JR ProPo 28X User manual

28X_EN.indd 2 2015/02/27 13:42

▋Contents
▊▊Introduction
 1-1
 1-2
▊▊General▊Information
  2-1
Antenna 2-1
Sticklengthadjustment  2-1
Neckstrapattachment  2-1
Cleaningthetransmitterandscreen  2-1
Turningthetransmitteron  2-1
Warningdisplay  2-1
Unlockingthescreen  2-2
TransmitterLED’s  2-2
Shuttingdownthetransmitter  2-2
InsertingandremovingtheSDcard  2-2
USBports,headphonejack,trainerjack,chargejack  2-2
Insertingandremovingthetransmitterbatteries  2-3
Chargingthetransmitterbatteries  2-3
Voiceprompts  2-4
28channels–upto14msrefreshrates  2-4
RG712BXreceiver  2-4
Stickmode  2-4
  2-6
▊▊Functions▊Common▊to▊All▊Models
  3-1
  3-2
  3-2
  3-3
 3-4
Listofreceiverconnectingchannels  3-5
Installingtelemetrysensors  3-5
  3-5
Receiverantennaconsiderations  3-6
 3-7
  3-7
  3-8
 3-9
  3-11
  3-11
Aboutitemsandwidgets  3-12
  3-13
  3-13
 3-13
  3-14
Wallpaper 3-14
Systemsettings 3-14
  3-15
 3-15
  3-16
Airplanefunctionandsystemlists  3-16
Helicopterfunctionandsystemlists  3-17
Gliderfunctionandsystemlists  3-17
Other 3-18
Widgets 3-18
  3-18
Airplane 3-18
Glider 3-19
Helicopter 3-19
  3-20
Functionsthatcanbeselectedbyightmode  3-20
Functionsrelevantfordi󱐯erentmodeltypes  3-20
Displayofthecurrentightmode  3-20
Airplane 3-21
  3-22
▊▊Function▊List
  4-1
  4-4
  4-5
  4-6
  4-7
 4-8
  4-9
  4 -11
  4-13
  4-15
4-18
  4-19
  4-21
28X_EN.indd 1 2015/02/27 13:42

  4-23
  4-24
  4-25
 4-26
  4-28
  4-29
  4-31
  4-33
  4-35
  4-36
  4-37
 4-39
  4-40
  4-41
  4-44
  4-46
  4-47
  4-49
 4-53
 4-55
▊▊System▊List
 5-1
  5-3
  5-3
  5-5
  5-5
  5-7
  5-8
  5-9
 5-9
 5-10
  5 -11
  5-13
 5-14
 5-15
  5-16
  5-17
 5-19
 5-20
  5-21
  5-22
▊▊Telemetry▊System▊6-1
▊▊Other▊Android▊Functions
 7-1
 7-1
 7-1
 7-1
 7-2
  7-2
 7-2
▊▊Widgets
  8-1
 8-1
 8-1
 8-2
  8-2
  8-2
  8-2
 8-2
 8-2
 8-2
 8-2
 8-2
 8-2
 8-2
 8-2
▊▊Other▊Information
  9-1
  9-1
 9-1
28X_EN.indd 2 2015/02/27 13:42

1-1

▋Features
Your new 28X is one of the nest model aircraft transmitters ever created.
It sets a new benchmark in performance and ergonomics. In order to make
full use of the features of this radio and to safely enjoy your RC activities,
please carefully read this operation manual.
⿟Integrated touch screen android interface
The 28X is the rst RC system to o󱐯er an Android operating system. This
technology is accessible through a 480 x 273 pixel, 4.3" WQVGA-TFT
full-color touch screen. The transmitter is equipped with dual processors
to allow for smooth interfacing and reliable radio frequency output. The
user interface is also customizable, so you can change the wallpaper and
color schemes to suit your preferences. There is 4GB of internal memory
with 512MB RAM
⿟28 channels – up to 14ms refresh rates!
The transmitter is congured for sixteen 14ms channels. If you require
more than 16 channels, you can choose to add four (56ms) channels
at a time, in place of one 14ms channel. So the nal 28 channels are in
a configuration of twelve 14ms channels, and sixteen 56ms channels.
Note all the channels are proportional, and you are unlikely to notice a
di󱐯erence in response between the 14ms and 56ms channels.
⿟CNC aluminum ball-bearing supported gimbals
The 28X stick units have 65,536 step stick resolution, which is 16
times more precise than any other RC transmitter. The CNC machined
aluminum gimbals are supported by ball bearings and can be adjusted to
suit any pilot.
⿟Customizable audio and vibration alerts
Another great feature of the JR 28X is an audio controller, which you
can use for voice, music and telemetry notifications. These audio and
vibration notications can also be customized as you see t.
⿟Custom 28X transmitter case included
The custom designed transmitter case opens from the top, and provides
secure storage for your transmitter.
⿟Safety power switch design
The transmitter has been designed with a push button power switch that
will prevent accidental powering on and o󱐯. You will also notice how the
antenna is removable, allowing for safe storage.
⿟Aluminum chassis
This JR transmitter is contained within a strong, cast aluminum chassis
and comes with an integrated USB host controller and USB device port,
allowing for easy data interfacing and PC connection. The radio has an
external SD card slot to give you additional storage space for models,
images, sound and telemetry data.
⿟JR’s revolutionary DMSS system
The 28X uses JR's proprietary 2.4GHz DMSS protocol for a super secure
RF link. JR’s newly developed DMSS system maintains high speed servo
response while allowing simultaneous use of telemetry functions. The
high-speed telemetry function allows information from the aircraft (that
was previously unknown to the user) to be monitored on the transmitter.
In addition, alarms with unique sounds alert the user to the situation on
the aircraft without even looking at the screen.
⿟Stick dial
A stick dial has been added on both sticks. Two additional channels can
be assigned to these.
⿟Long lasting power
The JR 28X comes with one 3200mAh Li-Ion battery, and supports an
optional second battery for extended operation. The included charger
fully charges the transmitter in approximately 3 hours.
⿟Multiple ight modes
Fifteen flight modes are available for each aircraft type (acro/heli/
sailplane). Each ight mode can be fully customized.
⿟Curve adjustment by trim device
Trim input switches can be used for adjustment of almost all mixing
curves and other functions during flight. The entire curve can be
increased/decreased using the trim input switch while the curve shape
does not change, or alternatively individual points on a curve can be
adjusted during ight.
⿟Wing types
Many varied pre-settings help as a wizard during the set-up: 4 aps, 4
ailerons, 2 spoilers, 4 engines, etc.
NEM-B77A
▋
Item Specication
Part Number: NET-T1128G
Type of control: 28 channel computer mixing
RF: 2.4GHz
Modulation: DMSS(Dual Modulation Spectrum System)
2.4GHz FHSS Spread Spectrum Method
Power source: 7.2V Li-Ion battery x 2 (each 3200mAh
2L3200(3200mA) ※ 1 or 2 batteries can be used
Neutral position: 1.5ms
28X_EN.indd 1 2015/02/27 13:42

1-2

▋Safety Information
JR Propo cannot be held responsible for any accident or failure that may
occur due to any modification of this product, use of non-genuine parts,
natural disaster, or nonobservance of the precautions described in this
manual. Further, for damages caused by an accident or failure, please
understand that items (excluding this product and this Company’s genuine
parts) such as aircraft, competitor’s products, etc will not be covered under
the warranty.
The use of radio waves required by this product is dened in the Radio Law
of Japan.
⿟When this product is used overseas, authorization by the law of the
country will be required.
⿟When this product is used overseas for a purpose other than as
radio control system for a model, it may be subject to restrictions in
accordance with the Export Trade Control Order. In such a case, an
export permit under the Order is required. This is the responsibility of
the end user.
▋▋Basic▋precautions▋for▋safe▋use▋of▋the▋2.4GHz▋band
The 2.4GHz band is not exclusively for use with RC aircraft. This frequency
band is also used by ISM (industry, science, and medical care) products. It is
also used for short distance microwave transmissions, wireless LAN, digital
cordless phones, audio games, cellphone Bluetooth, etc. Therefore, control
response of a 2.4GHz system may be degraded in urban areas. Further,
as it is also used for ham and local area radio communications for mobile
identication, please pay attention to possible inuences from these. In the
event of any adverse radio wave interference, immediately stop emitting
radio waves and seek to solve any issues..
⿟At a race track or airfield, minimize use of devices that can affect the
transmitter/receiver and always conrm a solid RF link before ight by
performing a range check.
⿟If an aircraft is allowed to y behind a building, trees, etc. the RF signal
may be blocked and control response may drop, even resulting in an
‘out-of-control’ situation. Always y the aircraft within a range that can
be visually observed.
▋▋Indications▋and▋symbols▋related▋to▋safety
The following symbols are used in this manual to indicate the precautions
regarding possible danger which may occur following improper handling.
Be sure to strictly observe them, as they contain important safety
instructions. If incorrect operation methods are used, there will be a danger
of death or serious injury, and/or damage to property.
▋
Before using this transmitter for the first time, check that all the parts
and accessories have been provided. First fully charge the transmitter and
receiver batteries. Next, connect the switch harness, battery and servos
to the receiver. Turn on the transmitter then receiver and confirm that
they operate correctly. If they do not operate, rst check the batteries. If
a rechargeable battery is being used for the rst time after purchase, or is
being used after being left unused for a long period, be sure to charge it
with the battery charger before use. Conrm the transmitter and receiver
are correctly bound.
 Out-of-control and dangerous situations can be caused.
DO NOT use the product on rainy days since it may malfunction if
water gets inside the transmitter or receiver. If use is a necessity, be
sure to take appropriate waterproong measures.
 Injury due to heat generation, re, or electric shock can occur.
Never disassemble or modify this product.
▋
Item Specication
Part number:
#04029 NEC-A1530
Four plug adaptors included (European, UK,
USA, Australia)
Input voltage: AC100V-240V 50/60Hz
Output voltage: DC15V 30W
If incorrect operation methods are used, it may result in death or
serious injury.
DANGER
If incorrect operation methods are used, there will be a possibility of
death or serious injury.
WARNING
If incorrect operation methods are used, it can be expected that
problems will occur.
CAUTION
DANGER
28X_EN.indd 2 2015/02/27 13:42

1-3

 The engine or motor (in the case of an electrically-driven model)
can start rotating at high speed, causing danger.
When turning on the power switch, set the transmitter throttle stick to
the lowest speed position (where the engine/motor is o󱐯) and turn on
the transmitter power switch, and then the receiver power switch in
this order. When turning o󱐯 the power, turn o󱐯 the receiver and then
transmitter in this order.
 Injury can be caused.
When adjusting the engine (or motor), pay attention to the dangers
presented.
 DO NOT start the engine with the transmitter throttle in a high
speed position. This is very dangerous.
 Failure can be caused.
DO NOT use this transmitter in combination with a competitor’s
product (receiver, servo, gyroscope, etc).
 Malfunction can be caused.
As the electronic parts mounted on the transmitter and receiver are
susceptible to impact, do not allow a strong impact (crash) or drop
them.
 Out-of-control and dangerous situations can be caused.
When degraded servo movement is detected, immediately stop
operating and check the battery power remaining, RF link, servos, etc.
 DO NOT use the product in the following places, as there is a risk
of an out-of-control state or an accident occurring:
RF interference exists.
Flying near to tra󱐰c consisting of cars or motorbikes.
Near a high-tension electric line, building, bank, or in a mountainous
area.
Near a FM/TV station, or any radio transmitting station.
Near residences and buildings, and near people.
 A sudden malfunction may occur and will be dangerous.
If the receiver, servo etc. get water logged, they may look to operate
normally. However, they may fail at any time in the future. Do not
continue to use the product, and contact your JR dealer or distributor
to arrange an inspection regardless of normal operation.
 Prior to ying, check the following items for safety:
Is there enough battery charge remaining in the transmitter and
receiver?
Is there any fuel spillage on the receiver, servos, etc. which was
caused by leakage from the fuel tank? Is there enough fuel? Check
that no linkage is in contact with the aircraft body. Also, conduct a
vibration test by setting the engine (motor) to high while holding
the model and confirm that each control surface moves correctly
(airplanes only).
 In the case of the initial flight, avoid flying at great distances,
choose a safe place, and perform flying practice in close vicinity
for several minutes.
▋
Abide by the following to prevent potential leakage, explosion, heat
generation, or re.
 The AC/DC Adapter is multi-voltage (100V-240V). Be sure to use
appropriate outlet plugs.
 DO NOT use any adapter with (+) or (-) set in the opposite direction.
 DO NOT place near re or heat.
 DO NOT connect (+) or (-) to any material that may conduct
electricity including metals (wire, etc.), carbon materials, etc.
 DO NOT disassemble, remodel, or solder.
 It may cause a loss of vision if the liquid inside the battery gets
into your eyes.
Consult a doctor immediately after washing eyes with clean water, and
do not rub the eye areas.
 Failure can be caused.
Only use genuine JR batteries. Stop charging when the specified
charging time is complete.
 DO NOT allow the battery to get wet with water or sea water.
 DO NOT damage or tear o󱐯 the insulating tube, the lead wire, or
the connector.
 DO NOT use the battery if there is damage to the insulating tube,
lead wire, or connector, or if the insulation is damaged.
 Skin may be damaged if leaked battery liquid stays on your skin or
clothes. Wash away immediately with clean water.
 Out-of-control and dangerous situations can be caused.
WARNING
CAUTION
DANGER
WARNING
28X_EN.indd 3 2015/02/27 13:42

1-4

The rechargeable battery is composed several individual batteries. Note
that the actual battery level cannot be precisely conrmed by testers
such as a battery checker. Check the state of charge in a comprehensive
way by using a battery checker, checking the recharge time, and
operating time.
 Do not store the battery in a place with high temperature/humidity
or dust.
 Store the battery out of reach of children.
 Do not charge the battery in a place with low temperature (below
zero degrees Celsius).
 Dispose of old batteries according to the local disposal regulations
- do not throw them away in garbage cans, etc.
▋
Used Li-Ion batteries are important resources. Place a piece of tape or
similar over the terminal areas, and drop them o󱐯 to recycling depots that
collect small rechargeable batteries.
CAUTION
28X_EN.indd 4 2015/02/27 13:42

2-1

▋Introduction to the Transmitter
Your new JR 28X will provide years of reliable service. To get the best
performance from your new transmitter, please be sure to fully understand
all its controls and functions. Reading this manual will help greatly with
this task.
▋▋Antenna
Always have the antenna installed when using the
transmitter. Tighten the antenna with your hand
to prevent it from loosening. Confirm it is tight
before ight.
▋▋Color▋touch▋screen
The 28X features an all new color touch screen. This is used to quickly
program even very complex functions within the radio. The screen should
only be operated using light nger pressure. Never use a sharp object such
as a pen, etc to press on the screen.
▋▋Switch▋identication
If you look closely at the transmitter, you will see that each switch is labeled
with a letter (A, B, C, etc), as are the various digital auxiliary controls 
.
▋▋Stick▋length▋adjustment
Undo the recessed set screw
located at the tip of the control
stick. Now rotate the entire
stick to adjust its length. When
finished, lock the recessed set
screw.
▋▋Neck▋strap▋attachment
For added comfort and stability during
use, you may choose to use a neck strap.
▋▋Cleaning▋the▋transmitter▋and▋screen
Your transmitter and screen can be cleaned using a soft cloth – ideally
a microfiber cloth, as sold for cleaning eyewear. Never use solvents or
detergents when cleaning your transmitter.
▋▋Turning▋the▋transmitter▋on
To turn the transmitter on, briey press the power
button located on the face of the transmitter.
The first time the transmitter is turned on for a
day’s flying, the boot time is approximately 30
seconds.
▋▋Warning▋display
If the transmitter is turned on and the
transmitter stick or other switches are
in incorrect positions, a warning tone
is generated and the following screen
appears.
The stick position or switch(s) creating
the warning are identified on this
screen. Simply move the controls
to the correct position to cancel the
warning.
You can customize the warnings for
each model by setting the warning
parameters in the warning menu 
This menu can be accessed
directly from the warning display.
Lock
Unlock
ロック
ロック解除
Flight mode switch
(location depends on selected model)
Throttle stick
28X_EN.indd 1 2015/02/27 13:42

2-2

▋▋Unlocking▋the▋screen
If the screen lock has been activated, simply swipe the padlock icon toward
the top of the screen.
▋▋Transmitter▋LED’s
⿟A blue LED in the center of the switch indicates RF transmission.
⿟A red LED in the center of the switch indicates no RF transmission.
⿟A green LED in the center of the switch indicates firmware update in
process, or error.
⿟Green LED’s at either end of the switch indicate battery(s) on charge.
⿟The LED brightness can be adjusted - 
▋▋Shutting▋down▋the▋transmitter
The transmitter is turned o󱐯 by again briey pressing the power button,
and it will automatically enter a standby mode. If the transmitter has been
off for less than 3 hours, and then turned on again, it performs a quick
boot, powering up immediately. This is very handy when you are turning
the transmitter on and o󱐯 several times during a day’s ying. After being
o󱐯 for longer than 3 hours, the transmitter will automatically complete a
full shut down.
A full shutdown also occurs when the charger is plugged in.
▋▋Inserting▋and▋removing▋the▋SD▋card
For maximum compatibility and
reliability, we recommend you
purchase a JR branded SD card.
If you choose to use a third party
card, please ensure it is less than
32GB in size, and formatted in
FAT. Inserting and removing
SD cards should be carried out
with the transmitter switched
o󱐯. Alternatively, it is possible to
unmount the SD card from the
settings, storage menu ‘Unmount
External Storage’. From the
same menu, it is possible to mount a SD card inserted with the transmitter
turned on. The SD card slot is located under a cover on the right side of the
transmitter.
▋
Switch o󱐯 the transmitter, and then slowly insert the SD card into the slot
until you feel a . Note correct orientation of the card.
▋
Lightly press in the middle of the SD card until it clicks - the card will pop
out slightly when you remove your nger – now carefully pull the card out
the rest of the way.
▋▋USB▋ports,▋headphone▋jack,▋trainer▋jack,▋charge▋jack
These ports are located under a protective cover on the back of the
transmitter.
▋
There are two USB ports available. One allows you to plug in a USB
memory stick, and access les from it. The USB stick should be inserted and
removed with the transmitter turned o󱐯. Please do not use a USB extension
harness to connect USB Memory devices - plug the devices in directly. The
second USB port (mini USB) is for factory service only - do not connect any
harness or cable, or connect the transmitter to your PC.
▋
Useful at a crowded field, the headphone jack (also known as a phone
jack) supports commonly available stereo headphones. With headphones
plugged in, you are able to listen to music or transmitter alerts (including
telemetry) without disturbing others.
Pilot Lamp（LED）
Charge lamp: Battery A
Charge lamp: Battery B
28X_EN.indd 2 2015/02/27 13:42

2-3

▋
The 3.5mm mono trainer jack
is accessible here to allow flight
training to take place. Please
see  for information
regarding the trainer system.
▋
The charge jack is conveniently
located under this cover. Please
refer to  for information
on charging the transmitter.
▋▋Inserting▋and▋removing▋the▋transmitter▋batteries
󰴤Always ensure the transmitter is turned off before removing the
batteries.
󰴥Slide the battery cover latch on the rear of the transmitter to the right.
The battery cover can now be carefully opened.
󰴦The batteries can now be removed. Be careful to press the lever lock
before removing the battery power lead. The battery temperature lead
can be carefully pulled straight out.
󰴧When tting new batteries, be sure to only use JR genuine replacement
Li-Ion packs designed for the 28X. Carefully fit the battery power
connector and temperature sensor lead. Ensure that the battery power
and temperature leads are correctly plugged into their corresponding
sockets. When closing the battery cover, be careful not to pinch any
wires, and ensure the latch engages fully.
▋▋Charging▋the▋transmitter▋batteries
The transmitter operates exclusively using genuine JR Li-Ion batteries. One
battery is supplied, and a second may be purchased as an optional extra
for extended operation. If using one battery, it can be in either the upper or
lower battery location. Do not use the transmitter with other rechargeable
batteries or with dry cell batteries. The temperature sensor lead must
remain connected for charging to be successful. During charging, the
transmitter should be switched o󱐯. When the transmitter is on, charging
will not take place.
※ Note that if using a flight simulator with the control cable plugged
into the trainer jack (and the power switch o󱐯 on the transmitter), it is
possible to plug the charge cable into the transmitter and use the power
adaptor to supply power. Since the built-in battery will not be used,
this will allow extended simulator time while not running down the
transmitter battery packs. However, the internal batteries will not charge
with the trainer lead plugged in.
󰴤Insert the power adaptor into an AC electric power socket.
󰴥Insert the plug of the adaptor as far as it will go into the DC power jack
of the transmitter. The DC power jack is located under a cover on the
rear of the transmitter.
󰴦Either one or two green LED’s will illuminate at the top and bottom of
the switch. These represent the one or two batteries installed in the
transmitter. If the appropriate number of LED’s do not illuminate, an
error may have occurred. In this situation, detach the power adapter
plug, and re-insert it. If the LED(s) do not light even after the cable has
been removed and inserted several times, please contact your JR agent
or distributor in your country.
󰴧During charging, the LED(s) will remain illuminated. When charging
A
B
2L3200
A
B
2L3200
A
B
2L3200
A
B
2L3200
28X_EN.indd 3 2015/02/27 13:42

2-4

is complete, the LED(s) will switch off. The standard charging time is
approximately 3 hours, regardless if one or two batteries are being
charged.
󰴨After charging is complete, detach all the connections. Do not leave the
charger connected to the transmitter.
※ Be certain to only use the genuine JR 28X dedicated power adapter.
Charging is not possible using other adapters. Further, do not use this
power adapter for charging products other than the 28X.
 Abnormal heat generation
may cause explosion of the
battery!
After charging is complete, detach all of the connections including the
AC adaptor from the power outlet.
Never leave the AC adaptor connected to the transmitter or plugged
into the AC outlet. This is to avoid possible fire risk after charging
the battery. Do not use the AC adapter while the cord is still bundled
together, since there will be a risk of heat generation.
▋▋Voice▋prompts
By default, the ight mode indicator widget provides information on which
ight mode is currently selected. Voice annunciations can be turned on and
o󱐯 by touching the ight mode widget on the home screen. FM information
is announced in preference to telemetry. Announcements are only made
when the ight mode name is an English word. Telemetry widgets include
common settings such as unit selection, voice output, and no link alarm. See
.
▋▋28▋channels▋–▋up▋to▋14ms▋refresh▋rates
The transmitter is configured for sixteen 14ms channels. If you require
more than 16 channels, refer to the channel setting menu  for
information on channel conguration.
▋▋RG712BX▋receiver
The transmitter may be supplied as a combo with a 7 channel antenna
diversity receiver – the RG712BX. This receiver has 7 PWM servo outputs,
and an XBus port to allow expansion to utilize all the channels and features
of this transmitter.
Please refer to the included receiver manual for details.
▋▋Stick▋mode
Changing the stick mode is done in the channel setting menu, by re-
arranging the stick inputs for throttle, aileron, elevator and rudder as
required. Please see  – channel setting - for information on
dening control input devices.
For some mode changes the spring function on the elevator and throttle
sticks must be changed. Please see  for information on this
procedure.
⿟Settings related to the swash type or wing type are not performed
here. Be sure to set the swash type or wing type using the appropriate
functions in the system menu .
⿟Note a dedicated function for changing stick mode is not used or
required.
▋ 
 
S1
 
S2
 
S3
 
S4
▋ 
 
S3
 
S2
 
S1
 
S4
▋ 
 
S1
 
S4
 
S3
 
S2
▋ 
 
S3
 
S4
 
S1
 
S2
▋
Be sure to calibrate both stick gimbals after changing the stick mode. Refer
to the  for calibration information.
Power source jack for
recharging(DC15V)
To the AC Electric
Power Outlet
To the Rechargeing Power Source jack
（Exclusively for transmitters with built-in
Li-ion rechargeable batteries）
15V 30W AC Adapter for Recharg-
ing(NEC-A1530)
※ Note: This adapter can only be used
when plugged into the 28X it is not
a stand alone charger.
WARNING
28X_EN.indd 4 2015/02/27 13:42

2-5

S3
S4
S1
S2
Mode 1
CH1 Throttle
CH2 Aileron
CH3 Elevator
CH4 Rudder
S3
S4
S1
S2
Mode 2
CH3 ElevatorCH3 Elevator
CH2 Aileron
CH1 ThrottleCH1 Throttle
CH4 RudderCH4 Rudder
S3
S4
S1
S2
Mode 3
CH1 Throttle
CH4 Rudder CH4 Rudder
CH3 ElevatorCH3 Elevator
CH2 AileronCH2 Aileron
S3
S4
S1
S2
Mode 4
CH3 ElevatorCH3 Elevator
CH4 Rudder CH4 Rudder
CH1 ThrottleCH1 Throttle
CH2 Aileron CH2 Aileron
28X_EN.indd 5 2015/02/27 13:42

2-6

▋Stick spring tension and travel adjustment
▋▋Stick▋spring▋tension▋adjustment
⿟Remove the batteries before carrying out any adjustments.
⿟Remove the molded rubber sections from the back of the transmitter.
⿟Adjust the springs to the desired spring tension. By carefully adjusting
each of the screws, you can achieve a range of spring tensions.
▋
Turn B counterclockwise. This increases the spring pressure to return the
stick to center.
If there is play near center, turn E counterclockwise two or three turns.
Do not turn E too much, otherwise it may fall out. Use the included 1.5mm
ball ended hex wrench to make adjustments.
▋
Adjust A to achieve the desired stick tension. Use the included ball ended
hex wrench, which will need to be inserted at a slight angle. Turn clockwise
for less tension.
⿟Replace the rubber covers.
See the following section for information on changing the throttle stick
feel from smooth clutch to ratchet.
Never touch the printed circuit board or any related parts inside the
transmitter.
Touching the board may result in electric shock, uncontrolled microcomputer
operation, or damage to model data, and normal operation may become
impossible.
▋▋Elevator▋and▋throttle▋stick▋conguration▋(mode▋change)
Sometimes when changing transmitter modes, you may find it necessary
to swap the functions of the elevator and throttle sticks, which would
necessitate changing the friction and spring functions.
Either stick can be congured as either elevator or throttle sticks. Screws B
to E are adjusted using the included hex wrench.
▋
Turn B clockwise until it stops.
This reduces the spring pressure on the return to center.
Turn E clockwise until it stops.
This reduces the spring pressure to zero, disabling it to return to center.
Turn C clockwise for helicopter throttle or D clockwise for airplane. This
A BEDC
A
BEDC
28X_EN.indd 6 2015/02/27 13:42

3-1

increases the pressure on the throttle clutch, as either a smooth feel or
ratchet.
Adjust the pressure to the desired strength, while testing the throttle
stick feel.
▋
Reduce the pressure of the throttle clutch to zero.
Turn C counterclockwise for helicopter throttle or D counterclockwise
for airplane. This reduces the pressure of the throttle clutch.
When the throttle becomes free and moves with no load, stop adjusting
the screw C or D.
Do not loosen the screw too much, otherwise it may fall out.
Turn E counterclockwise ten times.
Do not turn E too much, otherwise it may fall out.
At this point, do not turn the screw more than ten turns.
Turn B counterclockwise.
This increases the spring pressure to return the stick to center.
▋
If there is play near center, turn E counterclockwise two or three turns.
After making this hardware change, it is necessary to go to the channel
setting menu  to dene which functions will be performed by
which sticks. This transmitter does not have traditional mode selection -
functions are simply freely dened in the channel settings menu.
▋
Do not disassemble the transmitter. Disassembly may result in electric
shock, microcomputer error or data corruption, disabling normal operation
or control.
▋▋Throttle▋stick▋travel▋adjustment
By adding optional throttle stroke adjustment blocks to the gimbal, the
throttle stroke can be adjusted. The same procedure can be used to
decrease elevator stick travel if required. There are four di󱐯erent adjuster
blocks available. The adjuster blocks can change the stick stroke angle by
-5 °, -10 °, -15 °, and an option for xing the throttle stick in the neutral
position. More information is provided with the adjustment blocks.
When adding this  it is essential to recalibrate the throttle
stick range. Be sure to follow this procedure.
▋▋Caution▋note
Be sure to calibrate both stick gimbals after changing stick travel. Refer to
the for calibration information.
 After the adjustments described above, be sure to confirm the
output channels in channel settings .
The concept of mode (such as 'mode 1' and ”mode 2') are no longer
used. You freely dene which function is allocated to which stick in the
channel setting function.
 Do not dismantle the transmitter.
Doing so may cause an electrical shock, a microcomputer crash, and
damage to model data, resulting in a product that does not function or
operate as it should.
▋Installing the stick vertical angle
control blocks
Remove the four screws 󱱕
Remove the two vertical angle control block covers 󱱖
Insert your choice of vertical angle control blocks 󱱗
Five lengths of vertical angle control blocks 󱱗 are available.
The blocks reduce the range of the stick movement.
Two vertical angle control blocks (gold) of -7.5° are provided as a standard.
The other types of angle control blocks are sold as optional items. Please
purchase them as required.
Put the vertical angle control block covers 󱱖 on the blocks and securely
tighten the screws 󱱕.
Applying a small amount of a weak thread lock agent to the screws ito
prevent them from loosening (eg JR screw Lock soft type - red).
After replacing the vertical angle control blocks, be sure to carry out
B
C
B
Vertical angle control blocks -7.5°
AA
AA
Thread lock
▋
⿟Movement -5°: Silver
⿟Movement -10°: Black
⿟Movement -15°: Red
⿟Movement STOP: Blue
28X_EN.indd 1 2015/02/27 13:42

3-2

stick calibration .
※ When turning on the transmitter, a warning may be issued after
replacing the blocks. To release the warning status, display the warning
screen, touch , and increase the numeric value for the position
of the throttle stick.
※ After carrying out stick calibration, be sure to return the warning value
to the original setting .
▋Changing the stick horizontal angle
control blocks
Remove the four screws 󱱕.
Remove the two horizontal angle control block covers 󱱖.
Remove the horizontal angle control blocks 󱱗.
Securely t the projections of the horizontal angle control blocks 󱱗 into
the grooves for the horizontal angle control blocks.
The stick movement angle can be adjusted in five levels by selecting
which grooves to use.
Put the horizontal angle control block covers 󱱖 on the blocks and securely
tighten the screws 󱱕. Applying a small amount of a thread lock to the
screws is recommended to prevent them from loosening (eg JR screw lock
soft type - red).
After changing the position of the horizontal angle control blocks, be
sure to carry out stick calibration .
▋Removing and installing the stick switch
▋
Place the stick switch knob in the center position as shown below.
Remove the socket screws 󱱕 and 󱱖.
Slowly pull out the stick switch while keeping the knob centered.
▋
Thread lock
A
CC
A
AA
B
B
A
B
Pull slowly while keeping the
knob centered
A
B
Notch surface 1
Notch surface 2
Align the notch surfaces 1
and 2 with the holes for
the screw A and push the
stick switch slowly.
Thread lock
28X_EN.indd 2 2015/02/27 13:42

3-3

Insert the stick switch while keeping the notch surface 1 and the notch
surface 2 aligned with the hole for the socket screw 󱱕.
Forcefully pushing the stick switch may cause damage to the equipment.
When the stick switch cannot be inserted easily, check the positions of
the notches and screw hole and try to insert it again instead of pushing
forcefully.
Conrm that the stick switch is fully inserted.
Look through the hole of the socket screw 󱱕 to check that the notch surface
1 is in line with the hole.
Be sure to tighten socket screw 󱱕 rst.
Conrm that the socket screw 󱱕 is tightened, and then tighten the socket
screw 󱱖.
Be careful not to install the socket screws in the wrong order. If doing so,
the center position cannot be set securely.
Applying a small amount of a thread lock to the screws to prevent them
from loosening (eg JR screw lock soft type -red).
Conrm that the stick switch knob moves smoothly.  for
information on calibrating the stick switch.
▋
⿟Remove the socket screw.
⿟Unscrew the stick head to remove.
⿟When installing the stick head, screw on till a slight gap of about 0.5mm
remains between the stick head and the knob of the stick switch main
body.
⿟Securely x the socket screw.
⿟Conrm that the stick switch knob turns smoothly.
▋Operating the stick switch
The stick switch knob can be turned as shown below.
Channels or control functions can be assigned to the switch.
-5°-5° StandardStandard -10°-10° -15°-15°
Fixed
(no horizontal stick movement)
Grooves for fitting the horizontal
angle control blocksProjections for fitting
Stick switch
main body
Stick head
Gap of about 0.5mm
Socket screw
28X_EN.indd 3 2015/02/27 13:42

3-4

▋Receiver connections
▋
The channels on the receiver are labeled with names rather than numbers.
These will not always match the names of the required functions,
depending on how you have congured the transmitter.
With reference to the transmitter monitor  and channel setting
screens, it is easy to conrm the output position of each servo.
If using more than 7 channels, optional XBus servos or XBus to PWM
converter harnesses make expansion easy. Please refer to XBus information
on the JR website.
Since all receivers are sensitive to vibration, shock, and water, anti-vibration
and waterproong measures should be implemented as necessary.
If the connectors become detached while ying, there will be a risk of the
model crashing. Please securely insert all connectors as far as they will go.
If extension leads are used during installation, sticky tape should be
wrapped round the connectors to secure them, or commercially available
safety clips used. Be absolutely sure not to leave the connectors hanging
unsupported.
▋
The connections to the receiver vary widely depending on your model
setup. The monitor screen  and channel setting menu 
 can be used to help identify exact servo connections. Always carefully
check each function and switch before ying.
▋
⿟The XBus system employs a serial data transmission method with
products supporting XBus instead of control using PWM signals which
have conventionally been employed for radio controlled aircraft. The
XBus signals contain all channels. Each device selects data that is
assigned to it and respond according to the data.
⿟Before connecting XBus products, carry out channel assignment using
the transmitter or other devices. Otherwise, the devices will not respond
to the signals. Do not directly connect conventional PWM devices to the
XBus output. Doing so may result in damage.
⿟The power supply can be separated using an optional JR XBus hub for
separate power supply.
※ *We recommend using a remote antenna when the receiver is mounted
on an aircraft where signal reception conditions are poor, such as one
made of carbon.
※ When using a remote antenna, be sure to carry out the binding process
with the remote antenna connected.
RG712BX Receiver
Receiver Battery
(sold separately)
SENSOR
Sensor(sold separately)
Connection
Diagram
Switch Harness
(sold separately)
When inserting the
connectors, take
note of the correct
direction.
Close up of the connector
Sensor Connections
When connecting sensors, use
a Y-Harness (sold separately)
connected to the [BIND/BAT-
T/SENS] terminal.
* It is not necessary to carry
out binding for the sensor.
Conventional servo
(sold separately)
X.Bus system products
Remote antenna
(sold separately)
Y-Harness
(sold separately)
RX
wiring example
Conventional Servo
X.Bus Compatible servo
BATTRY
BATTRY
HUB HUB
Output Port
(1ch)
(2ch)
(3ch) (4ch)
(5ch)
(6ch)
Servos can be operated
from a separate power
supply by using the
optional 'X-Bus power hub'.
※
X.Bus Compatible servo
X.Bus Compatible servoX.Bus Compatible servo
X.Bus Compatible servo
XBus PWM Converter
28X_EN.indd 4 2015/02/27 13:42

3-5

▋▋List▋of▋receiver▋connecting▋channels
▋▋Installing▋telemetry▋sensors
If installing two or more telemetry sensors, be sure to use the telemetry
sensor adapter shown below.
※ It is not necessary to bind the telemetry sensors.
▋2.4GHz RF characteristics
The 2.4GHz band radio waves are very directional. The receiver signal is
very dependent on the direction of the transmitter and receiver antenna.
Since the antenna receives radio waves from the sides rather than from the
tip, please appropriately position the receiver antenna when installing the
receiver in the model.
▋
Because the strongest radio wave radiate from the sides of the antenna, this
orientation allows the best transmission to the receiver and provides the
safest operation.
As strong radio waves radiate from the sides of the antenna, this orientation
provides the best transmission to the receiver for those who y helicopters
or airplanes. It is also the suggested orientation for those pilots who hold
the radio horizontally.
This position provides the best signal to the receiver for those who fly
gliders and also those pilots who hold the transmitter vertically to the
aircraft.
Receiver Helicopter Airplane Glider
 THRO THRO LAIL
 AILE AILE RAIL
 ELEV ELEV ELEV
 RUDD RUDD RUDD
 GYRO1 GEAR1 AUX05
 PIT. FLAP FLAP
 AUX07 AUX07 SPOI


S
S
S
S
S
W
28X_EN.indd 5 2015/02/27 13:42

3-6

▋▋Receiver▋antenna▋considerations
2.4GHz band radio waves have strong
directionality so receiving sensitivity
differs greatly depending on the
direction of antenna orientation.
If the antenna is attached directly to a shielding material such as carbon or
metal, the receiving sensitivity of the antenna is also considerably reduced.
⿟Multi coaxial antenna type receivers (more than one coaxial antenna
extending from the receiver): Be sure to install the antennas at right
angles to each other, rather than parallel.
⿟Single coaxial antenna type receivers: Avoid placing the antenna along a
carbon fuselage, or surrounded by metal materials.
Meaning of symbol
S
W
Strong radio wave transmited
to the aircraft, helicopter, etc.
Strong radio wave
Radio wave is weak.
Weak radio wave
Strong
Reception
Weak
Signal
Strong
Reception
Coaxial part of the antenna
can be bent however, do
not bend it in a sharp
angle. This will damage
the internal antenna wires.
The antenna part should be installed
in a perfectly straight condition.
RG Cable
※ The remote antenna receives data and also
feeds back to the transmitter (telemetry).
Remote Antenna
Built-in Antenna
▼ Front Face
▲ Rear Face
Strong
Reception
Weak
Signal
Strong
Reception
RA01T Side View Built-in Antenna
Circuit Board Face
RG712BX Receiver
The built-in antenna of the remote antenna is
installed on the surface of the circuit board.
Care will be required in the situation where the
built-in antenna has been installed beside a
shielding material, since the receiving sensitivi-
ty will be considerably degraded.
RX
RX
RX
RX
×Wrong Antenna Installation
If each antenna is installed in parallel,
the receiving efficiency will be reduced.
The arrows show the receiving direction with
regard to the antenna.
28X_EN.indd 6 2015/02/27 13:42