JR ProPo PCM9X User manual

MACGREGOR INDUSTRIES
Instruction Manual
PCM9X

2
JR PROPO
PCM9X
MacGregor Industries
Canal Estate, Langley, Slough, SL3 6EQ
Phone [phone] • Fax [phone]

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Table of Contents
CHAPTER 1 (SYSTEM)
Battery Charging 3
Charger 3
Control Stick Length 3
Control Stick Tension Adjustment 3
DSC Cord 4
Lithium Battery Indicator 4
Screen Contrast Adjustment 4
Installation Requirements 4
Setting Up Your PCM9X 5
System Menu 5
Model Select & Copy 6
Model Name 6
Type Select 6
Data Reset 6
Modulation 7
Data Transfer 7
Trim Step 8
Device Select 9
Wing Type 9
Swash Type Select 11
Stick Mode 11
CHAPTER 2 (HELI)
Dual Rates & Exponential 12
Reverse Switch 13
Sub Trim 13
Travel Adjust 14
Swash Mixing 14
Throttle Hold 14
Throttle Curve 15
Pitch Curve 16
Revolution Mixing 16
Gyro 17
Program Mixers 17
Failsafe 19
Trainer 20
Timer 21
Servo Monitor 21
Throttle Cut & Trim Select 21
CHAPTER 3 (AERO)
Dual Rates & Exponential 23
Reverse Switch 24
Sub Trim 24
Travel Adjust 24
Elevator To Flap Mix 25
Aileron To Rudder Mix 25
Throttle Curve 26
Snap Roll 26
Flap System 27
Gyro System 28
Aileron Differential 28
Servo Speed 28
Program Mixers 29
Failsafe 31
Trainer 32
Timer 33
Servo Monitor 34
Throttle Cut & Trim Select 34
CHAPTER 4 (GLIDER)
Dual Rates & Exponential 36
Reverse Switch 37
Sub Trim 37
Travel Adjust 37
Elevator To Flap Mix 38
Aileron To Flap Mix 38
Aileron Differential 38
Flap System 39
Flap To Aileron Mix 39
Aileron To Rudder Mix 39
Butterfly Mix 40
Program Mixers 40
Failsafe 41
Trainer 43
Timer 45
Servo Monitor 45

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All Models
he JR PCM9X is the latest JR transmitter and features the latest
technology. New to the PCM9X range is the scroll bar interface.
The scroll bar is used in conjunction with the side entry buttons to provide a quick
and efficient programming environment.
Rotating the scroll bar left or right will move the highlighted (selected) section of
the screen around available menu choices. Pressing the top of the scroll bar will
activated the highlighted menu item and where appropriate, produce a sub menu.
Within any sub menu, the highlighted menu item is similarly moved by rotating the
scroll bar and selected by pressing the top of the scroll bar. On the lowest sub
menu of any function, pressing the top of the scroll bar will toggle the choice
when there are only two (e.g. ACT/INH) or bring up an entry box where there are
more than two (e.g. when setting a travel adjustment figure). Within an entry box,
rotating the scroll bar will increment or decrement the figure displayed, or rotate
through the alternatives. Pressing the scroll bar completes the entry.
To avoid accidentally pressing the scroll bar during rotation, it is best to rotate the
bottom of the bar. When appropriate, block arrows on the screen point to any
active side input buttons.
To enter the main list of programmable functions of the transmitter please use the
list button. To enter the last edited program function press the enter button. The
clear button will return any currently edited value to default. The remaining button
is used for timer applications, if enabled.
The PCM-9Xfeatures digital trims on all controls and digital auxiliary trimmers at
the top of the set. Digital trims allow the transmitter to independently remember
trim positions for every model stored within the transmitter.
Chapter
1
T
Enter
List
Clear
Timer
Scroll
Bar

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3
Battery Charging
The transmitter and receiver battery packs should be charged for at least 16 hours
each evening before flying the next day. The first charge should last between 20
and 24 hours.
Please note: the polarity of the JR charger is negative centre. This may be
different to other manufacturers' chargers. You must make sure that the centre
pin of your JR transmitter is always connected to negative to ensure correct
polarity.
Charger
The charger supplied with your transmitter features two LED lights. These should
always be lit when a battery is connected. If they are not lit make sure both the Tx
and the Rx are turned off.
During charging the charger will rise in temperature. This is completely normal and
should not be a concern.
If you have any worries or concerns about any of the charging equipment please
seek expert advice.
Please ensure the correct charge rate for your battery pack. Any battery over
1000mah should receive a charger rate of 120ma.
Control Stick Length
The stick units of JR radio equipment feature adjustable stick lengths. Please use
the supplied allen key to make adjustments. Loosen the grub screw by turning the
allen key counter clockwise. Then adjust the stick length to your required length.
Lock the stick in place by turning the grub screw clockwise.
Optional coloured sticks are available from your JR/MacGregor dealer, as well as
long or short sticks.
Control Stick Tension Adjustment
Remove the RF module, NiCad battery and the back cover screws. Remove the
transmitter back, being careful not to bend or damage the RF pins. The tension
screws protrude from the back of the stick assemblies, immediately adjacent to the
tension springs. Adjust each screw for the desired tension (anti-clockwise to loosen
the stick feel, clockwise to tighten the feel).

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DSC Cord
Direct Servo Connection (DSC) allows you to control the servos of the model
without having to transmit any RF from the transmitter. The lead bypasses the
module of the transmitter and allows safe operation of your radio equipment
without interfering with any other pilots’ transmitted signals.
To use the DSC connection make sure all equipment is turned off. Plug the DSC
cable into the transmitter and then into the receiver’s charge lead. Then turn the
receiver to ON. You do not need to turn the transmitter on as the DSC lead will
automatically power up the transmitter. Turning on the transmitter will result in
your set transmitting RF and possibly interfering with other modellers.
Note: The DSC function will only operate with a JRC498D Deluxe Switch
Harness, or the JRC498 Heavy Duty Switch. These switches include the
orange signal wire, as well as the brown and red power wires.
Lithium Battery Indicator
All pre-programmed data is protected by a five-year lithium battery backup.
If the voltage level of the lithium battery drops below an acceptable level (2.2v)
a low lithium indicator will appear. This indicates that the lithium battery will
no longer maintain program memory. When the lithium indicator appears on
the screen, the system should be sent to the JR/MacGregor Service
Department for a lithium battery replacement.
Should the lithium battery fail, the display will indicate BACK UP ERROR. If
this occurs, it will be necessary to replace the battery and reprogram all data.
All transmitter programs will return to the factory default setting, and the data
you have input will be lost.
Screen Contrast Adjustment
The screen contrast adjustment feature of the PCM9X allows the user to select
the proper tint of the screen for improved clarity and visibility in all weather
conditions and temperatures.
To change the contrast turn the power switch ON and use the scroll button to
highlight the DISP CONT icon on the far right of the display. Press the scroll
button and a box will appear around the icon. To increase the contrast (darken
the screen), rotate the scroll button to the right. To decrease the contrast
(lighten the screen) rotate the scroll button to the left. Press the scroll button
again to retain your new setting.
Installation Requirements
It is extremely important that your radio system be correctly installed in your
model. Here are a few suggestions on the installation of your JR equipment.

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1. Wrap the receiver in protective foam rubber that is no less than 10mm
thick. Secure the foam to the receiver with rubber bands. This protects the
receiver in the event of a crash or a very hard landing.
2. The servos should be mounted using the rubber grommets and brass
bushings supplied to isolate them from vibration. Do not over-tighten the
mounting screws — this will negate the vibration absorption effect of the
rubber grommets. The brass bushings are pushed from the bottom up in the
rubber grommets. When the servo screw is tightened securely, it provides the
proper security, as well as the proper vibration isolation for your servo.
3. The servos must be able to move freely over their entire range of travel.
Make sure that the control linkages do not bind or impede the movement of
any of the servos.
4. Mount all switches away from the engine exhaust and away from any high
vibration areas. Make sure each switch operates freely and is able to operate
over its full travel.
5. Mount the receiver antenna firmly to the aeroplane to ensure that it will not
become entangled in the propeller or control surfaces.
Setting up your PCM9X
JR radio control systems include two main menus to program a model. The
System menu is normally only accessed when first setting up a model and allows
you to set basic parameters such as model type, modulation, stick mode etc. The
Function menu allows you to alter parameters dependant upon model type
(aeroplane, helicopter or glider) and allows quick access to set up, trimming and
mixing facilities such as travel adjust, servo reversing and dual rates - and much,
much more!
System Menu
To enter the System menu press and hold the enter key whilst simultaneously
turning on the transmitter. From here you can choose the following functions:
Information Display Returns you to the main display screen
Model Select Select or copy from one of 20 model memories
Model Name Type in your model’s name – 8 characters
Type Select Aeroplane, Helicopter or Glider
Model Reset Resets selected model memory to factory settings
Modulation SPCM (1024), ZPCM (512) or PPM
Transfer Transfer data to another PCM9X Tx.
Trim Step Fine tune the sensitivity of the digital trims
Device Select New! Assign switches to suit personal preference
Wing Type – (Aero/Glider) Normal, Flaperon, Delta(*) and/or V-Tail
Swashplate Type – (Heli) Normal or 180o , 120o, 90o
Stick Mode Select stick mode 1, 2, 3 or 4.
* Aero only

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Model Select & Copy
The PCM9X transmitter employs a memory function, which memorises data
for up to 20 individual aircraft. To avoid using incorrect model memories, it is
recommended that you enter a unique name for each aircraft. Press the ENT
key and turn the power switch ON to access the System Set-Up Mode.
The Copy Function enables you to copy all of the settings of your current
model to another memory (model number) within the same transmitter. This is
very useful when setting up one aircraft several different ways.
Model Name
This function is used to input model names individually. Each model’s name is
displayed in the normal screen automatically when that model is selected. To
avoid confusing models, inputting model names is recommended. You can
input a maximum of 8 characters for each model name. In the System Set-Up
Mode, select the Model Name Function using the scroll bar. Once selected,
press the scroll bar to access.
Type Select
The PCM9X is capable of performing as a helicopter, airplane or glider radio
with full functions for each. It can also memorize data for 20 models
individually.
Note: If the power switch is turned OFF immediately after selecting the new model type, the
change will not be saved.
To change and save the model type use the scroll bat to select the GLID,
ACRO or HELI. Press the scroll bar. At this time, existing model data is
replaced by the model type aircraft data selected. Be sure to confirm the model
name to prevent accidental loss of your important data. To cancel this
function, return to former model type or turn the power switch OFF.
Note: When you an alternative model type on this transmitter the allocation of lever
switches, etc., will also change. Please refer to the appropriate section of this instruction
manual for their functions.
In the System Set-Up Mode, select the Type Select Function using the scroll
bar. Once selected, press the scroll bar to access.
Data Reset
The Data Reset Function allows you to reset all the functions and settings for
the current model to the factory pre-set conditions. Resetting does not affect
the data already programmed for other models. Be sure to confirm that you
need to reset the data of the currently indicated model in order to prevent
accidental loss of valuable data.
To access Data Reset, select Model Reset in System Set-Up and press the scroll
bar.

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Modulation
The Modulation Selection Function enables your PCM9X to transmit to all JR
receiver types. You can select from either S-PCM or Z-PCM mode, depending
on the Central Processing Unit within your receiver, or from PPM (Pulse
Position Modulation—FM).
Caution: After making modulation changes, you must press the scroll bar to accept the new
modulation type. If the Tx power switch is turned OFF before this procedure, the modulation
change will not be saved.
Data Transfer
This function is used to transfer all existing memorised data for a model from
one PCM9X transmitter to another PCM9X transmitter. Use the scroll bar to
select the model to be transferred and activate by pressing the CLR key. To
avoid the loss of important data, re-confirm model names when transferring.
Caution: Please use special caution when copy function is activated as existing data is
replaced with new data.
Caution: When the battery alarm is activated (battery low), the copy function is not
operational.
Transfer Procedure
1. Select the model number to be transferred (transmitting mode side) through
the model select function.
2. Both transmitters: With the power switches OFF, press and hold the ENT
button while inserting the trainer cord into the DSC jack of the transmitter.
3. Both transmitters: Select the Transfer Function by rotating the scroll bar,
then press the scroll bar to enter the Transfer Function.
4. Receiving mode transmitter (Tx to be programmed): Rotate the scroll bar to
highlight the "Transmit" icon. Press the bar and the icon will change to
"Receive". Rotate the scroll bar to highlight the Model Number icon. Press the
bar and the icon will change to a box showing the available model numbers.
Select the receiving model number by rotating and pressing the scroll bar.
Next, press the CLR key to activate the receiving stand-by mode.

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5. Transmitting mode transmitter (Tx with program to be transferred): Check
that the Transfer screen shows Transmit mode and press the CLR key to start
transmitting data. Both transmitters will indicate "End ok!" when the transfer
is complete.
When there is a data receiving failure during transfer, the counter will stop. At
this time, press the CLR key to stop the receiving condition. Check to be sure
the receiving counter is operating normally and ended with 100%. When the
receiving counter is stopped or you see ERROR indicated, check the trainer
cord conditions and try again. Be sure that the receiving mode transmitter is in
stand-by condition first. Also ensure that when transferring is complete,
previous data stored in the receiving side transmitter is replaced by the new
data transferred. Note: This function does not work when the battery alarm is flashing
(low battery).
Trim Step
The trim step function changes the coarseness of the digital trims from between 1
step per position to 10 steps per position.

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Device Select
A new feature of the PCM-9X is the device select menu. From here you can
assign functions to a switch to allow you to tailor the layout of your transmitter
to your own personal taste.
The device select menu also allows you to activate the extra flight modes.
Use the scroll button to highlight a function (top line) and then depress the button
to bring up the assign menu where you can then select the desired switch to assign
the function to.
The bottom line shows other functions for the various switches. The default shows
that the switch is active (ACT) in its usual function. If the cursor is placed over the
ACT symbol and the scroll bar is pressed then a menu of other options is displayed
such as GYRO (for switching gyro gain) and SYS. (for selecting the Flap System).
When using an aero model memory, to allow you to use features such as dual
aileron, rudder, elevator, flap and engine you need to inhibit (INH) an auxiliary
channel within the device select menu to allow it to be available in the wing type
menu. Once available in the wing type menu it can be assigned as the mate (slave)
of the master channel.
Wing Type (Aero & Glider)
The purpose of Wing Mixing or Wing Type Function is to eliminate
mechanical or programmable mixes that would otherwise be necessary for the
proper flight of certain styles of aircraft. Flaperon, elevon (delta) and V tail
configurations are available in aero mode and flaperon (Dual Flap) and V tail
are available in glider mode. Each of the wing type selections will be covered
in a separate section.
Normal Wing Type Selection
This is the first wing type selection that appears on your LCD display. Use this
wing type with common aircraft that utilize only one servo for both ailerons.
Flaperon Wing Type Selection
Flaperon allows you to use the existing ailerons as flaps. The ailerons can be
raised or lowered in unison as flaps, yet still remain fully operational as the
ailerons of your R/C aircraft.

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Flaperon Connections: Connect the left aileron to AUX1 Rx port and right
aileron to AILE servo Rx port. In System Set-Up Mode, select the Wing Type
function. Then press the scroll bar to display the Wing Types. Rotate and press
the scroll bar to access the flaperon wing type selection. Note that each servo’s
operational value is automatically set for 75%. The applicable channels’ travel
adjustment is used to adjust the individual servo throw; while the combined
aileron travel is adjusted with the aileron dual rate. It is also possible to set
Aileron differential. Reverse switches are applicable for each servo. The Sub-
Trim Function makes neutral adjustments of each servo.
Note: Flaperon set-up is the recommended way to achieve aileron control when using 2
separate servos.
Elevon Wing Type Selection
Elevon, or delta as it is commonly known, is the final wing mixing selection in
your PCM9X. This style of aircraft also employs two wing servos. Rotate and
press the scroll bar to access the Delta (Elevon) type wing selection. The wing
servos move in the same direction for elevator control and in opposite
directions for aileron control.
Elevon Connections: Link the left moving control surface to the AILE servo
port and the right moving control surface to the ELEV servo port. Each
servo’s operational value is set automatically at 75%. The applicable channels’
servo travel is adjustable by using the travel adjust. Aileron and elevator travels
are adjusted using aileron and elevator dual rates. It is also possible to set
aileron differential. If necessary, use the servo reversing to set the aileron travel
direction and the elevator travel direction will automatically be correct.
V-Tail
When using V-Tail mix, connect the left moveable tail surface servo to the
receiver channel three (ELEV) and the right moveable tail surface servo to the
receiver channel four (RUDD). Note that the servo travel is automatically
reduced to 75% when the mix is active. Individual servo adjustments, servo
reversing, sub-trims etc. may be made for individual servos but the rudder
travel should be adjusted using the dual rate function (both servos are adjusted
together). If an individual servo travel is altered, only that servo will be
affected. Use the elevator dual rate function to adjust the elevator travel.
Dual Controls
The PCM9x has built in facilities for dual controls and twin engines. To allow
a mate (slave) channel to be assigned to your dual control first inhibit the
desired mate (slave) channel in the device select menu. Once this channel is
free it can be selected as a mate (slave) in the wing type menu. You can also
choose whether to have the trim enabled or inhibited. Enabling the trim
function allows the trim to control not only the master dual control but also its
mate (slave).

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Swash Type Select (Heli)
The PCM9X provides four types of Cyclic Collective Pitch Mixing (CCPM)
mixing. Either normal mechanically mixed CCPM (mCCPM) or three types of
electronically mixed CCPM (eCCPM). The three versions of eCCPM pre
programmed in the software are 90 degree 4 servo, 120 degree 3 servo or 180
degree 2 servo.
Stick Mode
This function enables the stick mode to be changed between Mode 1, 2, 3 or 4.

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Function Menu - Helicopter
To enter the function menu, switch on the transmitter then press the enter
key. From here you can choose the following functions:
Dual Rates & Exponential
Dual rates can be defined as the ability to vary the travel or throw rate of a
servo from a switch. Due to differing travel rates, you will find that the
sensitivity of the control either increases or decreases accordingly. A higher
rate, or travel, yields a higher overall sensitivity. You may find it easier to think
of the Dual Rate Function as double-rated or half-rates.
The Dual Rate Function works in conjunction with the Exponential Function
to allow you to precisely tailor your control throws. In Function Mode, use the
scroll bar to select Dual Rate and access by pressing the scroll bar.
Dual rates are available for the aileron, elevator and rudder channels of your
R/C helicopter. The amount of travel is adjustable from 0-125%; exponential
is adjustable from 0% (LIN) to 100% in 1% increments. The factory setting, or
default value, for both the 0 and 1 switch positions is 100%. Either switch
position may be selected as the low or high rate by placing the switch in the
desired position and adjusting the value accordingly. There is also an automatic
dual rate setting for all three channels, operable from the Flight Mode Switch.
You may also assign a dual rate setting to a flight mode. The PCM9X provides the
user with 3 possible dual rate & exponential settings. These settings may then be
assigned to a flight mode using the automatic switching function.
When the Automatic Dual Rate (ADR) function is activated (ACT), when
switching the Flight Mode switch to Stunt 1 and Stunt 2 the Aileron, Elevator,
Chapter
2

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and Rudder channel dual rate values will be switched between the settings
available on screen for those flight modes. To activate ADR please enable the
flight mode switch in the device select menu, and then set the D/R function
to FM (Flight Mode).
Typical dual rate settings are as follows:
Dual Rate Switch Position
0 Position (reduced servo travel, for hovering e.g. 80% D/R, 20% EXP)
1 Position (maximum servo travel, for aerobatics e.g. 100% D/R, 10% EXP)
Reverse Switch
The PCM9X features a servo reverse function. This allows the user to electronically
reverse the direction of a channel. Servo reversing is available for all 9 channels of
the PCM9X. In Function Mode, use the scroll bar to select Reverse Switch and
enter by pressing the scroll bar.
Sub Trim
The sub trim function allows you to individually fine tune the centring of all 9
channels on the PCM9X within a range of + or - 125% (+ or - 30 degrees
servo travel). It is not a good idea to use excessive sub trim as you can
eventually overrun the maximum travel of your servos.
In Function Mode, use the scroll bar to select Sub Trim and access by pressing
the scroll bar.

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Travel Adjust
The purpose of Travel Adjust, also known as endpoint adjustment or
adjustable travel volume, is to offer you precise servo control deflection in
either direction of servo operation.
The travel adjust range is from 0-150% (0 degrees to 60 degrees) and it can be
adjusted for each direction individually. The factory default (data reset) value is
100% for each direction of servo travel.
In Function Mode, use the scroll bar to select Travel Adjust and access by
pressing the scroll bar.
Swash Mixing
If an eCCPM mix has been selected, you can fine-tune the swashplate mixing using
Swash Mix in the Function List.
When in an eCCPM set-up the software allows you to adjust the overall travel for
each primary control. The exponential function is used to help reduce interaction
produced by the use of eCCPM. It reduces servo throw around centre stick
movement and becomes more linear towards the extremes of stick movement.
In Function Mode, use the scroll bar to select Swash Mix and access by
pressing the scroll bar.
Throttle Hold
The Throttle Hold Function holds the throttle servo in a specific position
when the switch is activated. This is very useful for practicing autorotation
landings. The throttle hold switch is located on the top left corner of the
transmitter. The throttle hold function is ON in the forward switch position;
in the rear position, the throttle hold function is OFF.

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The factory setting for the throttle hold is inhibited. Adjust the throttle hold
value to deliver the proper engine RPM for your helicopter. The adjustable
range is -20 through +50%. To shut the engine off during an autorotation, a
negative value may have to be input.
In Function Mode, use the scroll bar to select Throttle Hold and access by
pressing the scroll bar. Rotate the bar to highlight the INH icon and press the
bar to activate Throttle Hold. Highlight the HOLD Pos. icon and press the
bar. The Hold Pos. icon and value will now appear in a box and the value can
be adjusted by rotating the scroll bar.
Throttle Curve
The PCM9X offers up to five (5) separate throttle curves with seven (7)
adjustable points per curve. Three curves are available from the default setting,
with an extra two curves available if the Flight Mode Extra function is enabled
in the Device Select menu. This function allows you to customize the throttle
curve and pitch curve together to maximize engine performance at a particular
pitch setting.
Once the throttle curves are established, each can be activated in flight
using the three (3) position flight mode switch plus the two (2) additional
positions provided by the nominated extra flight mode switch in the system
menu. The flight switch offers five (5) selectable curves. N=Normal, 1=Stunt
1, 2=Stunt 2, 3=Stunt 3 and 4=Stunt 4. The N, or Normal, position should be
used for hovering. Positions 1, 2, 3, 4 or Stunt 1, Stunt 2, Stunt 3 and Stunt 4
should be used for aerobatic manoeuvres and forward flight. Note: The throttle
trim and hovering throttle knobs are only operable when the flight mode switch is in the
Normal position. Thus, in the 1/2/3/4 positions, these two functions have no
effect. Each of the seven (7) positions of the throttle curve are independently
adjustable from 0 -100%. These seven (7) positions correspond to the position
of the throttle stick. The transmitter is factory preset to the throttle curve as
indicated by the solid line in the figure above. Individual middle points can
be activated and increased/decreased to suit your specific needs.
Exponential Throttle Curve Function
With the PCM9X system, individual throttle curves are selectable to be either
straight (linear) or curved (exponential). To select an exponential curve, use the
scroll bar to select and activate the exponential feature (an “on” will replace
the “off” on the screen). With the exponential function ON, you will notice
that any “sharp” angles of the throttle curve will become more “rounded” or

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“smooth,” creating a more equal throttle servo movement during the entire
throttle curve range.
Pitch Curve
Adjustment of the pitch curve is very similar to the throttle curve adjustment
described in the preceding section. A thorough understanding of the throttle
curve section will make pitch curve adjustment easier to understand. The
PCM9X offers six (6) independent types of pitch curves: Normal, Stunt 1,
Stunt 2, Stunt 3, Stunt 4 and Hold. Each pitch curve contains seven (7)
adjustable points — L, 1, 2, 3, 4,5 and H. Note: When setting pitch curve for
throttle hold, it is necessary for the throttle hold to be active — if this function
is inhibited, the throttle hold pitch curve will not be visible on the screen.
Revolution Mixing
The Revolution Mixing Function mixes tail rotor input with the Throttle /
Collective Function to counteract torque from the main rotor blades. When
set-up correctly, the helicopter should climb and descend without a tendency
to yaw in either direction. Because torque reaction varies with different power
settings, it is necessary to vary the tail rotor pitch at the same time. The
PCM9X offers two (2) separate revolution-mixing programs with independent
up and down mixing for each — one for flight mode position N and the other
for Stunt 1, 2, 3 and Stunt 4 positions. The U, or Up, mixing adjusts the tail
rotor compensation for the mid to high throttle/stick setting, and the D, or
Down, mixing adjusts the tail rotor compensation for the mid to low throttle
stick setting. Note: This function should not be used with a gyro in heading hold mode.
Setting Up Revolution Mixing
First, adjust the helicopter so that it will hover in a neutral position with the
tail rotor trim at centre. Next, establish the helicopter into a stable hover; then
steadily increase the throttle to initiate a stable climb. The body of the
helicopter will move in the opposite direction to the main rotor rotation.
Increase the U, or Up, setting until the helicopter will climb with no tendency
to turn or rotate. At a safe altitude, close the throttle and the helicopter will
descend with the body turning in the same direction as the main rotor.
Increase the D, or Down, mix until the helicopter descends with no tendency
to turn or rotate. When attempting this procedure, throttle stick movements
should be slow, and the initial acceleration and deceleration swings should be
overlooked.

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Gyro Sensitivity
The gyro sense software of the PCM9X allows the pilot to change the gyro gain
remotely from the transmitter. The gyro can be controlled manually from the
rudder dual rate switch or automatically with the flight mode switch. The rudder
dual rate switch allows two gains to be chosen, while the auto function allows you
to select three gains. The gain lead from the gyro should be connected to the
AUX2 channel of the receiver.
When in automatic mode you can choose which gain should be active on which
flight mode as shown below.
Program Mix
The PCM9X offers three (3) programmable mixes to be used for a number of
different purposes. The functions allows mixing any one channel to any other
channel. The mix can remain ON at all times, or be switched OFF in
flight using a number of different switches. Each channel is identified by a
four character name (i.e., Aileron - AILE, Elevator - ELEV, etc.). The channel
appearing first is known as the “master channel”. The second channel is
known as the “slave channel”. For example, AILE - RUDD would indicate
aileron to rudder mixing — each time the aileron stick is moved, the aileron
will deflect, and the rudder will automatically move in the direction and to the
value input. Mixing is proportional, so small inputs of the master channel will
produce small outputs of the slave channel.
Multi-Point Programmable Mixing (Mixers 1 and 2)
Programmable mixes 1 and 2 have the capability for multi-point
programmable mixing. The graphic mixing curve, located on the right side of
your screen, indicates the mixing curve selected and is a useful reference tool
when adjusting or storing points. Up to 7 points can be stored, and these

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points can be moved independently to any desired servo position from 0 to
100%.
Assigning Channels
Using the scroll bar, move the cursor to the master channel. Press scroll bar
down to activate selection. Roll the scroll bar to select the desired channel.
Operating with a Switch
Using the scroll bar, position the cursor on the SW SELECT function and
Press to select the desired switch for the particular program mix being used.
Assigning Mixing Values
Position the cursor on the desired “Point” and press. Increase or decrease the
mixing value using rolling action of the scroll bar or the CLR key. To activate
points 1,2,4 or 5 with “INH” displayed, press the scroll bar at that position to
display mixing value. Press the CLR key if you want to inhibit mixing.
Exponential Function
An exponential function allows you to "smooth" the selected curve. With the
cursor at the “point” position, use the scroll bar to select the EXP function
and press to activate exponential.
Standard Programmable Mixing (Mixer 3)
Determine the master and slave channels required for mixing. Using the scroll
bar, select PROG.Mix3. Using the scroll bar, position the cursor on to the
channels being mixed. Press the scroll bar down to select the desired channels
for mixing. To establish the mixing value, move and hold the master channel
control (up, down, left, or right) and set the slave servo mix value by pressing
and then rotating the scroll bar.
Establishing Offset (Mixer 3)
The purpose of the mixing offset is to redefine the neutral position of the
slave channel. Any desired position may be set for the offset reference point.
Select offset using the scroll bar, press down, then rotate the scroll bar to give
the required figure. The offset value (offset value from servo travel centre) is
now determined; however, the reference point mixing value is zero.