JR JR DSM 12x Operating instructions

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APPLICATIONS AND
PROGRAMMING GUIDE
12-CHANNEL COMPUTER RADIO
SYSTEM WITH SPEKTRUM 2.4GHz DSM
TECHNOLOGY

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Programming a model for the first time, especially with a new
radio, can be confusing. Following are programming guides
that give step-by-step instructions for programming a giant-
scale aerobatic airplane, an aircraft with dual flap setup, a
Helicopter with CCPM mixing and a full function sailplane.
Within each section, information is provided to program
various flap options, heading lock and conventional gain gyros,
programming a governor and programming a countdown timer
to start on throttle up. While there are an endless number of
programming methods and options, the following setup guide
provides the fundamental basis from which to build upon.
Important: This Applications Guide is intended to be used
as a supplement to the manual. For further details regarding
programming specifics please refer to the manual.
Following is a step-by-step programming guide for Giant-Scale
aerobatic aircraft. The specific example below gives setup
details for an aircraft with 4 aileron servos, 2 elevator servos,
and 2 rudder servos. Included is information on programming
a countdown timer to be activated upon throttle up. While this
setup guide is specific to Giant-Scale aircraft, setup of other
types will be similar.
Use the following to locate the correct locations for
the servos:
Programmable Smoke System- Channel 10/ Aux5
Rudder Servo 2- Channel 9/ Aux4
Left Aileron Servo 2- Channel 8/ Aux3
Right Aileron Servo 2- Channel 7/ Aux2
Left Elevator Servo- Channel 6/ Aux1
Left Aileron Servo 1- Gear CH5
Rudder Servo 1- Rudder CH4
Right Elevator Servo- Elevator CH3
Right Aileron Servo 1- Aileron CH2
Throttle Servo- Throttle CH1
Introduction
Giant-Scale Aerobatic Aircraft Setup Guide
Servo Connections

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1. Press and hold the ENT button while turning on the power
switch to enter the System Mode List screen.
2. Using the roller, highlight 84. Model SEL and press the
roller to access the Model Select screen.
3. Rotate the roller to highlight MODEL then press the roller.
The following screen will appear.
4. Rotate the roller to highlight the desired model memory
(1 thru 50) then press the roller to select the highlighted
model memory.
Note: It is recommended that an unused model memory
be selected.
Step 1. Selecting a Model Memory

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1. In System Mode List screen use the roller to highlight 89. Type
SEL. and press the roller to access the Type Select screen.
2. Rotate the roller to highlight ACRO then press the roller to
enter the ACRO program.
1. In System Mode List screen use the roller to highlight 28. MDL
Reset and press the roller to access the Model Reset screen.
2. Press the RESET button, then press YES to reset the model
memory to Factory Default settings.
Note: All programming in the selected model memory will
be reset to factory defaults.
Note: All programming in the selected model memory will
be reset to factory defaults.
Step 2. Selecting the Model Type (Acro)
Step 3. Resetting the Model Memory

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1. In System Mode List screen use the roller highlight 81.
MDL Name and press the roller to access the Model Name
screen.
2. Rotate the roller to select the desired position to place a
letter or number (up to 16 characters) and press the roller
to access the Character screen.
3. Rotate the roller to select the desired number or letter and
press the roller to transfer that character to the selected
position.
4. Repeat until naming is complete. Press LIST to return to the
System mode list.
Step 4. Naming the Model

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The Trim System Code 83 allows the adjustment of the trim
authority and also allows the flap trim and aux trim levers to
be turned on or off. An LST function when turned on causes
the aileron, elevator and rudder trim levers to only affect the
center and not affect the endpoints, which is desired for aircraft
to prevent over-driving the servos when trim is used. For most
40% aerobatic aircraft it is recommended to turn the flap trim
and aux trim off. The remaining settings are recommended
to be left at the default settings, 100% throttle, 4 for Aileron,
Elevator, and Rudder, and leave LST turned on. Once the aircraft
is trimmed using the default settings, the trim rate for Aileron,
Elevator, and Rudder can be reduced to 1 to allow for fine
adjustments of trim to perfectly trim the aircraft in flight.
Note: If a large amount of trim is required for the model,
LST trims will reduce the amount of throw in the direction
of the trim, and reduce control effectiveness in that
direction.
1. In System Mode List screen use the roller to highlight 83.
Trim SYS and press the roller to access the Trim System
screen.
2. Highlight ON next to Flap Trim and press the roller to
change this to OFF.
3. Highlight ON next to Aux Trim and press the roller to
change this to OFF. All other settings in Trim System should
be left in their factory default values.
Trim System
Step 5. Setting Up the Trim System

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The flight mode name function code 92 can be used to rename
the flight modes throughout the system. This allows customized
programming for at-a-glance awareness of the current flight
mode. For instance Flight Mode 0 can be renamed 3-D, Flight
Mode 1 can be renamed SNAP, and Flight Mode 2 can be
renamed NORMAL (NORM). A short name can then be selected
from the complete flight mode name. Throughout the system,
the short name will be used as the name of the flight mode in
functions such as program mixes and other functions.
1. In System Mode List screen use the roller to highlight 92.
FM Name and press the roller to access the FM Name
screen.
2. Rotate the roller and highlight the first character, press the
roller, then rotate the roller to select the desired character.
Press the roller to select the desired character, and repeat
for each flight mode as desired. The Flight Mode name can
be up to 6 characters long.
Flight Mode Naming
Step 6. Flight Mode Naming

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3. Rotate the roller and highlight the * and – marks as desired
under each Flight Mode name to select the abbreviated
short name. A * mark indicates the character will be used
in the short name, a – mark indicates the character will not
be used in the short name. The short name can be up to 4
characters long.

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Device Select code 17 allows the activation of flight modes,
selecting a throttle hold switch, flap trim selection, flight mode
trim selection, and switch selection and activation for all aux
channels. Generally it is recommended for most aircraft to
begin setting up the aircraft by inhibiting all aux channels in
Device Select so that they can be used for dual functions in
the Wing Type menu. Flight modes can be activated in Device
Select; many flyers prefer to use the elevator dual rate switch
as the flight mode switch, though there are several switch
options that can be selected. Extra Flight modes (5 instead of
3) can be activated as well in the Device Select function, using
2 switches combined to select the desired flight mode in flight.
Generally most fliers use 3 flight modes. Flight mode trims
can be activated in Device Select. With Flight mode trims on,
trims will be independent for all flight modes, which allows the
aircraft to be trimmed in each flight mode. If the aircraft requires
different trim settings in each flight mode, activate this function.
Generally most giant-scale aerobatic aircraft do not require
different trim settings for each flight mode, so this is generally
turned off.
Note: If flight mode trims are active, it will be necessary to
trim the aircraft in all flight modes independently.
1. Press and hold the ENT button while turning on the power
switch to enter the System Mode List screen.
2. Using the roller highlight 17. DeviceSEL and press the
roller to access the Device Select screen.
Device Select
Step 7. Device Select Setup

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3. Rotate the roller to highlight INH next to Flight Mode then
press the roller. The available switch positions screen will
appear.
4. Rotate the roller to select the Elevator D/R switch then press
the roller to select it. If another switch is desired, choose it
in the same manor.
5. Rotate the roller to highlight ACT next to Gear then press
the roller. The available functions list will appear.
6. Rotate the roller to select INH. Repeat for all the remaining
Aux channels.

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Twin Engine. In this example, we will select 4 servo aileron and
mate the flap channel Aux1 to elevator for a dual elevator setup,
and mate channel 9 Aux4 to rudder for dual rudder servo setup.
The channels used for the mate function can be selected to be
any open auxiliary channel.
The Wing Type menu is used to select the wing type of the
model : Normal for single aileron servo, Flaperon for dual
aileron servo, Delta type for delta wing or elevon models, and
4-AILE for 4 aileron servos. Also V-Tail is selectable, as well
as Dual Mate functions for Aileron, Elevator, Rudder, Flap, and
1. Press and hold the ENT button while turning on the power
switch to enter the System Mode List screen.
2. Using the roller highlight 22. Wing Type and press the
roller to access the Wing Type screen.
3. Rotate the roller to highlight Normal next to Wing then
press the roller. The available wing options list will appear.
Wing Type
Step 8. Wing Type Setup

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5. Rotate the roller and highlight INH under ELEV and press
the roller.
4. Rotate the roller and highlight 4-Aile and press the roller.
6. Rotate the roller and highlight FLAP and press the roller.
7. Rotate the roller and highlight INH under RUDD and press
the roller.
8. Rotate the roller and highlight AUX4 and press the roller.

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1. With the system installed in the aircraft, insert the bind plug
in the bind receptacle.
2. Turn on the receiver switch. Note that the LED’s on all
receivers should be flashing, indicating that the receiver is
ready to bind.
3. Establish the desired fail-safe stick positions: normally low
throttle and aileron, elevator and rudder at neutral.
4. Press and hold the bind button on the back of the
transmitter while turning on the power switch. Within a
few seconds the system should connect. The LED’s on
the receivers should go solid, indicating the system has
connected.
5. Remove the bind plug and store it in a convenient place.
6. After you’ve programmed your model, it’s important to
rebind the system so the true low throttle and neutral
control surface positions are programmed.
1. In the Function List screen use the roller to highlight 11.
REV. SW and press the roller to access the Reverse switch
screen.
2. Rotate the roller to highlight the desired channel that you
wish to reverse and press the roller to reverse that channel.
Repeat this for all channels.
Step 9. Binding
Step 10. Servo Reversing

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1. In the Function List screen use the roller to highlight 12.
TRVL adjust and press the roller to access the Travel adjust
screen.
2. Rotate the roller to highlight the desired channel that
you wish to adjust the travel adjust and press the roller
to access that channel. Move the corresponding stick or
switch in the desired direction to highlight the value for that
direction, then rotate the roller to adjust the travel adjust
value for that direction.
Note: For most aircraft, the best mechanical advantage
is to set the travel adjust to 125% or higher and adjust
the mechanical setup on the aircraft to achieve the proper
throw. To increase travel mechanically, either move out
on the servo arm or in on the control horn; to decrease
travel mechanically move in on the servo arm or out on
the control horn. Keep in mind that moving out on the
servo arm or moving in on the control horn reduces the
mechanical advantage of the surface, and an improper
mechanical setup can lead to flutter.
Most giant-scale aircraft pilots use different dual rates and
expo for each flight mode to customize the aircraft feel and
performance in each flight mode. For instance in 3-D Flight
mode, generally the Dual rate is set to 100% or higher, and
the Expo is generally set to 50% or higher to soften the feel
of the aircraft at center, which makes the aircraft fly normally
around center, but then allows for 3D control rates at full stick
deflection. Alternately, for SNAP mode, generally the rates
are set low for elevator and rudder, and higher for aileron
to improve snap roll performance, with moderate expo on
aileron and lower expo on elevator and rudder. In normal flight
mode, generally the rates and expo are set to comfortably fly a
sequence or basic aerobatics smoothly with low rates and low
expo values. Rates and Expo can be custom tailored to each
pilot‘s own desired feel for each aircraft and often vary from
pilot to pilot and aircraft to aircraft.
Step 11. Travel Adjust
Dual Rate and Exponential

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1. In the Function List screen use the roller to highlight 13.
D/R & EXP and press the roller to access the Dual Rate and
Expo screen.
2. Rotate the roller to highlight the channel in the upper left of
the screen and press the roller. Select AILE, ELEV or RUDD
by pressing the roller.
3. Rotate the roller to highlight the desired D/R value. Note
the positions (POS0, POS1, POS2) are activated via
the corresponding D/R switch or Flight Mode Switch if
selected. Press the roller to select, rotate the roller to set
the value and press the roller to select. Moving the stick
in either direction will select direction if a different rate is
desired in each direction.
4. Rotate the roller to highlight the desired EXP value. Note
the positions (POS0, POS1, POS2) are activated via
the corresponding D/R switch or Flight Mode Switch if
selected. Press the roller to select, rotate the roller to set
the value and press the roller to select. Moving the stick
in either direction will select direction if a different rate is
desired in each direction.
1. In the Function List screen use the roller highlight 15. Sub
Trim and press the roller to access the Sub Trim screen.
2. Rotate the roller to highlight the desired channel that you
wish to adjust the sub trim and press the roller to access
that channel.
3. If necessary adjust the sub trim for all channels. Note that
minimal subtrim should be used. When possible, reposition
the servo horn on its spline to an improved position that
will require the least amount of sub trim.
Step 12. Adjusting Rate and Expo Values
Step 13. Sub Trim

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1. In the Function List screen use the roller to highlight 16.
THRO Hold and press the roller to access the Throttle hold
screen.
2. Rotate the roller and highlight INH then press the roller to
access the throttle hold screen and activate throttle hold.
3. Rotate the roller to select the HOLD Pos. then press the
roller. Rotate the roller to program the throttle hold position.
Adjust the throttle hold position so that either the throttle
does not move with the throttle stick at low and the throttle
trim at the normal flight position, or if a throttle kill function
is desired, adjust the value such that the throttle servo
moves the throttle back to kill the engine.
Step 14. Activating Throttle Hold

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1. In the Function List screen use the roller to highlight 18.
THRO CURV and press the roller to access the all servos
hold screen. Press YES or NO to access the Throttle Curve
screen.
2. If you wish to have different throttle curves selected via
a switch or flight mode, rotate the roller to highlight SW
SEL and press the roller. Rotate the roller to highlight the
desired switch or flight mode and press the roller. To switch
between throttle curves on the throttle curve screen once
selected, move the selected switch to the desired position.
3. Rotate the roller to highlight the desired point that you wish
to change (L, 1 or H) then press the roller to access that
point.
4. Rotate the roller to adjust to throttle curve at the selected
point.
5. To add additional points in the curve, move the throttle stick
to the area desired until the STOR option appears on the
bottom left side of the screen. Press the bottom button on
the left to store a point at this location. Adjust the value as
described in the above steps.
Step 15. Programming Throttle Curves

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When Ailerons are deflected, the Aileron that deflects downward
typically creates more drag than the Aileron that deflects
upward. If the difference in drag is great enough, it will cause
the aircraft to yaw in the direction of the down Aileron, i.e. a
roll to the right will cause the aircraft to yaw to the left because
the left Aileron deflects downward and creates more drag. This,
of course, is an undesirable tendency that results in non-axial
rolls and a loss of heading. The Aileron Differential function
allows adjustment of the Aileron that deflects downward without
affecting the Aileron that travels upward and, therefore, can
eliminate yaw tendencies in rolling maneuvers. It can also affect
only the Aileron that travels upward—this is called negative
differential and is useful if an aircraft yaws in the same direction
as the Aileron input. Most aircraft require a small percentage of
positive differential, though composite aircraft that are top skin
hinged require a small percentage of negative differential.
1. In the Function List screen use the roller to highlight 32.
DIFFERN. and press the roller to access the Differential
screen.
2. Rotate the roller to highlight Pos.0 and press the roller to
select.
3. Rotate the roller to adjust the value and press the roller to
select. Adjust this value in flight to make the aircraft roll
axially with aileron input.
4. If desired, 2 differential settings are available by rotating
the roller to select SW SEL and press to select. Then select
the switch or flight mode desired to select. Once selected,
set the Pos.0 and Pos.1 values as desired. Generally only a
single differential setting is required.
Step 16. Programming Aileron Differential

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The balance function is used to adjust the throw of dual servo
setups or quad aileron servo setups to fine-tune the throws
of the channels to equal one another throughout the servos
movement. This function is especially useful for matching
multiple servos on a single aileron or rudder, however, has
benefits for matching throws between elevator halves and
similar functions. Note that the Balance screen will display the
functions that are programmed in the Wing Type. If Flaperon
only is programmed, only one aileron column will appear in the
balance screen. If 4- ailerons are selected, then two columns
will appear in the balance screen. This also applies to the dual
elevator and rudder functions.
1. In the Function List screen use the roller to highlight 33.
Balance and press the roller to access the Balance screen.
2. Rotate the roller to highlight the desired position to set and
press the roller to select.
3. Rotate the roller to adjust the value and press the roller to
select. Adjust these values as necessary to set the throws
to match. In the case of multiple servos per surface, use
this function to match the throws of the servo through the
servo‘s range of movement in conjunction with the use of
a current meter, such as Hangar 9 model number HAN172
Digital servo & receiver current meter to minimize amp
draw of the servos.
Step 17. Programming the Balance Function

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The Rudd->A/E function is a pre-programmed mix, mixing
rudder to aileron and rudder to elevator and is used to improve
knife - edge tracking. Generally this function is used to mix
a small percentage of down elevator with rudder and a small
percentage of aileron with rudder to make the aircraft track
straight in knife - edge flight . Generally the percentage of the
mix is in the range of 2-10% for both rudder to aileron and
rudder to elevator, but this does vary depending on the severity
of the coupling of the aircraft. The direction of the knife - edge
coupling also varies, so this will need to be set and adjusted
after flying the aircraft.
1. In the Function List screen use the roller to highlight 64.
RUDD->A/E and press the roller to access the RUDD->A/E
screen.
2. Rotate the roller to highlight the AILE Pos0 value and press
the roller to select.
3. Rotate the roller to select the value and press the roller to
select. Repeat this procedure for the ELEV Pos0 value.
4. If desired, a switch or Flight Mode can be selected by
rotating the roller to highlight the switch or Flight Mode
desired and press the roller to select. Then set the Pos0
and Pos1 values for AILE and ELEV as desired. Generally a
single value is required for this mix, as the rudder coupling
is present in the aircraft at all times.
Step 18. Programming Rudder to Aileron and Elevator Mixing