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
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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
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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