, pitch, tail or other nonlinear character­istics. The arithmetic unit in the CPU employs an
ingenious method of calculating polynomial ap­proximations for truly-rounded, ideal MPC (multi­point curve) mixer curves.

• Curve mixer points can be offset in both axes us­ing the four-way buttons.

• Up to seven flight-phase programs can be indivi­dually adapted for each model and given a name.
The switchover time is programmable separately.

• SUPER SERVO menu with a perfect overview of
all servo setting data and simple parameter cor­rection at four “levels”: direction of rotation, mid­point setting, separate servo travel on both sides
and separate travel limiting on both sides for 8

mc-16 HoTT) respectively 12 servos (mc-20

(
HoTT) with a total of 48 respectively 72 setting
options.

• SUPER-DUAL-RATE, EXPO and EXPO/DUAL-

Remote control set description

12

RATE menu with 36 potential setting variants
for three servo functions and up to seven flight
phases

• Servo display hot-key: from virtually any menu,
pressing the  and  buttons of the left-hand
four-way button takes you directly to the servo
display

• Highly practical multi-function menus for fixed-wing
model aircraft and helicopters. Entering the num­ber of aileron and flap servos, or collective pitch
servos, automatically sets up all the relevant mixer
functions in the appropriate multi-function menu.

• Helicopter swashplate mixer for 1, 2, 3, or 4 point
steering.

• Future-proof design: updatable, high-speed 32­bit operating system with modern flash memory,
simple update capability via the USB port and the
micro-SD card.

• Transmitters feature sockets for PC USB interface,
earphone, SMART-BOX, DSC system as standard;
they are prepared for Trainer mode operations

• ESC button switches the screen from the Main
menu to the »Telemetry« menu and back.

• Comprehensive telemetry displays, programming
and analysis functions directly on the transmitter
screen

• Wired and wireless Trainer systems with total
transfer; all settings are entered at the Teacher
transmitter.

mc-16 HoTT

• 20 model memories with storage of all model-spe­cific programming and set-up parameters

• Eight control functions as standard, can be ex­panded to twelve at extra cost

• MULTI-DATA GRAPHIC LCD monitor with blue
backlighting for greatly improved legibility in dif­ficult lighting conditions.

• Function encoder with two four-way push-buttons

for simplified programming and accurate settings

• Key-Lock function guards against accidental op­eration

• Transmitter features two 3-position switches (SW
5/6 + SW 11/12), two side-mounted proportional
controls (Lv1 + 2) and two proportional sliders
(Sl1 + 2) as standard; controls can be assigned to
any function

• Certain menu points can be unlocked as an extra­cost option; see Contents on pages 2 and 3 and
the start of the relevant menu points

*  Standard option

 Option can be unlocked at extra cost

mc- 2 0 HoTT

• 24 model memories with storage of all model-spe­cific programming and set-up parameters

• Maximum twelve control functions

• Two MULTI-DATA GRAPHIC LCD monitors with
blue backlighting for improved legibility in difficult
lighting conditions

• A function encoder with two touch-sensitive, four­way keys („CAP Touch“) permit simplified pro­gramming and precise settings

• Twelve toggle switches (three 3-position switches
(SW 2/3, 5/6 + 11/12), five 2-position switches
(SW 4, 7, 9, 13 + 15), two centre-biased 2-posi­tion switches (SW 8 + 14), two 2-position locking
switches (SW 1 + 10), two momentary switches
on the rear of the transmitter (SW 16 + 17 / 18 +

19), two INC/DEC buttons (CTL 5 + 6), two side­mounted proportional controls (Lv1 + 2) and two
proportional sliders (Sl1 + 2) installed as standard;
controls can be assigned to any function

• Key-Lock function guards against accidental ope­ration

• Voice and, as applicable also MP3 file, output over
headset output or loudspeaker

• Ring-limiter: functions similar to swashplate limi­tation but is used for control of up to three Voith­Schneider drives in ship models.

• Channel sequencer for automating servo motion
sequences of up to three servos, e. g. to automate
the lowering of landing gear or to extend/retract
drives in self-launching gliders.

Model programs

• Model type icon: graphic model type indicator
(fixed-wing / helicopter)

• Transmitter operating hours timer

• Flight phase switch assignments: six switches, two
with a priority function. Every switch combination
can be named freely. This makes the number of
flight phases independent of the number of flight
phase switches.

• Tail type normal, V-tail, Delta/flying-wing and 2 HR
Sv 3+8 (which immediately makes two coupled
elevator servos available without using free mixers
or dual mixers)

• Flap count 4 AIL/4 FL: Full support of eight wing
servos, even without use of free mixers (standard
feature only on the twelve-channel
transmitter; can be unlocked at extra cost on the

mc- 2 0 HoTT

mc-16 HoTT)

• Expanded transmitter control menu: single-sided
centre offset facility. With the exception of the
trims, all transmitter control elements can be as­signed as transmitter controls. Option of assigning
two switches to each input to act as a genuine
three-stage function.

• Wing mixers: New concept for the multi-flap menu
to simplify settings of one to eight wing servos on
a flight-phase specific basis in a comprehensible
manner without requiring the use of free mixers

• »Logical switches«: this function permits two
switches to be coupled as »and« or »or« logic
functions. The result can be employed as a virtual

switch. Typical application: The activation of certain
functions should only be possible in conjunction
with other functions, e. g. wheel brake can only be
activated when the landing gear is down. A num­ber of functions which are normally independent
of one another, are to be put in their base settings
by way of an »Emergency switch«. This program
automation can be activated by multiple switches
that also select the appropriate program. (Stand­ard only on the

mc- 2 0 HoTT, optional on the

mc-16 HoTT.)

• Flight phase switching cutoff delay: the delay time
can be switched off for individual channels on a
flight-phase basis (e. g. for motor off in electric
models or to activate/deactivate helicopter head
lock). (Standard only on the
tional on the mc-16 HoTT.)

• Expanded servo centre adjustment range: now
+/-125 %

• Number of flight phases: fixed-wing: 7, helicopter:
6 + AR

• Phase trim available on all axes of fixed-wing mo­dels

• Servo assignments can be swapped at the re­ceiver output

• Additional functions planned; implementation via
software update.

General HoTT features

• Simple, extremely fast binding for each model

• Ultra-fast re-binding even at maximum range

• Any number of receivers can be bound to provide
additional channels (max. 32 channels)

• Range: test and warning function

• Low-voltage warning

• GR-16 and GR-24 receivers used in SAME mode
can simultaneously address a maximum of four
servos as a block, with a frame rate of 10 ms (digi­tal servos only!)

mc- 2 0 HoTT, op-

• Thanks to cycle time reduced down to as little
as 10 ms, extremely short response times are
achieved.

• Real-time telemetry analysis on the transmitter
screen. As an option, telemetry data can also be
displayed on the SMART-BOX.

• Selectable cycle time: 10 ms or 20 ms/30 ms, de­pending on receiver and operating mode

• Channel mapping in the receiver allows free distri­bution of control functions.

The travel distance and rotation direction settings
integrated into the receiver make it possible, for
example, to match up mapped servos with one an­other.

• The programmable fail-safe functions »Hold«,
»Off« and »Move to preset positions« that are built
into the receiver for every individual servo channel
can be set separately.

13Remote control set description

mc-16 and mc-2 0 series computer systems

two remote control sets with 2,4-GHz-Graupner|SJ-HoTT technology
(Hopping Telemetry Transmission)

The Order No. 33016 set includes

• Microcomputer transmitter
with built-in LiIo transmitter battery
1s4p/4000 mAh/3.7 V and two 3-position switches,
two proportional sliders on the centre console
and two side-mounted proportional rotary controls
(change reserved)

• plug-in charger (4.2 V, 500 mA)

• Short and long stick-tops
(Order No. 33000.2 and 33000.3)

• bidirectional receiver Graupner|SJ GR-16 HoTT
(order no. 33508) for connection of up to 8 servos

• USB adapter/interface (order no. 7186.6) including
suitable USB cable for connection to a PC and an
adapter cable for receiver updates

• Micro-SD card (4 GB) with an adapter for a card
reader

Replacement parts

Order No. Description
3080 Aluminum transmitter case, HoTT,

400 x 300 x 150 mm

33000.1 Transmitter battery, flat LiIo, single cell six-

pack/6000 mAh 3.7 V TX

33002.1

33012.2 Transmitter metal hanger for

Micro-SD card, 4 GB for HoTT transmitter

mc-16 HoTT

mc-16 and

mc- 2 0 HoTT

33012.3 Hand rests for the transmitters

and mc- 2 0 HoTT (2 piece)

Remote control set description

14

mc-16

The Order No. 33020 set includes

• Microcomputer transmitter
HoTT with built-in LiIo transmitter battery
1s6p/6000 mAh/3.7 V and twelve toggle switches
(three 3-position switches, five 2-position switches,
two centre-biased 2-position switches and two
2-position locking switches), two momentary
switches on the back of the transmitter, two INC/
DEC buttons (CTL 5 + 6) plus two side-mounted
proportional rotary controls and two proportional
sliders (specification reserved)

• plug-in charger (4.2 V, 500 mA)

• Short and long stick-tops
(Order No. 33000.2 and 33000.3)

• bidirectional receiver Graupner|SJ GR-24 HoTT
(order no. 33512) for connection of up to 12 servos

• USB adapter/interface (order no. 7186.6) including
suitable USB cable for connection to a PC and an
adapter cable for receiver updates

• Micro-SD card (4 GB) with an adapter for a card
reader

• Metal hanger for transmitter straps

• Transmitter strap

• Hand rests

• Aluminum transmitter case

mc- 2 0

Accessories

Order No. Description

71.26 Transmitter straps, Graupner|SJ HoTT

72.40 Transmitter straps, deluxe

Teacher/pupil cable for the transmitters

Other accessories in Internet at www.graupner.de.
Contact or visit your local dealer. He will be glad to
provide advice.

mc-16 HoTT and m c- 20 HoTT, see

page 225

Technical data

mc-16 HoTT and m c- 20 HoTT transmitter

Frequency band 2.4 … 2.4835 GHz
Modulation FHSS
Region EURO or FRANCE,

see page 272

Control functions

mc-16 HoTT:

8 functions, 4 of these can be
trimmed, can be expanded to
12 functions at extra cost

mc- 2 0 HoTT:

12 functions, 4 of these can

be trimmed
Temperature range -10 … +55 °C
Antenna Integral patch aerial inside

case
Operating voltage 3.2 … 4.8 V
Current draw about 400 mA
Range up to about 4 000 m
Dimensions about 235 x 228 x 66 mm

(without hand rests)
Weight about 1200 g with transmitter

battery, without accessorys

GR-16 HoTT receiver

order no. 33508
Operating voltage 3.6 … 8.4 V*
Current draw about 70 mA
Frequency band 2.4 … 2.4835 GHz
Modulation FHSS
Antenna 2 diversity antennas, about

145 mm long, about 115 mm
of this length encapsulated

and about 30 mm active
Plug-in servos 8
Sensor sockets 1
Temperature range -10 … +55 °C
Dimensions about 46 x 21 x 14 mm
Weight about 12 g

GR-24 HoTT receiver

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 2 diversity antennas, about

145 mm long, about 115 mm
of this length encapsulated

and about 30 mm active
Plug-in servos 12
Sensor sockets 1
Temperature range -10 … +55 °C
Dimensions about 46 x 31 x 14 mm
Weight about 16 g

* The specification 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

15Remote control set description

General operating notices

mc-16 HoTT and mc-2 0 HoTT transmitters

Transmitter power supply

mc-16 HoTT and m c- 20 HoTT transmitters are

fitted as standard with rechargeable Lithium-Ion bat­teries differing in capacity. (Change 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 272,),
default value 3,60 V, an audible warning signal will
sound and the message window shown below will ap­pear in the screen

Stp

#01

3.5V

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 272! “Lith” must be

set as standard.

The transmitter’s rechargeable LiIo battery can be
charged by way of the charger socket located behind
a cover on the left, front side of the transmitter – as
viewed from the front – with the included plug-in
charger (order no. 32032.4), see page 22.

Batt. must
be re­ charged!!

x

0 00

0

T

0V

Charging the transmitter battery using the plug­type charger

With the plug-type charger
(4.2 V / 500 mA) included
in the set the charge time
for the transmitter bat­tery is up to about fifteen
hours, depending on
the pack’s initial state of
charge.

Never use any other type or make of plug-type charg­er, nor a charger designed for other types of battery.
There is a risk of excessive output voltage and incor­rect connector polarity (see below), either of which
can result in very serious damage. We recommend
that you label the standard charger to avoid confu­sion. Please read the Safety Notes on pages 8 …

9.
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.

Charging the transmitter battery via the USB socket

The transmitter is supplied fitted with a genuine
Graupner/SJ transmitter battery with integral pro­tective circuit, Order No. 33000.1, which can also
be charged via the USB port of the
and mc- 2 0 HoTT transmitter at the usual current
available at USB ports; see “mini-USB socket” on
page 25.

C A U T I O N: charging a battery without integral
protective circuit via the USB socket incurs a serious
risk of fire!

mc-16 HoTT

Charging with automatic chargers

To achieve quicker recharging of the single cell LiIo
battery, Graupner automatic chargers can also be
used. The table below shows a selection of these
chargers.

Recommended chargers (accessory)

suitable for

battery types

Order
No. Designation

6411
6463
6464
6466
6468
6469
6470
6475
6478
6480

Charger cable, order no. 3022 is additionally needed for the trans­mitter and charger cable, order no. 3021 is additionally needed for
the receiver.

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.

The charger socket is equipped standard with a diode
to protect against reversed polarity. Original Graupner
automatic chargers also detect battery voltage polar­ity.

Observe the configuration notices for the charger
used.

Ultramat 8 x x x x x
Ultramat 12 plus x x x x x x
Ultramat 14 plus x x x x x x x
Ultra Trio plus 14 x x x x x x x
Ultramat 16S x x x x x x x
Ultra Trio Plus 16 x x x x x x
Ultramat 18 x x x x x x x
Ultra Duo Plus 45 x x x x x x x
Ultra Duo Plus 60 x x x x x x x

Ultra Duo Plus 80 x x x x x x x

Input voltage 220 V

Input voltage 12 V

NiCd

NiMH

LiPo/LiIo

lead battery

integr. balancer

General operating notices

16

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.

Charging current may not exceed 1.5 A as other­wise the diode, and perhaps other components,
could be damaged. If necessary, limit the current
at the charger.

mc- 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.

Removing the transmitter’s battery

To remove the transmitter battery locate the cover of
the battery compartment in the back of the transmitter
and slide it off in the direction of the arrow:

Battery connector

nect the transmitter battery’s connector by carefully
pulling on the supply line cable.

(The photo shows the battery of the
transmitter.)

Inserting the transmitter’s battery

The battery connector is protected against a reverse
polarity connection by two slanted edges, see illustra­tion. When correctly plugged in, the
unconnected pin of the connector
is at the bottom, as shown in the
illustration. The plus pole (red lead)
is in the middle and the minus pole
(brown or black lead) is toward the
antenna side.

Never try to force the connector onto its circuit-board
socket.

Place the battery into its compartment and close the
transmitter’s cover.

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
significantly higher than when the transmitter was last
used, e. g. because the battery was charged.

Stp

#01

4.1V

0:00h

Flt

mc- 2 0 HoTT

Transmitter
connector polarity

0:00
0:00

HoTT

Mx

0.0V

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 charg-

ing current specified 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 charg-

ing, perform several test charging procedures to
ensure the flawless functionality of its automatic
shut-off. This applies particularly if you want to
charge the standard installed Lithium battery with
an automatic charger unit. You may need to alter
the charger’s cut-off behaviour if the charger you
are using offers this option.

• Do not execute a battery discharge or battery

maintenance program through the charger jack.
The charger jack is not suitable for this purpose.

• Always connect the charger cable to the charger

first 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 significantly, check the bat-

tery’s condition, replace the battery or reduce the
charging current.

• Never leave a charging battery unattended.

• Follow the safety notices and handling instruc-

tions provided on page 8.

Lift one side of the battery and withdraw it from the
hook-and-loop tape without using force. Then discon-

17General operating notices

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.
Open the battery compartment as described on

the previous double-page. If the handrests are fit­ted, undo the three lower retaining screws of the six
screws in each handrest.

Now undo the five recessed screws in the back of
the transmitter and the battery well using a PH1-size
cross-point screwdriver; see illustration:

side.

Important notices:

• Ensure that the shorter screw – in the battery
well – does not fall inside the transmitter.

• Make no modifications of any kind to the cir­cuitry as this will void the guarantee as well as
the unit‘s official permit.

This applies in particular to the switches in­stalled on both sides of the front screen. If you
wish to change the arrangement, contact your
nearest Graupner Service Centre.

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

• 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.

• … fit the shorter of the five screws in the battery
compartment again.

• … reconnect the battery.

• … re-install the handrests if you wish.

Lithium battery CR 2032

When you remove the transmitter back panel, you will
see the holder for a CR 2032 battery on the circuit
board below the aerial base, slightly left of centre:

Lithium battery

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.

Note that the screw-holes are inclined slightly to the
rear, so the cross-point screwdriver should be applied
at the corresponding angle.

Hold the two housing sections together by hand then
turn the transmitter upright over a suitable surface so
these 5 screws can fall out without getting lost. Now
lift up on the backplate carefully and place it to one

General operating notices

18

Stick conversions
Neutralization

Both the left and the right joystick can be configured
for neutralized or non-neutralized operation. Open the
transmitter.

To change the joystick’s factory setting, locate the
screw shown in the figure below enclosed in a white
circle.

Note:
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.

Brake spring and ratchet

The outboard screw of the two marked in the next
figure adjusts the braking force and the inboard screw
adjusts the strength of the ratchet for the respective
joystick:

Note:
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 figure be­low.

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

• clockwise = stronger return,

• counter-clockwise = weaker return.

vertical

horizontal

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.

Note:
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.

19General operating notices

Stick 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.

The procedure is the same if you wish to replace the
short stick-tops with the longer ones also supplied in
the set.

Transmitter neckstrap support bars

As standard the

mc- 2 0 HoTT transmitter set in-

cludes a strong support system for the attachment of
a neckstrap. The mc-16 HoTT transmitter can be
retro-fitted with the transmitter support system, Order
No. 33012.2, at any time.

The support bars are inserted in the sockets in the
transmitter case, and locked in place. After the trans­mitter has been used, they can be removed again in
similar fashion:

first press,
then turn

The support bars are installed as follows: push one
of the bars into the socket in the transmitter case,
angled towards the centre of the transmitter as shown
above. Now ensure that the retaining pin attached to
the bar is in line with the slot in the socket, and press
the bar against the spring in the direction of the trans­mitter for a distance of about one centimetre. At the
same time fold the bar outwards (do not use force) in
order to lock it in place. Install the second support bar
in the same manner.

To remove the support bars first unlock one of the
bars by lightly pressing it inwards, and then fold it
towards the centre of the transmitter. As soon as the
retaining pin is free, you can withdraw the support bar
from its guide. Repeat the procedure with the second
support bar.

The following straps are available as accessories:

Order no. Description

71.26 Transmitter straps, Graupner/SJ HoTT

72.40 Transmitter straps, deluxe

General operating notices

20

Transmitter description

Front side

(The illustration shows the mc- 20 HoTT transmitter.)

Integral aerial inside case

Connector sockets

on the face side, protected by a cover, see beginning
page 22

LC Display (more details available on page 28.)

ON/OFF switch (ON/OFF with LED display)

Hold the ON/OFF switch pressed in for about one
second to switch the transmitter on. Hold it pressed in
for about three seconds to switch off.

Option wells for switches and buttons:
The following are fitted as standard:

mc-16 HoTT: 2 three-position switches
mc- 2 0 HoTT: 12 switches of various type and 2

INC/DEC buttons

Function module

rotary control: left side “Lv1”,
right side “Lv2”

Function module

two sliders “Sl1” and “Sl2”

Digital trim

For the fine-tuning of servo positions (travel
neutralization). Each click produces an incre­ment of adjustment (position indicator in
display). The trim increment can be selected
in the »Stick settings« menu.

left four-way button:

ESC = select/confirm
ESC touched for about 1 s: Changeover between

telemetry menu and basic display

= scroll in one of the four directions with every

tap (, , , )
simultaneous horizontal tap ()
= changeover between basic display and servo

display

simultaneous vertical tap of the left

+

() keys + "SET" of the right four­way button = changeover to the "secret
options", see page 34.

Loud
speaker

mc-2 0

LC Display (more details available on page 28.)
Contrast adjustment in the »General settings«
menu; see page 271.

Warning indicators:

• for underrun of preset battery voltage threshold

• for fault function of the teacher/pupil system

• C1 joystick too far toward full throttle when trans­mitter is switched on

• …

LED indicators

BATTERY: illuminates when voltage is sufficient
RF: illuminates during RF radiation
WARNING: blinks, for example, when "Throttle too

high", "no pupil signal", "Transmitter
battery voltage too low", …

Joystick

Two joysticks for a total of four independent
control functions. The length of the joysticks
can be adjusted. The correlation of control
functions 1 … 4 can be set on a model
type basis by way of the »Basic settings,
model« menu, e. g. throttle left or right. The
throttle joystick can be converted from neu­tralizing to non-neutralizing, see page 19.

touch sensitive keys, left and right

right four-way button:

SET = select/confirm

= scroll or change value with every touch of one

of the four direction
symbols (, , , )

Circle with the finger around the circumference
= scroll/change values. Alternative values selec-

tion with the left four-way button (, , , )

or

simultaneous tap on 
or  = CLEAR

Transmitter description - Front side

21

Face-side connections

Charger socket

(The illustration shows the mc- 20 HoTT transmitter.)
The left-hand side flap provides access to the charge

socket of the
transmitter:

The transmitter’s rechargeable LiIo battery can be
charged by way of the charger socket located behind
a cover on the left, front side of the transmitter – as
viewed from the front – with the included plug-in
charger (order no. 32032.4).

Maximum permissible charging current with Graupner
automatic chargers: 1,5 A.

Never use plug-in chargers from other manufacturers
or chargers intended for other battery types. Charger
output voltage which is too high or possibly even
different plug polarity, see further below, can cause
immense damage.

More information about charging the transmitter’s
battery can be found on page 16. Observe the
safety notices beginning on page 8 when handling
lithium batteries.

Transmitter description - Face-side connections

22

mc-16 HoTT and m c- 20 HoTT

DSC jack

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.

Once the left-hand side flap has been moved away,
the DSC socket is accessible:

The two-pole DSC socket fitted as standard to mc-

16 HoTT and mc-2 0 HoTT transmitters serves

both as Trainer socket (Teacher and Pupil) and also
as interface for flight simulators and external RF
modules.

To ensure a proper DSC connection, please ob­serve:

1. Make any necessary menu changes.
Refer to the section beginning on page 222 to

adapt the transmitter to a teacher/pupil system.

2. When operating a flight simulator or when operat­ing the transmitter as a pupil transmitter, ALWAYS
switch OFF the transmitter 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.

Only the red “
constantly illuminated and the transmitter’s ba-

Battery

” LED should remain

sic display should show the character string “DSC”
below the operating time clock. At this time, the
display of telemetry data and symbols will be sup­pressed.

ELEVE

#11

4.1V

0:01h

The transmitter’s upper display will show the mes­sage “CANNOT RECEIVE DATA” during this time.

Thus the transmitter is ready for operation.
In contrast, the transmitter in teacher mode is to

be switched on prior to plugging in the respec­tive cable.

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

Important:
Pay attention that all plugs are inserted se-

curely into their respective sockets and use
only the prescribed 2-pole TRS connector
plugs on the DSC-side.

4. In the line „DSC Output“ in the »Basic settings,
model«, page 92 or 100, – depending on the

number of functions transferred – one of the follow­ing modes can be set: PPM10, PPM16, PPM18 or
PPM24. Default setting: PPM10.

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

Stp
Flt
DSC

0:00
0:00

HoTT

Data jack

Headset connector

The left-hand side flap provides access to the DATA
socket of the
transmitter:

This jack is intended for connection of the optional
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.

However, the Data socket can also be used to con­nect external RF modules made by other manufactur­ers; see “EXT.” and “SP.” in the “Module” section of
the “Basic model settings” menu on pages 88 and

96.

mc-16 HoTT and m c- 20 HoTT

Once the right face-side cover has been moved away,
the transmitter’s headset connector is accessible:

The jack is intended for connecting conventional ear­plugs or a headset by way of a 3.5 mm TRS plug. (not
included in the set) An appropriate symbol will appear
in the basic display when a headset is connected:

Stp

#01

3.9V

2:22h

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 about
this can be found under “Voice output” in the sec­tion »SECRET MODE« beginning on page 34 and
»Telemetry« beginning on page 240.

The volume of signals and voice output sent to the
headset can be adjusted individually in the lines
“Voice volume”, “Vario volume”, and “Beeps volume”
of the »General basic settings« menu, page 268.

Flt

M

0:00
0:00

HoTT

5.5V

23Transmitter description - Face-side connections

Card slot

micro SD and micro SDHC
The transmitter’s card slot for type micro-SD and

micro-SDHC memory cards becomes accessible
once the right face-side cover has been turned away.

Although a memory card is supplied as standard, the
slot also accepts any standard commercial micro-SD
memory cards of up to 2 GB capacity and micro­SDHC cards of up to 32 GB capacity. 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 to be used in the transmitter
is that known in conjunction with digital cameras and
cell phones. It is to be pushed into the slot, contacts
up, until it latches, see photos above. Once the mem­ory card has been inserted, the transmitter’s cover
flap can be closed again.

If the standard memory card is inserted – or another
card which has already been inserted in the transmit­ter at least once – then the card is immediately ready
for use when the transmitter is switched on. When the
transmitter is switched on again after inserting such
a card, the stylised memory card icon appears in the
base display:

Transmitter description - Face-side connections

24

Stp

#01

3.9V

2:22h

If the card has not previously been inserted, the
transmitter first creates a number of folders on it;
this is indicated in the transmitter’s base display by
a card symbol which slowly fills from left to right. The
memory card is ready for use as soon as this anima­tion ceases.

You can remove the prepared memory card from the
transmitter when required, and insert it in a suitable
card reader. Connect the reader to your PC or laptop,
and copy the files – previously downloaded from the
Download page for your transmitter – into the appro­priate folder. Now remove the memory card from your
card reader and insert it in the transmitter once more.

Removing the memory card

Press the SD or SDHC card a bit further into the
card slot to release the slot’s latch then pull out the
memory card.

Data acquisition / storage

The storage of data on the SD card is coupled to the
flight 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 – data acquisition is
also started. Data acquisition will stop again when the
flight timer is stopped. The flight timer is started and
stopped as described in the section »Timers (gen-
eral)” on page 162.

The amount of data written on the memory card is
presented as a black bar graph (
from left to right as data fills the memory card .

After a data acquisition session is finished, there will
be an (empty) folder “Models” and a “LogData” folder

Flt

M

0:00
0:00

HoTT

5.5V

) which grows

on the memory card. Within the “LogData” folder there
will be log files, that are designated with names in the
format 0001_year-month-day.bin, 0002_year-month­day.bin, etc., in sub-folders named “model name”. If
a model memory is still “unnamed” the respective log
files can be found in a sub-folder designated “No­Name” when the memory card is removed from the
transmitter and inserted into the card slot of a PC or
laptop. 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 files

As mentioned in section “Headsets”, here at the right,
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 can be replaced by a
voice packet of a different language at any time. More
information about this can be found in the section
»SECRET MODE« beginning on page 34.

Transmitter firmware updates

The transmitter firmware can be updated and – if
necessary – replaced at this menu point, using the
procedure described in the previous section entitled
“Importing voice files”; the screen language can also
be changed here. For more details of this please refer
to the section entitled “SECRET MODE” which starts
on page 34.

Updates and more information can be found on the
product page for your specific HoTT transmitter; see
the Download section at www.graupner.de.

Important notes:

• No claim can be considered unless a log file is
present; see left under “Data recording / stor-

Mini-USB connector

ing”.

• For the same reason the transmitter must al­ways be updated to the latest software status.

• It is essential that you register at https://www.
graupner.de/en/service/product_registration.
aspx to ensure that you are constantly in­formed of important software updates. This is
the only means by which we can automatically
keep you aware of new updates by e-mail.

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 »Copy / Erase« beginning on
page 80.

Notes:

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

• In principle the model memories of the mx-20 and

mc- 2 0 transmitters are compatible, BUT:

If you wish to carry out an “Import from SD card” in
the other transmitter you must first copy or move
the appropriate model memory to the appropriate
folder on a PC. For example: from \\Models\mc-20
to \\Models\mx-20, or vice versa.

See page 82 for more information on “Import
from SD card”.

C A U T I O N :

After you have carried out an “Import from SD
card” it is absolutely essential to check all the
model functions with great care. Note also that the
transmitter control and switch functions may need
to be adjusted to suit the new transmitter.

The right-hand side flap of mc-16 HoTT and mc-

20 HoTT transmitters provides access to the soft-

ware update socket, which is also used for altering
the date and time via a PC using the Windows XP,
Vista or 7 operating system; this socket is located on
the right-hand side under the flap:

The USB cable, order no. 32032, which is included
with the set is to be connected to this jack. The pro­cedure for carrying out a software update via a PC is
described on page 50.

The PC software required, as well as the 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 driver and software is installed
on the PC, this USB connection can be used to up­date the transmitter or even just to set the transmit­ter’s date and time. To set the transmitter’s date and
time by way of this jack, refer to the »Info display«
menu, beginning page 278.

Note:

mc-16 HoTT and m c- 20 HoTT transmitters can

also be charged using this USB socket at the stand­ard currents present at USB ports; see page 16.

25Transmitter description - Face-side connections

Bottom side transmitter interior

(The illustration shows the mc- 20 HoTT transmitter.)

Lithium battery CR2032 (not rechargeable)
Independent backup for the transmitter's date

and time settings, see »Info display« menu on
page 278.

Sockets for optional transmitter controls and
switches

(In principle you can connect the switches in any
order, but we strongly recommend that you main­tain the same sequence as the case legends to
avoid confusion.)

Socket for optional Bluetooth module

Order No. 33002.5

RF modul

SW16/PB18 (when transmitter is closed),
see “Physical control, switch and control

switch assignments” on page 68

Transmitter battery plug

For charging the battery and a list
of suitable automatic chargers, see
page 16

Transmitter description - Bottom side transmitter interior

26

SW17/PB19 (when transmitter is closed),

see “Physical control, switch and control
switch assignments” on page 68

Notes:
Disconnect the transmitter battery at its connec­tor when performing any type of work inside the
transmitter. Never allow solder points to come
into contact with objects as this can create short
circuit conditions.

All jacks and plugs not described are to be left
unconnected.

27For your notes

Display and keypad

(The illustration shows the control pad of the mc- 20 HoTT transmitter.)

left four-way button:

ESC = select/confirm
ESC touched for about 1 s: Changeover between

telemetry menu and basic display

= scroll in one of the four directions with every

tap (, , , )
simultaneous horizontal tap ()
= changeover between basic display and servo

display

simultaneous vertical tap of the left

+

() keys + "SET" of the right four­way button = changeover to the "secret
options", see page 34.

Flight phase name

see menu »Phase settings«, page 152 or 156

Model memory location

mc-16: 1 … 20
mc- 2 0 : 1 … 24

Model type indicator
winged model, heli­copter

Model name

No

pupil

signal!

Throttle

too

high!

Batt. must

be re-

charged!!

Fail Safe

setup

A selection of potential warnings and notices. More about this on

page 33.

Stopwatch in min:s

micro-SD card
inserted

(upward/downward)

Flight timer in min:s

Flight phase timer display, if available;
see “Flight phase timers”, page 166.

t.b.d.

Transmitter battery voltage with dynamic bar indicator. If the
lithium battery voltage underruns the 3.60 V (adjustable)
threshold a warning message will appear and an acoustic
warning will sound. (Switchover for NiMH batteries.)

Transmitter operating time. This will automatically be reset to zero after a
charging process.

Display diagram for all four digital trim levers with numeric indicator and
direction indicator

Transmitter description - Display and keypad

28

M = Model
operation
P = Pupil
(pupil
transmitter)

Signal strength

Operating mode

Receiver battery
voltage RX-SPG

right four-way button:

SET = select/confirm

= scroll or change value with every touch of one

of the four direction
symbols (, , , )

Circle with the finger around the circumference
= scroll/change values. Alternative values selec-

tion with the left four-way button (, , , )

or

simultaneous tap on 
or  = CLEAR

Operating the “data terminal“

Entry keys ESC and SET

Display symbols

Displayed telemetry symbols

the active model memory has not yet been

“bound” to a HoTT receiver. More about the
“Binding” process can be found on page 87
or 95.

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

signal strength indicator of the connection to

>M

the model

signal strength indicator of the connection to

>P

the pupil transmitter in the display of the teach­er transmitter for wireless teacher/pupil opera­tion

Keys left of the display

• ESC key
each brief tap on the ESC key will cause a step-

wise return in function selection 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.

• Selection keys  

1. A tap on one of these keys will scroll, appropri-

ate for the given arrow direction, through lists,
such as through the model selection list or the
multi-function list or within menus though the
menu‘s lines.

2. A brief simultaneous tap on the  keys will

cause a switch from the transmitters base
screen, as well as from almost any menu posi­tion, into the »Servo display« menu.

Keys to the right of the display

• SET key

1. After switching the transmitter on, a brief tap

2. Within menus having settings, activate / deacti-

• Selection keys  

1. “Leafing through” the multi-function menu, and

2. Select or set parameters in setting fields af-

3. A brief simultaneous tap on the  or 

Notes:

• In contrast to the four-way buttons of the
HoTT transmitter, which are “pressed” in the same
way as micro-switches, the touch-sensitive Cap­Touch buttons of the mc-2 0 HoTT respond to
the lightest of touches.

• Touching the given four-way button does not itself
initiate the given action but rather the end of the
touch.

• In the event the four-way buttons 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

on 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.

vate (confirm) the given setting fields with a tap
on the SET key.

the menu lines within the set-up menus, in the
same manner as the Select buttons of the left­hand four-way button, or – on the
transmitter – in the same manner as “circling”
over the four Select buttons.

ter their activation with a tap on the SET key,
whereby the  and  keys will have the
same given function. In this case it is complete­ly irrelevant which of these two keys are used.

keys will set a changed parameter value in the
entry field back to its default value (CLEAR).

mc- 2 0

mc-16

then wait for several seconds before switching it
on again.

29Transmitter description - Operating the “data terminal“

Shortcuts

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

• CLEAR
A brief simultaneous tap on the  or  keys

of the right four-way button will reset a changed
para meter value in the active entry field back to its
default value.

• »Servo display«
A brief simultaneous tap on the  keys of the

left four-way button will change from the transmit­ter’s base screen or from almost any menu posi­tion to the »Servo display« menu, see page 274.

• »Telemetry« menu
Tap the center ESC key of the left four-way but-

ton for about 1 s to call up the »Telemetry« menu
from the transmitter’s base screen or return to the
base screen again, see text beginning on page

228.

• Graphic display of telemetry data

Briefly touching one of the selection keys of the
left or right four-way button 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.

A brief tap on the center ESC or SET key will
cause a return back to the base screen.

• »SECRET MODE«
(Language selection, Firmware update, Stick
calibration etc.)

Touch and hold the  selection keys of the left
four-way button then momentarily touch the SET
key of the right four-way button, see text beginning
on page 34.

• Entry lockout
Entry lockout is activated and deactivated from the

base screen by simultaneously touching the ESC
and SET keys for about 2 s.

• Quick-Select

Transmitter description - Shortcuts

30

From the multi-function list, a jump can be made
into a “Structure overview” by way of a brief, si­multaneous tap on the  or  keys of the
right four-way button. Menus are arranged in clear
groups in this overview.

All menus

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

Now the desired group can be selected with the
 selection keys of the left or right four-way but­ton …

All menus

Memory

Servo setting
Transm. controls
Switches
Flight phases

… then finally tap the center SET key of the right
four-way button briefly. 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

Now you can select the desired menu point us­ing the  or  buttons, and then call it up by
pressing the SET button of the right-hand four-way
button.