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1
Contents
Contents
Program descriptions in detail
Page Page
Memories
Model select 59 59
Copy / Erase 60 60
Suppressing codes 62 62
Suppressing models 62 62
Basic transmitter, model and servo settings
Base setup model 64 66
Model type 70
Helicopter type 72
Servo adjustment 74 74
Transmitter controls
Stick mode 76 77
Transmitter control settings 78 80
Throttle limit 82
Dual Rates / Exponential 86 88
Channel 1 curve 90 92
Switches
Switch display 93 93
Control switches 94 94
Logical switches 97 97
Flight phases
How do I program a fl ight phase? 98 98
Phase settings 100 102
Phase assignment 104 104
Phase trim F3B 105
Non-delayed channels 105 105
2
Page Page
Timers
Timers (general) 106 106
Flight phase timers 108 108
Mixers
What is a mixer? 110 110
Wing mixers 110
Helicopter mixers 122
Setting up the throttle and
collective pitch curve 129
Auto-rotation 132
General notes on freely
programmable mixers 134 134
Free Mixers 135 135
MIX aktive in phase 142 142
Mix only channel 142 142
Dual mixers 144 144
Swashplate mixers 145
Special functions
Fail-Safe settings, PCM 20 146 146
Fail-Safe settings, SPCM 20 148 148
Fail-Safe settings, APCM 20 149 149
Trainer (teacher / pupil) mode 150 150
Receiver output swap 153 153
Global functions
General basic settings 154 154
Servo display 156 156
Servo test 156 156
Code lock 157 157
General notes
Safety notes ............................................................... 4
Foreword .................................................................... 7
mx-24s Computer System ....................................... 8
Operating notes ....................................................... 12
DSC socket .............................................................. 18
Description of transmitter ......................................... 20
Description of screen ............................................... 22
Using the system for the fi rst time ........................... 23
Preliminary notes ................................................ 23
Selecting the language ....................................... 23
Frequency scanner ............................................. 24
Selecting the channel ......................................... 25
Receiving system .................................................... 26
Installation notes ................................................ 27
Defi nition of terms ................................................... 28
Signal fl ow chart ................................................. 29
Basic operations ...................................................... 30
Button pad .......................................................... 30
Rotary control ..................................................... 30
Hotkeys ............................................................... 30
Menu settings ..................................................... 31
Assigning transmitter controls,
switches and control switches ................................. 32
Digital trims / Cut-off trim ......................................... 34
Fixed-wing model aircraft ........................................ 36
Receiver socket sequence ................................. 37
Model helicopters .................................................... 42
Receiver socket sequence ................................. 43
Programming – a brief introduction
Brief programming instructions ................................ 44
Program descriptions
Setting up a new model memory ............................. 58
Programming examples
Fixed-wing models (general) ................................. 158
Fixed-wing model gliders ....................................... 160
Including an electric power system ........................ 165
C1 stick doubling as control for:
Electric motor and butterfl y (crow) .................... 167
Electric motor and airbrakes ............................. 169
Operating timers using a stick function or switch ... 170
Servos running in parallel ...................................... 172
Two airbrake or spoiler servos .......................... 172
Multi-motor power models ................................ 172
Two elevator servos .......................................... 173
Two rudder servos ............................................ 173
Using fl ight phases ................................................ 174
Controlling timed sequences ................................. 182
Eight-fl ap wing ....................................................... 184
Delta / fl ying wing model aircraft ............................ 188
F3A models ........................................................... 192
Model helicopters .................................................. 196
Appendix
Trainer system accessories ................................... 204
Transmitter accessories ......................................... 205
Approved operating frequencies ............................ 206
Conformity declaration ........................................... 207
Index ...................................................................... 208
Guarantee certifi cate ............................................. 215
3
Contents
Notes on environmental protection
The presence of this symbol on a product,
in the user instructions or the packaging,
means that you must not dispose of that
item, or the electronic components contai-
ned within it, in the ordinary domestic was-
te when the product comes to the end of its useful life.
The correct method of disposal is to take it to your lo-
cal collection point for recycling electrical and electro-
nic equipment.
Individual markings indicate which materials can be
recycled and re-used. You can make an important
contribution to the protection of our shared environ-
ment by re-using the product, recycling the basic ma-
terials or re-processing redundant equipment in other
ways.
Dry cells and rechargeable batteries must be remo-
ved from the device and taken separately to a suitab-
le battery disposal centre.
If you don’t know the location of your nearest disposal
centre, please enquire at your local authority offi ce.
Environmental
protection notes
We all want you to have many hours of pleasure in
our mutual hobby of modelling, and safety is an im-
portant aspect of this. It is absolutely essential that
you read right through these instructions and take ca-
reful note of all our safety recommendations.
If you are a beginner to the world of radio-controlled
model aircraft, boats and cars, we strongly advise
that you seek out an experienced modeller in your
fi eld and ask him for help and advice.
These instructions must be handed on to the new ow-
ner if you ever sell or dispose of the transmitter.
Application
This radio control system may only be used for the
purpose for which the manufacturer designed it, i.e.
for operating radio-controlled models which do not
carry humans. No other type of use is approved or
permissible.
Safety notes
SAFETY IS NO ACCIDENT
and
RADIO-CONTROLLED MODELS ARE NOT
PLAYTHINGS
Even small models can cause serious personal inju-
ry and damage to property if they are handled incom-
petently.
Technical problems in electrical and mechanical sys-
tems can cause motors to rev up or burst into life un-
expectedly, with the result that parts may fl y off at gre-
at speed, causing series injury.
Short-circuits of all kinds must be avoided at all times.
Short-circuits can easily destroy parts of the radio
control system, but even more dangerous is the acu-
te risk of fi re and explosion, depending on the circum-
stances and the energy content of the batteries.
Propellers (aircraft and boat), helicopter rotors, open
gearboxes and all other rotating parts which are dri-
ven by a motor or engine represent a permanent in-
jury hazard. Do not touch these items with any object
or part of your body. Remember that a propeller spin-
ning at high speed can easily slice off a fi nger. Ensu-
re that no other object can make contact with the dri-
ven components.
Never stand in the primary danger zone, i. e. in the
rotational plane of the propeller or other rotating parts,
when the motor is running or the drive battery is con-
nected.
If an internal-combustion engine or electric motor is
connected to the system, take great care to avoid
any possibility of it bursting into life when you are pro-
gramming the transmitter. We recommend that you
disconnect the fuel supply or the drive battery before-
hand.
Protect all electronic equipment from dust, dirt, damp,
and foreign bodies. Avoid subjecting the equipment
to vibration and excessive heat or cold. Radio control
equipment should only be used in “normal” ambient
temperatures, i. e. within the range -15°C to +55°C.
Avoid subjecting the equipment to shock and pressu-
re. Check the units at regular intervals for damage to
cases and leads. Do not re-use any item which is da-
maged or has become wet, even after you have dried
it out thoroughly.
Use only those components and accessories which
we expressly recommend. Be sure to use only genui-
ne matching GRAUPNER connectors of the same de-
sign with contacts of the same material. If you are still
using plug-in crystals, use only genuine GRAUPNER
crystals on the appropriate frequency band.
When deploying cables note that they must not be un-
der tension, and should never be bent tightly or kin-
ked, otherwise they may fracture. Avoid sharp edges
which could wear through the cable insulation.
Check that all connectors are pushed home fi rmly be-
fore using the system. When disconnecting compon-
ents, pull on the connectors themselves – not on the
wires.
It is not permissible to carry out any modifi cations
to the RC system components. Avoid reverse polari-
ty and short-circuits of all kinds involving the connec-
ting leads, as the equipment is not protected against
such errors.
Installing the receiving system and deploying the
receiver aerial
In a model aircraft the receiver must be packed in
soft foam and stowed behind a stout bulkhead, and
in a model boat or car should be protected effectively
from dust and spray.
The receiver must not make contact with the fuselage,
hull or chassis at any point, otherwise motor vibration
and landing shocks will be transmitted directly to it.
When installing the receiving system in a model po-
wered by a glowplug or petrol engine, be sure to in-
stall all the components in well-protected positions
so that no exhaust gas or oil residues can reach the
units and get inside them. This applies above all to
the ON / OFF switch, which is usually installed in the
outer skin of the model.
Secure the receiver in such a way that the aerial, ser-
vo leads and switch harness are not under any strain.
The receiver aerial is permanently attached to the re-
ceiver. It is about 100 cm long and must not be shor-
tened or extended. The aerial should be routed as far
away as possible from electric motors, servos, me-
tal pushrods and high-current cables. However, it is
best not to deploy the aerial in an exactly straight line,
but to angle it: e. g. run it straight to the tailplane, then
leave the fi nal 10 - 15 cm trailing freely, as this helps
to avoid reception “blind spots” when the model is in
the air. If this is not possible, we recommend that you
lay out part of the aerial wire in an S-shape inside the
model, close to the receiver if possible.
Safety notes
Please read carefully!
4Safety notes
Installing the servos
Always install servos using the vibration-damping
grommets supplied. The rubber grommets provide
some degree of protection from mechanical shocks
and severe vibration.
Installing control linkages
The basic rule is that all linkages should be installed
in such a way that the pushrods move accurate-
ly, smoothly and freely. It is particularly important that
all servo output arms can move to their full extent wit-
hout fouling or rubbing on anything, or being obstruc-
ted mechanically at any point in their travel.
It is important that you can stop your motor at any
time. With a glow motor this is achieved by adjusting
the throttle so that the barrel closes completely when
you move the throttle stick and trim to their end-points.
Ensure that no metal parts are able to rub against
each other, e. g. when controls are operated, when
parts rotate, or when motor vibration affects the mo-
del. Metal-to-metal contact causes electrical “noise”
which can interfere with the correct working of the re-
ceiver.
Always extend the transmitter aerial fully before
operating your model
Transmitter fi eld strength is at a minimum in an ima-
ginary line extending straight out from the transmit-
ter aerial. It is therefore fundamentally misguided to
“point” the transmitter aerial at the model with the idea
of obtaining good reception.
When several radio control systems are in use on ad-
jacent channels, the pilots should always stand to-
gether in a loose group. Pilots who insist on standing
away from the group endanger their own models as
well as those of the other pilots.
Pre-fl ight checking
If there are several modellers at the site, check ca-
refully with all of them that you are the only one on
“your” channel before you switch on your own trans-
mitter. If two modellers switch on transmitters on the
same channel, the result is interference to one or
both models, and the usual result is at least one wre-
cked model.
Before you switch on the receiver, ensure that the
throttle stick is at the stop / idle end-point.
Always switch on the transmitter fi rst, and only
then the receiver.
Always switch off the receiver fi rst, and only then
the transmitter.
If you do not keep to this sequence, i. e. if the recei-
ver is at any time switched on when “its” transmitter
is switched off, then the receiver is wide open to sig-
nals from other transmitters and any interference, and
may respond. The model might then carry out uncon-
trolled movements, which could easily result in perso-
nal injury or damage to property. The servos may run
to their end-stops and damage the gearbox, linkage,
control surface etc.
Please take particular care if your model is fi tted with
a mechanical gyro:
Before you switch your receiver off, disconnect the
power supply to ensure that the motor cannot run up
to high speed accidentally.
Gyros can generate such high voltages as they
run down that the receiver picks up apparently
valid throttle commands, and the motor could re-
spond by accelerating unexpectedly.
Range checking
Before every session check that the system works
properly in every respect, and has adequate range.
This means checking that all the control surfaces re-
spond correctly and in the appropriate direction to the
transmitter commands, at a suitable ground range.
Repeat this check with the motor running, while an
assistant holds the model securely for you.
Operating your model aircraft, helicopter, boat or
car
Never fl y directly over spectators or other pilots, and
take care at all times not to endanger people or ani-
mals. Keep well clear of high-tension overhead cables.
Never run your model boat close to locks and full-
size boats. Model cars should never be run on public
streets or motorways, footpaths, public squares etc..
Checking the transmitter and receiver batteries
It is essential to stop using the radio control system
and recharge the batteries well before they are com-
pletely discharged. In the case of the transmitter this
means – at the very latest – when the message “Bat-
tery must be charged” appears on the screen, and
you hear an audible warning signal.
It is vital to check the state of the receiver battery at
regular intervals. When the battery is almost fl
at you
may notice the servos running more slowly, but it is
by no means safe to keep fl ying or running your mo-
del until this happens. Always replace or recharge the
batteries in good time.
Keep to the battery manufacturer’s instructions and
don’t leave the batteries on charge for a longer peri-
od than stated. Do not leave batteries on charge un-
supervised.
Never attempt to recharge dry cells, as they may ex-
plode.
Rechargeable batteries should always be rechar-
ged before every session. When charging batteries
it is important to avoid short-circuits. Do this by con-
necting the charge lead banana plugs to the charger
fi rst, taking care to maintain correct polarity. Only then
connect the charge lead to the transmitter or receiver
battery.
Disconnect all batteries and remove them from your
model if you know you will not be using it in the near
future.
5
Safety notes
Capacity and operating times
This rule applies to all forms of electrical power sour-
ce: capacity is greatly reduced at low temperatures,
i. e. operating times are shorter in cold conditions.
Frequent charging of batteries, and use of battery
maintenance programs, can also result in a gradual
loss of battery capacity. For this reason you should al-
ways check the actual capacity of your packs at regu-
lar intervals - every six months at least.
Purchase only genuine GRAUPNER batteries!
Suppressing electric motors
All conventional electric motors produce sparks bet-
ween commutator and brushes, to a greater or lesser
extent depending on the motor type; the sparking ge-
nerates serious interference to the radio control sys-
tem.
In electric-powered models every motor must there-
fore be thoroughly suppressed. Suppressor fi lters ef-
fectively eliminate such interference, and should al-
ways be fi tted.
Please read the notes and recommendations sup-
plied by the motor’s manufacturer. Refer to the main
GRAUPNER FS catalogue for more information on
suppressor fi lters.
Servo suppressor fi lters for extension leads
Order No. 1040
Servo suppressor fi lters are required if you are obli-
ged to use long servo extension leads, as they elimi-
nate the danger of de-tuning the receiver. The fi lter is
connected directly to the receiver input. In very diffi -
cult cases a second fi lter can be used, positioned clo-
se to the servo.
Using electronic speed controllers
Electronic speed controllers must be chosen to suit
the size of electric motor which they will control.
There is always a danger of overloading and possibly
damaging the speed controller, but you can avoid this
by ensuring that the controller’s current-handling ca-
pacity is at least half the motor’s maximum stall cur-
rent.
Particular care is called for if you are using a “hot” (i. e.
upgrade) motor, as any low-turn motor (small number
of turns on the winding) may draw many times its no-
minal current when stalled, and the high current can
easily wreck the speed controller.
Electrical ignition systems
Ignition systems for internal combustion engines can
also produce interference which has an adverse ef-
fect on the operation of the radio control system.
Electrical ignition systems should always be powered
by a separate battery – not the receiver battery.
Be sure to use effectively suppressed spark plugs
and plug caps, and shielded ignition leads.
Keep the receiving system an adequate distance
away from the ignition system.
Static charges
The operation of a radio control system can be affec-
ted by magnetic shock waves which are generated by
lightning – even when the storm is several kilometres
away. For this reason …
… if you see a storm approaching, cease opera-
tions immediately! Static charges via the trans-
mitter aerial also constitute a lethal danger!
Caution
Radio control systems may only be operated on the
frequency bands and spot frequencies which are ap-
proved for that purpose in the country in which the
equipment is used. Information on this can be found
in the section entitled “Approved Operating Frequen-
cies” on page 206. It is prohibited by law to use radio
control systems on any other frequency, and such mis-
use will be punished by the relevant authorities.
Care and maintenance
Don’t use cleaning agents, petrol, water or other sol-
vents to clean this equipment. If the case, the whip
aerial etc. should become soiled, wipe clean with a
soft dry cloth.
Components and accessories
As manufacturer of this equipment, GRAUPNER
GmbH & Co. KG recommends that you only use com-
ponents and accessories which have been checked
by GRAUPNER and are known to work properly and
reliably. If you observe this advice, GRAUPNER ac-
cepts product responsibility.
GRAUPNER does not accept liability if this equip-
ment is used in conjunction with components or
accessories made by other manufacturers which
have not been approved. We are not in a position
to assess whether every individual product made
by other companies can be used with safety.
Liability exclusion / Compensation
As manufacturers, we at GRAUPNER are not in a po-
sition to infl uence the way you install, operate and
maintain the radio control system components. For
this reason we are obliged to refute all liability for loss,
damage or costs which are incurred due to the in-
competent or incorrect use and operation of our pro-
ducts, or which are connected with such operation in
any way.
Unless otherwise prescribed by law, the obligation of
the GRAUPNER company to pay compensation is li-
mited to the invoice value of that quantity of GRAUP-
NER products which was immediately and directly in-
volved in the event in which the damage occurred.
This does not apply if GRAUPNER is found to be sub-
ject to unlimited liability according to binding legal re-
gulation on account of deliberate or gross negligence.
6Safety notes
Safety notes
The new mx-24s is presented in a sophisticated, er-
gonomically effi cient hand-held case which offers ma-
ximum operating convenience and ease of transport.
It represents a further development of the mc-24
PROFI, of which many thousands are already in use
by highly successful modellers. The system’s opera-
ting convenience has been further improved: the pro-
gramming procedure is now even easier, using just
four buttons and a digital 3-D ROTARY control knob
which operates on two levels. As with its smaller sis-
ter, the mx-22, the new transmitter is easy to use
even for the inexperienced modeller.
We have called upon the experience and feedback of
many pilots in handling and using the mc-24 PRO-
FI to create new ideas which have been incorporated
into the overall software design of the mx-24s.
The GRAUPNER software team, collaborating with
renowned top-level pilots from all over the world, and
professional and competition pilots in a vast range of
model fl ying areas, has worked ceaselessly to pro-
duce this pioneering further development of high-end
transmitter software. Teamwork and thorough testing
in national and international competitions and events
of all disciplines have helped to create this new sys-
tem, based on the world-wide success of the mc-24
radio control system, without in any way overlooking
the requirements of beginners.
The mx-24s is equipped as standard with all controls
and switches required for operating up to twelve ser-
vos, which means that fans of scale models and mul-
ti-function model boats will not fi nd themselves run-
ning short of functions or control options.
Another standard feature is a DSC socket for connec-
ting a receiver directly to the transmitter, allowing wor-
king systems to be checked without the transmitter
radiating an RF signal. The same socket can also be
used for Trainer mode operations and for controlling
fl ight simulators.
The familiar modulations of PPM18, PPM24, PCM20
and SPCM 20 are now complemented by two new
transmission modes:
• PPM10 for Pico-size receivers in indoor models,
fun-fl y aircraft, small helicopters, RC cars and
other models fi tted with a maximum of fi ve servos.
This transmission mode features a reduced cycle
rate, giving extremely fast response times.
• APCM24 is for the demanding pilot who wishes to
operate his models with up to twelve servos, and
is designed to satisfy exacting demands on pre-
cision and identical timing of all servos – e. g. in
high-speed models.
A new RF SYNTHESIZER module eliminates the
need for plug-in crystals on the 35 / 35B MHz band
and the 40 / 41 MHz band. The channel you wish
to use is set by software, and is available for use as
soon as you answer a security query. An important in-
novation in terms of safety considerations is the en-
tirely new integrated dual-conversion scanner, which
can be used when the transmitter is switched on to
check whether a particular channel is already in use
at your fl ying site.
In terms of hardware, the generously sized LCD
screen now features backlighting which makes the
display much easier to read, especially under unfa-
vourable lighting conditions. An EEPROM (Electrical-
ly Erasable Programmable Read-Only Memory) su-
persedes the Lithium data back-up battery which has
been necessary until now.
The structure of the transmitter software has been
further refi ned: all the important adjustment facili-
ties in each menu are now displayed on the graphic
screen in a form which is virtually self-explanatory.
However, if you encounter a problem and the manual
is not to hand, the integral Help menu can provide ad-
ditional assistance at the press of a button.
The mx-24s provides forty model memories, each of
which can store model settings for up to eight fl ight
phases. Flight phases can be called up in fl ight simply
by operating a switch, so that you can try out different
settings quickly and without risk. This feature can be
exploited for test purposes as well as for varying fl ight
parameters in different phases of fl ight.
mx-24s: the new generation of radio control technology
Amongst the new features of the software are:
• “Auto-Trim” function: the model is brought to the
desired fl ight attitude using the two dual-axis
sticks. At the moment the auto-trim switch is ope-
rated, the software notes the deviations of the
sticks from the neutral position, and sets them as
the new trim values.
• “Swashplate limit”: this option limits the swashpla-
te defl ection when the roll (aileron) and pitch-axis
(elevator) sticks are moved to their end-points si-
multaneously.
The software package is rounded off by a range of
new, thoroughly practical features, such as a button
pad lock, a variable warning threshold for the trans-
mitter battery and a simplifi ed method of switching
between electric motor and airbrake control.
This manual describes each menu in detail, and also
provides dozens of useful tips, notes and program-
ming examples to complement the basic informati-
on. More general modelling terms, such as Transmit-
ter controls, Dual-Rates, Butterfl y and many others,
are all explained in the manual, which also includes a
comprehensive index at the end. The section on pa-
ges 44 … 56 includes a quick-access overview of the
essential operating procedures in tabular form.
Please read the Safety Notes and the Technical In-
formation. We recommend that you start by che-
cking all the functions as described in the instructions.
When you have programmed a model it is important
to ensure on the ground that all the programmed set-
tings are correct before committing the model to the
air. Always handle your radio-controlled model with
a responsible attitude to avoid endangering yourself
and others.
All of us in the GRAUPNER team wish you every suc-
cess and many years of pleasure with your mx-24s,
which is a radio control system of the very highest
quality.
Kirchheim-Teck, April 2008
7
Foreword
mx-24s
Radio control system providing 5 to 9 control functions in PPM10 / PPM18 mode, up to 10
functions in (S)PCM mode and up to 12 control functions in PPM24 and APCM24 modes
• Four-language dialogue menu (German, English,
French, Italian).
• The latest hardware and integral Synthesizer sys-
tem for channel selection, with safety menu to avo-
id problems if the transmitter is switched on acci-
dentally.
• Completely new “Auto-Trim” function: press a sing-
le button to adopt the current stick positions as the
new neutral settings, with a gradual transition to
the new trims.
• Simple method of programming the dual use of
the C1 stick for controlling the motor and braking
system of electric gliders.
• Display of type of modulation and spot frequency
on the LCD screen.
• Automatic transmitter control assignment by ope-
rating the control itself.
• Forty model memories.
• Update-capable software ensures that the trans-
mitter has an extended future life.
• 3-D cylinder rotary encoder in conjunction with
four programming buttons provides accurate ad-
justment facilities and excellent programming con-
venience.
• High-resolution MULTI-DATA GRAPHIC LCD
screen with grey-scales provides superb monito-
ring facilities, accurate graphical representation of
curves, characteristic lines, spot frequency etc..
• Screen backlighting variable in the »General
basic settings« menu.
• New type of switch monitor for checking all physi-
cal and control switches.
• CONVENIENT MODE SELECTOR provides a
simple means of switching between stick modes 1
to 4 (e. g. throttle right / throttle left).
• Real Time Processing (RTP). All selected settings
Fantastic technology
GRAUPNER’s new mx-24s sets new standards in
high-end radio control technology. The programs in-
cluded in the mx-24s professional system constitute
a further milestone in radio control technology for the
beginner and pro-standard pilot alike.
A PLL Synthesizer RF module with integral frequen-
cy scanner provides a fast, safe method of switching
8Description of radio control system
channels.
The proven, highly practical dual-function rotary enco-
der with 3-D rotary select programming technology is
ultra-simple to use in combination with modern, logi-
cally structured, clearly laid-out software.
mx-24s: radio control technology which is sheer ple-
asure to use!
and changes take immediate effect at the receiver
output, virtually in real time.
• Digital Trim system for all four stick trim functions,
effective globally or separately for each fl ight pha-
se, variable separately for each function, with ad-
justable trim increment and instant-effect throttle /
idle trim.
• Six switchable types of modulation:
PPM10
Super-fast modulation for Pico-size receivers, sui-
table for controlling up to fi ve servos. Ideal for RC
cars, indoor models, fun-fl y aircraft etc..
PPM18
The most widely used standard transmission pro-
cess (FM and FMsss). For C 6, C 8, C 12, C 16,
C 17, C 19, DS 18, DS 19, DS 20 receivers,
and XP 4, XP 8, XP 10, XP 12, XN 12, XM 16,
R16SCAN, R 600 light, R 600, R 700, C 6 FM,
SB6 SYN 40 S, SR6SYN miniature receivers.
PPM24
Multi-servo PPM transmission mode for simulta-
neous operation of up to twelve servos. For the
DS 24 FM S receiver.
PCM20
PCM with system resolution of 512 steps per con-
trol function. For mc-12, mc-20, DS 20 mc recei-
vers.
SPCM20
Super PCM modulation with high system resolu-
tion of 1024 steps per control function. For smc-
14 S, smc-16 SCAN, smc-19, smc-19 DS, smc-20,
smc-20 DS, smc-20 DSYN, smc-20 DSCAN recei-
vers.
APCM24
Advanced PCM modulation with high system reso-
lution and ultra-fast transmission process, for amc
receivers. Capable of controlling up to twelve ser-
vos.
• Twelve freely programmable mixers for fi xed-wing
models and helicopters with freely selectable input
and output function, four of which exploit a new
type of eight-point curve technology which is freely
variable in 0.5% increments. Using ingenious poly-
nomial approximation techniques an ideally roun-
ded mixer curve can be generated from the selec-
ted mixer reference points simply by pressing a
button.
• The eight-point throttle and collective pitch cur-
ves available in the helicopter menu also feature
a multi-point curve system (MPC). Once again an
ideally rounded curve can be generated, based on
your selected mixer reference points.
• Four dual mixers.
• Eight fl ight phase programs for fi xed-wing model
aircraft, and seven + auto-rotation for model heli-
copters. These can be adjusted individually to suit
particular models, and assigned names and sepa-
rately programmable transition times.
• Super-menu for servos, providing a full overview
of all servo set-up data and simple correction of
four parameters (direction of rotation, centre posi-
tion, servo travel separately in both directions, and
servo limit variable separately in both directions,
for all twelve servos).
• Super Dual Rate / Expo menu for three control
functions and eight fl ight phases. Variable sepa-
rately in each model memory, and switchable in
fl ight.
• Expanded transmitter control menu: centre adjus-
tment at input end. The side-mounted proportio-
nal controls, the INC / DEC buttons, the C1 control
and all the switches can be assigned as transmit-
ter controls.
• Highly practical, sophisticated multi-function menu
9
Description of radio control system
for fi xed-wing models and helicopters. Entering the
number of aileron and camber-changing fl ap ser-
vos automatically programs all the requisite mixer
functions in the multi-function wing menu.
• Re-designed multi-fl ap menu, providing an ultra-
simple, clearly laid-out means of setting up a ma-
ximum of six wing-mounted servos, variable sepa-
rately for each fl ight phase, even without the use
of supplementary free mixers.
• Helicopter swashplate mixer for one-point, two-
point, three-point and four-point linkages.
• Swashplate servo linearisation function: electronic
compensation for non-linear travel of rotary-output
swashplate servos.
• Swashplate limiting: limits the angle of tilt of the
swashplate when roll and pitch-axis commands
are applied simultaneously.
• Tailplane types: normal, V-tail, delta / fl ying wing
and 2 EL Sv 3 + 8 (which provides a standard
means of controlling two linked elevator servos wi-
thout the use of free mixers or dual mixers).
• Number of wing fl aps: 2 AIL / 4 FL: full support for
six wing-mounted servos, now also without the
use of free mixers.
• Switchable delay for fl ight phase change-over swit-
ches: the transition time can be switched off for in-
dividual channels in individual fl ight phases; e. g.
for motor OFF in electric-powered models, and for
heading lock activate / disable in model helicop-
ters.
• Ten supplementary user-defi ned phase names: in
addition to the default fl ight phases the user can
enter ten phase names of his own choice.
• Model copy function for all model memories.
• Copy all models PC. All occupied memories can
be backed-up to a PC using a single command.
• Integral socket accepts an optional interface mo-
dule for copying between two mx-24s transmitters
or between an mx-24s and a PC.
• “Info” in the »Base setup model« menu: a small
amount of supplementary information can be en-
tered at this point for each model (max. fi fteen let-
ters or symbols); this information then appears in
the revised Model Select menu.
• Logical switches: this function makes it possible to
link two switches using an “AND” or “OR” function;
the result can then be used as a virtual switch.
• Variable warning threshold for power-on “Throttle
too high” warning in the Helicopter menu.
• Fail-Safe monitor for eight servo functions; for up
to twelve servos in APCM24 mode.
• HELP button provides valuable hints on program-
ming and currently selected programming menu.
Leaf through the Help pages using the HLP button
or the rotary control.
• Convenient Timer menu: system includes eight
stopwatches, alarm timer, count-down timer, lap
counter etc., two time values and one lap time va-
lue can be displayed on-screen simultaneously in
a large typeface.
• Stopwatch with History function: the lap counter is
complemented by “Time1”, which records power-
on times, and “Time2”, which records the ON and
OFF switched times separately.
• Highlighted display of timer over-runs are more
easily picked out by the user.
• Revised CLEAR function for the timers: even if in-
dividual times are still running, CLEAR still resets
the remaining timers.
• Separate operating time recorder for each model.
• Slot time can be recorded by pressing the rota-
ry control + ESC button, and then reset using the
CLR button.
• Transmitter operating hours timer is automatically
reset to zero when the battery is recharged.
• Prepared as standard for use as Pupil or Teacher
transmitter in a Trainer system.
Operational security and operating convenience
• SYNTHESIZER RF module with integral scan-
ner function exploiting dual-conversion technology:
checks frequency band for occupied channels.
• Selectable button pad lock prevents accidental
and unwanted changes during fl ight operations.
• Input lock using code number.
• Warning beep and pop-up on-screen message if
Trainer connection is incorrect.
• Variable warning threshold for battery voltage.
• Non-volatile memory for data back-up even when
the transmitter battery is discharged or removed.
• Rotary control Enter function: the software always
interprets a brief press on the rotary control as
ENTER. In the Model Select and Function Select
menus it is possible to select an item and call it up
using the rotary control alone.
• Hotkeys for contrast adjustment, servo display
(from virtually all menus), button pad lock and mo-
del select.
• The servo sequence at the receiver output can be
changed in the software.
• Model icons: graphic display of the model type
(fi xed-wing / helicopter).
• Clearly arranged character table for simplifi ed
name input procedure.
mx-24s
10 Description of radio control system
mx-24s micro-computer radio control system
Transmitter alone, with PLL Synthesizer RF module
and rechargeable transmitter battery installed, in alu-
minium case:
Order No. 4730.77 35/35B MHz band
Order No. 4748.77 40/41* MHz-Band
* 41 MHz band only approved for use in France.
Specifi cation – mx-24s transmitter
Transmission system Switchable: SPCM20, PCM20, PPM10,
PPM18, PPM 24, APCM24
Radio Frequency
section Synthesizer (10 kHz spacing), 35 / 35B,
40 / 41 MHz band
Spot frequencies 35-MHz band: chan. 61-80, 281*, 282*
35-MHz-B band: channels 182 ... 191
40-MHz band: chan. 50 ... 59, 81 ... 92
41-MHz band: channels 400 ... 420**
Channel spacing 10 kHz
Max. control func-
tions SPCM20 = 10, PCM20 = 10, APCM24 =
12, PPM10 = 5, PPM18 = 9, PPM24 =12
Control functions Four proportional functions with digi-
tal trims, two proportional functions, two
switched functions, two INC / DEC but-
tons
Channel pulse width 1,5 ms ± 0,5 ms
Control resolution SPCM20/APCM24: 10 Bit (1024 steps),
PCM20: 9 Bit (512 steps)
Aerial Telescopic aerial, ten sections, approx.
1150 mm long
Operating voltage 9,6 ... 12 V
Current drain approx. 85 mA (RF module removed)
150 mA (RF module switched off)
230 mA (RF module switched on)
250 mA (RF module and screen back-
light switched on)
Dimensions approx. 200 x 195 x 98 mm
Weight approx. 1100 g incl. transmitter battery
* Channels 281 and 282 not approved for use in Germany.
** 41 MHz band only approved for use in France.
* For charging the batteries you will also need the transmitter
charge lead, Order No. 3022.
** 12 V power source required.
Chargers and charge leads (optional accessories)
Order No. 6422 Minilader 2
Order No. 6427 Multilader 3
Order No. 6426 Multilader 6E*
Automatic battery chargers with special NiMH charge
programs:
Order No. 6419 Ultramat 5*, **
Order No. 6409 Ultramat 6*, **
Order No. 6410 Ultramat 10*,
Order No. 6412 Ultramat 12*, **
Order No. 6412.200 Ultramat 12*
Order No. 6414 Ultramat 14*,
Order No. 6417 Ultramat 25*, **
Order No. 6417.200 Ultramat 25*
Order No. 6416 Ultra Duo Plus 30*, **
Order No. 6425 Twin Charger
Please refer to the main GRAUPNER FS catalogue
for details of other battery chargers.
Recommended accessories
Order No. Description
70.25 Neckstrap (25 mm)
4178.1 Diagnosis lead
3290.22 Trainer / PC module
4182.9 PC interface lead
mc-22(s)/mx-22/mx-24s/PC
4185 USB PC interface
mc-22(s)/mx-22/mx-24s/PC
Replacement part
Order No. 3100.6 Telescopic transmitter aerial
Please refer to the Appendix and the main GRAUP-
NER FS catalogue for a detailed description of all
available accessories for the mx-24s radio control
set.
Description of radio control system 11
12 Operating notes
Transmitter power supply
The mx-24s transmitter is fi tted as standard with a
9.6 Volt NiMH battery (8NH-2000TX) (specifi cation
may change). However, this battery is not charged
as supplied. When you are using the transmitter you
can monitor the battery voltage on the LCD screen.
If the voltage of the transmitter battery falls below a
certain point (see »General basic settings« menu
– page 154) you will hear an audible warning signal.
The screen then displays the following message to re-
mind you that the transmitter battery needs to be re-
charged:
If this happens, cease operations immediately; ideal-
ly the battery should be recharged before this level is
reached.
Removing the transmitter battery
To remove the transmitter battery fi rst remove the bat-
tery compartment cover on the rear face of the trans-
mitter by sliding it in the direction of the arrow, then lift
it off. Carefully disconnect the con-
nector at the main circuit board –
either pull gently on the cable or pull
out the plug with a fi ngernail, pulling
on the lug on the top of the connec-
tor. Don’t pull the plug up or down
when removing it; keep it parallel
with the circuit board.
Operating notes
Batt must
be re-
charged!!
Charging the transmitter battery
The rechargeable NiMH transmitter battery can be re-
charged via the charge socket fi tted to the right-hand
side of the case.
The transmitter must be switched off and left at “OFF”
for the whole period of the charge process. Never
switch the transmitter on when it is still connec-
ted to the charger; even a very brief interruption
in the charge process can cause the charge volta-
ge to rise to the point where the transmitter is im-
mediately damaged by the excess voltage. For this
reason check carefully that all connectors are secure
and are making really good contact.
Polarity of the mx-24s charge socket
Commercially available bat-
tery charge leads produced
by other manufacturers are
often made up with reversed polarity. For this reason
use genuine GRAUPNER charge leads exclusively.
Caution: it is essential to connect the banana plugs
on the charge lead to the charger fi rst, and only then
to connect the other end of the lead to the charge
socket on the transmitter; this avoids the danger of
short-circuits. Never allow the bare ends of a connec-
ted charge lead to touch each other!
Charging the battery using a standard battery
charger
The basic rule for charging the battery using a stan-
dard charger, i. e. one without automatic charge ter-
mination, is to start with a discharged pack and char-
ge it for fourteen hours at a current corresponding to
one tenth of the capacity printed on the label. In the
case of the standard transmitter battery this means
200 mA. It is up to you to terminate the charge pro-
cess at the correct time.
Charging the transmitter battery using an auto-
matic charger
The transmitter is designed as standard for use with
automatic battery chargers to recharge the transmit-
ter pack.
If you wish to use an automatic charger designed for
NiCd batteries to recharge the NiMH pack which is fi t-
ted to the transmitter as standard, please carry out
a series of test charges and check carefully that the
charger terminates the process correctly. If your char-
ger provides a facility for adjusting the Delta Peak ter-
mination voltage, you may well need to adjust this va-
lue.
Maximum charge current
Do not exceed the maximum permissible charge cur-
rent of 1.0 A, otherwise there is a danger of causing
damage to the transmitter.
Fuse: the transmitter is fi tted with a 20 mm cartridge
fuse (type: 3 Ampere, fast-blow). If the battery will not
accept a charge, or the transmit-
ter cannot be switched on, ple-
ase check this fuse (see “Ope-
ning the transmitter” on page
14). Never by-pass (bridge) the fuse. Replacement fu-
ses can be obtained from any electrical supplies shop.
Ensure that the fuse is fi rmly and correctly seated;
you may need to bend the spring contacts slightly.
On-screen display of battery operating time
#01 0:00h SPCM20
10.9V
0:00h C62
0 0 0 0
Stop watch
Flight tim
000
000
:
:
This timer shows the cumulative operating time of the
transmitter since the last time the transmitter battery
Polarity of trans-
mitter battery plug
brown or
black
red
13
was charged.
This timer is automatically reset to “0:00” when the
transmitter battery voltage is signifi cantly higher than
the last time the unit was switched on, i. e. after a
charge process. This is the state shown in the screen-
shot.
Receiver power supply
Various 4.8 V NiMH batteries are available for the re-
ceiver, varying in capacity. For reasons of safety you
should not use dry cells in model aircraft, helicopters
and other high-speed models. For the same reason
do not use individual cells fi tted in a battery holder;
always use ready-made battery packs with welded or
soldered connections.
There is no direct method of checking receiver battery
voltage when operating a model.
Make it a routine to check the state of your batteries
at regular intervals. Charge your batteries in good
time: don’t wait until you notice the servos running
more slowly than usual before recharging the pack.
Please refer to the main GRAUPNER FS catalogue
for full details of batteries, chargers, measuring
equipment and monitoring units for use with rechar-
geable batteries.
Charging the receiver battery
The charge lead, Order No. 3021, can be connected
directly to the receiver battery for charging. If the bat-
tery is installed in a model and you have fi tted one
of the following switch harnesses: Order No. 3046,
3050, 3934 or 3934.3, then the battery can be char-
ged via the separate charge socket or the charge so-
cket which is built into the switch. The switch on the
switch harness must be left at the “OFF” position for
charging.
Operating notes
General notes on battery charging
• Always connect the charge lead to the charger
fi rst, and only then to the receiver or transmitter
battery. This avoids the danger of accidental short-
circuit between the bare ends of the charge lead.
• Observe the recommendations provided by the
charger manufacturer and the battery manufactu-
rer at all times. Keep to the recommended maxi-
mum charge current stated by the battery manuf-
acturer. To avoid damage to the transmitter, the
charge current should never exceed 1.0 A; you
can usually limit the charge current on the battery
charger itself.
• Do not discharge the battery or carry out battery
maintenance programs via the integral charge so-
cket, as the socket is not suitable for this applicati-
on.
• Never leave batteries on charge unsupervised.
Disposal of dry cells and rechargeable batteries
Never dispose of exhausted batteries in the house-
hold rubbish. As end-user you are legally obliged
(“Battery Disposal Directive”) to return old and ex-
hausted dry cells and rechargeable batteries to an
approved disposal centre, e. g. your local toxic waste
collection point or a retail outlet where batteries of the
same type are sold.
Polarity of receiver
battery connector
14 Operating notes
Operating notes
Adjusting stick length
Both sticks are infi nitely variable in length over a
broad range, enabling you to set them to the correct
length to suit your personal preference to provide fi ne,
accurate control of your models.
Loosen the retaining screw using a 2 mm allen key,
then screw the stick top in or out to shorten or extend
it. Carefully tighten the grubscrew again to lock the
set length.
Opening the transmitter case
Please read the following notes carefully before you
open the transmitter. If you are inexperienced in
such matters we recommend that you ask your local
GRAUPNER Service Centre to carry out these proce-
dures for you.
The transmitter should only be opened in the follo-
wing circumstances:
• In order to convert a non self-neutralising stick to
self-neutralising, or vice versa; see page 16;
• In order to adjust the stick centring tension;
• In order to replace the internal fuse (3 A, fast-blow);
• In order to install a “Trainer” system and data trans-
fer system; see page 15 and page 204 of the Ap-
pendix.
Before opening the transmitter it is essential to check
that it is switched off (move the Power switch towards
the screen). It is not necessary to remove the trans-
mitter battery, but if you do not remove it take care ne-
ver to switch the transmitter on while the case is open
(“ON” position). Please see page 12 for information
on removing the transmitter battery. The RF module
can also be left in place.
Use a cross-point screwdriver (size PH1) to undo the
six recessed screws
at the indicated
points in the rear
face of the trans-
mitter. Hold the two
case shells together
with your hand, turn
the transmitter over
and allow the six
screws to fall out.
The back cover can
now be carefully re-
moved.
Caution:
A loom of cables connects a circuit board in the
rear cover to the circuit board in the main case,
which means that the transmitter back cover can
only be folded down or to the side.
Important notes:
• Do not modify the transmitter circuit in any
way, as this invalidates your guarantee and also
invalidates offi cial approval for the system.
• On no account touch the circuit boards with
any metallic object, and do not touch the con-
tacts with your fi ngers.
• Never switch the transmitter on when the case
is open.
When closing the transmitter please note the fol-
lowing points:
• Insert the two side-mounted proportional controls
correctly in the cut-outs designed for them in the si-
des of the transmitter case;
• You will fi nd two rubber pads fi tted loose in the si-
des; ensure that they are located with the small slot
facing the back cover, and engage them in the ap-
propriate case cut-outs in the sides;
• Ensure that the wire loom connector between the
back cover and the circuit board is fi rmly inserted;
• Check that the V-shaped spring contacts (earth
contacts) in the centre of the transmitter are not
bent or deformed.
• Take care that no wires get caught when you close
the back.
• Ensure that the two case shells line up exactly
fl ush before you fi t the retaining screws. Never
force the case shells together.
Please refer to the illustration on the next page when
you carry out this procedure.
15
Padding
If the two pieces of padding fall out when you open the trans-
mitter, re-fi t them when closing the case, noting that the nar-
row slots face down in the case back, where they engage
over a small lug.
Operating notes
Side-mounted proportional controls
When re-assembling the transmitter check carefully that
the two side-mounted controls engage correctly in the cut-
outs designed for them in the top and bottom case shells.
On no account force the case shells together. All the other
switches are permanently installed.
Interface socket
14-pin socket for the optio-
nal Trainer / PC module, Or-
der No. 3290.22, which is
available as an accessory
(see Appendix).
Earth contact spring
This spring completes the
earth connection to the cir -
cuit board in the case back
cover. Take great care not to
bend or deform these contacts.
If the ends of the spring appear to be dirty,
clean them gently with a soft, dry cloth.
Cartridge fuse
(3A, fast-blow)
Transmitter installation bays
The Trainer / PC module available as an
optional accessory (Order No. 3290.22) is
installed in these two bays; see Appendix.
Directing the telescopic aerial
Before using the transmitter to control a
model, screw the ten-section aerial
fi rmly into its socket and extend it
to its full length. However, never
point the aerial directly towards the
model, as signal strength is low in
an imaginary line extending straight out
from the aerial tip.
Aerial socket
Make sure that the aerial is fi rmly screwed
into the socket before using the transmitter.
Never switch the transmitter on when the
case is open.
C A U T I O N: on no account touch any soldered joint with a metal object: SHORT-CIRCUIT HAZARD. Such action invalidates your guarantee.
Padding (see top right)
16 Operating notes
3. Attach the ratchet spring:
Attach the ratchet spring to
one end of the plastic pillar,
and set the desired spring
force by screwing the M3
screw in or out at the brass
stud.
4. If you wish to re-convert the
stick to self-neutralising action, fi rst remove the
ratchet spring and slightly loosen the centring
force adjustor screw: see right picture. Re-con-
nect the neutralising lever, and slip a length of thin
thread through the top loop of the spring (don’t tie
a knot). Now use a pair of tweezers to connect the
bottom loop of the spring to the adjustment sys-
tem (see close-up picture below). Finally connect
the top end of the spring to the neutralising lever
using the thread. Once the spring is in the correct
position, the thread can be withdrawn again.
The software also has to be “informed” of the change
in stick mode; this can be carried out separately for
each model in the »Base setup model« menu (pa-
ges 64 / 66). To set the stick mode for the transmitter
as a whole, i. e. so that it applies to all newly set-up
model memories, use the »General basic settings«
menu (page 154).
Stick centring force
The tension of the stick unit centring springs can be
adjusted to suit your personal preference: the adjust-
ment system is located adjacent to each centring
spring.
Rotate the adjustment screw with a cross-point screw-
driver to set your preferred spring force:
Turn to the right (clockwise) = spring force harder;
Turn to the left (anti-clockwise) = spring force softer.
Brass stud Plastic pillar
Changing the mode of the dual-axis proportional
stick units
Either stick can be converted from self-neutralising to
non self-neutralising (ratchet) action. First open the
transmitter as already described.
If you wish to switch the standard self-neutralising ac-
tion to non self-neutralising, use this procedure:
1. Locate the brass stud supplied in the set, and
screw it to the left or right stick unit as required
using a 4 mm box spanner (see double arrow in
the picture below).
2. Use a pair of tweezers to dis-
connect the spring from the
neutralising arm of the appro-
priate stick unit, raise the lever
and disconnect this too. Neutralising lever
and spring
Operating notes
Plastic
pillar
Brass stud
Ratchet
spring
17
Operating notes
Changing the frequency band and spot frequency
The mx-24s transmitter is fi tted as standard with a
PLL-SYNTHESIZER RF module. The spot frequen-
cy (channel) is selected using the rotary control, i. e.
plug-in crystals are no longer required at the transmit-
ter.
The Synthesizer module also features an integral
dual-conversion frequency scanner which is used to
check whether your preferred channel is already in
use or not; it can also be employed to determine the
vacant channels on your particular frequency band.
A detailed description of the method of using the
Synthesizer module and selecting spot frequencies
is found on pages 24 and 25 in the section entitled
“Using the transmitter for the fi rst time – frequency
scanner and channel selection”.
The set spot frequency is displayed on-screen. A se-
curity system prevents the transmitter radiating an
RF signal when initially switched on. The RF module
must fi rst be activated in the software, which provides
an additional gain in safety.
At present two separate transmitters are available: for
the 35 / 35B MHz band and the 40 / 41 MHz band:
Transmitters alone:
Order No. 4730.77 for the 35 / 35B* MHz band
Order No. 4748.77 for the 40 / 41* MHz band
* Channels 281 and 282 on the 35 MHz band, and all channels
on the 41 MHz band, are not approved for use in Germany; see
also the Frequency Table on page 206. The same table shows
which channels are approved for use with the various types of
model, i. e. model aircraft, model boats and RC cars.
The channels approved for use in individual countries
are shown in the Frequency Table on page 206 (infor-
mation not guaranteed).
The receiver must be operated on the same channel
and the same frequency band as the transmitter.
It is possible to use this transmitter to control any
GRAUPNER PLL Synthesizer receiver as well as ear-
lier crystal-controlled GRAUPNER receivers, provided
that they are compatible with the transmitter modes
PCM20, SPCM20, PPM18 or PPM24.
If you wish to use earlier crystal-controlled GRAUP-
NER receivers, it is essential to use genuine GRAUP-
NER FMsss plug-in crystals designed for the appro-
priate frequency band (see page 206). The receiver
crystal is marked “R” (Receiver), and should be inser-
ted fi rmly into the opening in the receiver.
Important note:
The RF Synthesizer module is connected to the mx-
24s transmitter by means of two sockets. If the RF
module is not plugged in correctly, the transmitter will
switch directly to the basic display when switched on.
The screen will then display the fl ashing message
“C––” instead of a channel number, indicating that the
RF module is not ready for use.
#01 0:00h SPCM20
10.9V
0:05h C--
0 0 0 0
Stop watch
Flight tim
000
000
:
:
Changing the frequency band
If you wish to switch from the 35 / 35B MHz band to
the 40 / 41 MHz band or vice versa, all you have to
do is replace the SYNTHESIZER RF module in the
transmitter:
Order No. 3853.35 for the 35 / 35B MHz band
Order No. 3853.40 for the 40 / 41 MHz band
18 Operating notes
DSC socket
Direct Servo Control
Model name
#01 0:30h SPCM20
H-J.Sandbrunner
10.2V
0:30h
0000
Stop watch
Flight tim
000
000
:
:
DSC
3. Connect the other end of the connecting lead to
the desired device, taking into account the opera-
ting instructions supplied with that equipment.
4. If you wish to use the Diagnosis lead, Order No.
4178.1, do not connect it directly to the receiver.
First connect the lead to a receiver battery using a
Y-lead (3936.11 or 3936.32), then connect this to
the receiver’s battery input socket instead of the
receiver battery. The end with the barrel plug can
then be connected to the appropriate socket on
the back of the transmitter.
Once the transmitter is connected to the recei-
ver as described above, you can check the con-
trol functions or make changes to settings even
if another pilot is using “your” frequency. Since in
this state (power = “OFF”) the transmitter does
not broadcast a radio signal, you can, for examp-
le, prepare your model ready to fl y without causing
interference to other modellers. Another advan-
tage is that the transmitter’s current drain is redu-
ced, since the transmitter’s RF section is not acti-
ve in this mode of operation. The use of Diagnosis
mode therefore extends the operating time of the
transmitter battery considerably.
Important:
Ensure that all the cables are fi rmly plugged in.
Note regarding fl ight simulators:
The range of fl ight simulators available commercial-
ly is now very wide, and you may fi nd that it is neces-
sary to swap over the contacts at the barrel plug or
the DSC module. This work must be carried out by a
The original function of this socket was for “Direct
Servo Control”, and that’s why the abbreviation is still
in use. However, it is now much more versatile than
simply providing a means of controlling servos by ca-
ble. The two-pole DSC socket of the mx-24s is now
also used as the Teacher or Pupil socket in a Trainer
system (see page 150), and as an interface for fl ight
simulators.
For the DSC connection to work you must check
the following:
1. Carry out any adjustments required in the approp-
riate menus:
If you are connecting the transmitter to a fl ight si-
mulator, or if you are using the mx-24s transmit-
ter as a Pupil transmitter in a Trainer system, then
you must set the transmission mode to “PPM18” in
the “Modulation” line of the »Base setup model«
menu. However, if you wish to connect a Diagnosis
lead (Order No. 4178.1), the “Modulation” must
be selected to suit the receiver.
2. Always leave the transmitter’s On / Off switch
in the “OFF” position in such cases, because
otherwise the RF section of the transmitter module
will not be switched off (no RF signal) even when
the DSC lead is plugged in. This is particularly im-
portant if you are using a Diagnosis lead or a Trai-
ner lead, because your transmitter may otherwise
cause interference to other pilots. Only when the
mx-24s transmitter is in Teacher mode should the
transmitter be switched on before the Trainer lead
is connected (see page 150).
Connect the appropriate two-pole lead to the
transmitter’s DSC socket. This action renders the
transmitter and the LCD screen ready for use, cir-
cumventing the channel select process. At the
same time the screen shows the message “DSC”
instead of the usual display of the selected trans-
mission channel.
GRAUPNER Service Centre.
Caution:
Certain receivers – such as the R16SCAN – fea-
ture a battery socket to which a servo can also be
connected via a Y-lead. It is not possible to use a
DSC lead with this type of receiver.
19
For your notes
20 Description of transmitter
Transmitter aerial
(ten-section
telescopic) Piezo buzzer
Proportional controls
Two proportional controls are mounted on the sides
of the transmitter as standard. A centre detent ensu-
res reproducible centre settings. In this case they are
described in the corresponding menus as : right-hand
control “CTRL 9”, left-hand control “CTRL 10”.
Operating buttons:
ENTER Input button
ESC Back button
CLEAR Erase button
HELP Help button
LCD screen (see page 22 for more details)
The thin protective fi lm over the screen surface can be peeled off using your fi ngers if you wish.
Contrast adjustment: from the basic display press the rotary control and rotate it at the same time; al-
ternatively press the rotary control and press the CONTROL 5 or 6 buttons, if these are not already in
use for other purposes.
Warning indicators : If battery voltage falls below the set threshold • if there is a Trainer system mal-
function • if Channel 1 is too close to full-throttle when the transmitter is switched on • if the Fail-Safe
settings are not correct • power-on warning (checking a switch position).
ON / OFF switch
Note:
Always switch the transmitter on fi rst, followed
by the receiver. After a fl ight: switch the recei-
ver off fi rst, followed by the transmitter.
Rotary control, providing two-level control
Description of transmitter
Front panel
Switches between individual lines within a menu when
held pressed in. When held pressed in turn the rotary
control at the top end of the cylinder for a better grip.
A brief press on the top end of the rotary control chan-
ges the input fi eld, or confi rms your input. Pressing the
HELP button with the rotary control held pressed in
switches directly to the »Servo display« menu from
the basic display and most menus.
If rotated in its normal (non-pressed) state, the rota-
ry control selects your chosen item from the list in the
multi-function menu. Once you have called up a menu
point, the rotary control also changes the entered va-
lue in a highlighted fi eld (light characters on dark back-
ground) which appears at the bottom edge of the
screen. Any alterations you make take effect immedia-
tely. When not pressed in, turn the rotary control at the
bottom end of the cylinder for a better grip.
Transmitter neckstrap lug
Digital trims
For fi ne adjustment of servo (travel neutral) position.
A brief push produces a single increment of offset
(the increment size is variable in the “Stick mode”
menu). The screen displays the trim positions.
Increment / Decrement buttons
Two proportional controls as standard: every time the
button is pressed, the travel of the associated ser-
vo changes by 1% relative to the pre-set servo travel.
INC = positive direction, DEC = negative direction.
These controls are numbered as follows: right-hand
button “CTRL 5”, left-hand button “CTRL 6”. These
two buttons can be used as an alternative to the rota-
ry control if they are not already in use for other pur-
poses.
Stick units
Two dual-axis stick units providing four independent
control functions. Variable-length sticks. The control
functions (i. e. stick mode) can be assigned within the
“Base setup model” menu, e. g. throttle left or right.
The throttle stick can also be set to be self-neutrali-
sing or ratchet action: see page 16.
Switches
Eight external switches as standard (SW = switch), of which
two-position: SW 1, 2, 3, 4, 7, 8 (switch 8: self-neutralising)
three-position: SW 5 + 6, 9 + 10. The three-position switches are
also used as transmitter controls to provide three-position servo tra-
vels. In this case they are described in the corresponding menus as :
right-hand switch “CTRL 7”, left-hand switch “CTRL 8”.
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