RG831B e
DATA : RG831B_manual_Rev.B
DATE : 2012.05.17
Receiver Specs
Product Number:
Receiving System:
Rated Voltage:
Operating Voltage:
DMSS 2.4GHz 8ch Receiver
(Coaxial antenna type, supporting bi-directional communications)
Operation Manual
Thank you for purchasing JR product.
To allow correct and safe use of this
product, be certain to read this operation
*Note that DMSS system are not compatible with DSM-2 nor DSM-J systems.
[About the TL Logo]
Remote Antenna Specs
8 Channel DMSS System
Coaxial antenna
(Antenna/Coaxial) 30/120mm
(Sold separately)
・Due to the use of the DMSS system, cross modulation is implemented. This
high sensitivity receiver is not easily affected by intermodulation interference.
・A telemetry system is incorporated that is capable of feeding back
information such as the aircraft remaining battery power.
・Due to the use of both a coaxial antenna and a remote antenna, secure and
precise communications can be realized.
・It is possible to confirm the receiving condition according to the lighting of
the LEDs.
・Support is provided for the fail safe settings in the transmitter.
DMSS System
Built-in Antenna Type
For connecting the sensor,
connect the Y-Harness
(sold separately) to the
[BIND/BATT/SENS] terminal.
* It will not be necessary to
carry out binding for the
Receiver Battery
(Sold separately)
■Please Read Before Use
Switch Harness
(Sold separately)
RG831B Receiver
The contents of this display column are
points that are assumed to have an
imminent danger of occurring, causing death
or serious illness to the user or a third party.
The contents of this display column are
points that are assumed to have the
possibility of occurring, causing death or
serious illness to the user or a third party.
The contents of this display column are points
that are assumed to have the possibility of
occurring, causing injury to the user or a third
party or causing damage to property.
The contents that should be observed
are divided and explained using the
following indications.
Obligatory Items are
explained using this indication. Prohibited Items are
explained using this indication.
Insert the connector,
taking adequate care
of the direction.
The following can cause out-of-control and dangerous situations.
Never disassemble or modify this product.
(In the case of an electrically-driven model,) the engine and the motor can start rotating at
high speed, causing danger.
Before turning on, set the transmitter throttle stick to the lowest speed position (so that the
engine/motor does not start at high power).
Turn on the transmitter first and then the receiver..
To shut down, switch off the receiver first and then the transmitter.
Injury can be caused.
When adjusting the engine (motor), pay full attention to the power that can be generated by the
propeller. Do not start the engine with the throttle set to a high-speed position. This is very dangerous.
The following can cause failures.
Do not use this module set in combination with other manufacturers products such as servos, gyros etc.
Malfunction can be caused.
As the electronic parts mounted on the transmitter/receiver are susceptible to impact, do not
apply strong impact or drop it.
Out-of-control and dangerous situations can be caused.
When degraded servo movement is detected, stop operating immediately and check the
battery voltage and capacity, servos, etc.
• Where transceiver interference exists. • When there is traffic of cars and motorbikes passing nearby.
• Near high-tension electric lines, buildings, banks, or in mountainous areas, etc. • Near residences and
buildings, and near people. • Near a FM/TV station or a radio transmitting station for ship radio.
A sudden malfunction may occur and it may be dangerous.
Even if the receiver, servo etc. has been submerged and operates normally after it is fully dried,
the servo may malfunction. In such a case, do not continue to use the product, and contact us
for inspection regardless of the normal operation.
Before use, check the following items for safety:
●Is there enough battery voltage for both the transmitter and the receiver?
●Is there any fuel spillage on the receiver, servo, etc. that was caused by leakage from the fuel
tank? Is there enough fuel?
●Check that no linkage intereferes with the airplane body. This may cause vibration noise in
the airplane. Also, conduct a vibration test by restraining the model and setting the engine
(motor) to full power, whilst keeping your hands well clear of the propeller. Check that each
control surface moves correctly. For the first flight, choose a safe place, avoid flying at a great
distance and keep the model close to the landing area for several minutes until you are fully
confident that the receiver is operating correctly.
■ For further question or inquiry please contact your local dealer or JR distributor in
your country.
If each antenna is installed in parallel, the receiving
efficiency will be reduced .
RG831B Main Unit
RA01T Side View
▼ Front Face
▲ Rear Face
RG Cable 150
Close up of the connector
Do not use the product in the following places, as there will be a risk of an
out-of-control condition or an accident:
In order to protect against injury to users or third parties, or damage to
property, points that must certainly be observed are shown below.
Wrong Antenna Installation
Coaxial part of the antenna
can be bent however,
do not bend in right angle.
this will damage the
internal antenna wires.
* The remote antenna receives the data
and also feeds back to the transmitter.
Injury due to heat , fire, or electric shock can occur.
(1) The 2.4GHz band is not a frequency exclusively for use with RC airplanes. This
frequency band is in common use with the ISM (industry, science, and medical
care) band which is widely used for short-distance transmissions such as
microwave ovens, wireless LAN, digital cordless phones, audio, gaming devices,
cell phone Bluetooth. Therefore, the response of the 2.4GHz system may be
reduced in urban areas. Further, as it also is used for ham and local area radio
communication for mobile identification, please pay attention to the possible
influences from these. In the event of any adverse radio wave interference on
an existing wireless station, immediately stop emitting radio waves and take
the interference avoidance measures.
(2) At race tracks and airfields, minimize the use of devices that can affect the
transmitter/receiver and be sure to confirm the safety beforehand. Also, always
follow the instructions of the facility staff.
(3) If an aircraft is allowed to pass behind a building, pylon, trees, etc. the radiowave range is blocked, the response may drop, even result in losing control.
Always let aircraft run or fly within a range that you can visually observe.
Strong Reception
The antenna part should be installed
in a perfectly straight condition.
Remote Antenna
Do not use the product on rainy days since it may cause malfunction if water gets inside the electronic
devices. If it must be used, be sure to take waterproof measures.
●Basic Precautions for Safe Use of the 2.4GHz System
Strong Reception
Due to the nature of the 2.4GHz band which has a
strong directionality in its radio waves, the receiving
sensitivity will greatly differ depending on the direction
against the antenna. Since the antenna receives radio
waves from the sides rather than from the tip, please
take adequate care of the antenna direction when
installing the antenna.
The arrows show the receiving direction with regard
to the antenna.
Built-in Antenna
Built-in Antenna
(Sold separately)
●RG831B Receiver Main Unit ●RA01T Remote Antenna
●RG Cable 150 ●Binding Plug
●Operation Manual (This document) To allow safe use, be certain to observe the following points.
About the Sensor Connections
This logo is only included on
products that support the JR
Telemetry System (bi-directional
Product Number:
Receiving System:
Rated Voltage:
Operating Voltage:
Concerning the 2.4GHz Band Characteristics and Receiving Radio Wave
Circuit Board Face
In the case where there are two coaxial antennas in the receiver
main unit, the faces of each antenna should be installed so that
they are at right angles to each other, rather than being parallel.
Note that in order to allow certain and stable communications
to be carried out, it is recommended that each antenna should
be installed with a separation of 30mm or more.
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
sensitivity will be considerably degraded.
In the situation where the antenna has been
Material Frame
attached directly to a shielding material such as
carbon or metal, the receiving sensitivity of the Receiving
installed antenna surface will be considerably
When the antenna is to be installed on this kind
of shielding material, either separate the
antenna as far as possible from the material, or
in the case where the radio wave shielding
material is the aircraft body itself project the
Receiving Sensitivity
antenna outside the aircraft body.
DO NOT bend the antenna tip !
The antenna part (30mm) should be installed re it is
perfectly straight. If bent, stable receiving will not be
* Take care not to damage
the antennas projecting
from the aircraft body.
Receiving Sensitivity
Aircraft body surface made from
shielding material
Method of Binding
■ In order to establish communications with the transmitter, binding (pairing) must certainly be carried out. In this section, an explanation is given of the binding .
First, confirm that the remote antenna is securely connected to
1 the
receiver, then prepare the included binding plug and a fully
charged battery.
When the LEDs of the receiver and the remote antenna stop
4 blinking,
the binding will be completed. After removing the
binding plug, switch off the power of the transmitter and receiver.
★The remote antenna performs
the role of the transmitter of the
telemetry system. Although it is
possible to use the receiver without
the remote antenna , the receiving
sensitivity will be reduced and the
telemetry function can not be used.
* In the case where the LEDs continue to
flash instead of changing to continuous
lighting, repeat the procedure over
again from the beginning.
By inserting the bind plug into the binding terminal of the receiver
and connecting the battery to a spare channel (such as the AUX
channel), the LEDs on the receiver and the remote antenna will begin to flash.
connect the servo and confirm that communications have been
5 Lastly,
established. Note that when carrying out range testing, after setting
(Binding Standby Condition)
Connect the
battery to a
spare channel.
LED Lighting Locations
Binding Terminal
Display the [BIND] Setting Screen in the transmitter System
Setting Mode. * The figure below shows the XG8 screenshot.
[Situation of the XG8]
Binding Output
In the situation where binding is unsuccessful, confirm the following points.
・Is the remaining battery power of the transmitter and receiver adequate?
・Is the remote antenna securely connected?
・Is the distance between the transmitter and receiver too close?
・When the procedure is carried out on the top of a desk or bench that is
made from metal, binding may not be successful.
the transmitter to the reduced power output condition maintain a distance
of approximately 40m from the aircraft
Keep approximately 40m
and move around it to confirm that
away from the aircraft
operation can be carried out from all
* Regarding the operation method for
reducing the transmitter power output,
please read the transmitter operation
Range Test
About the [DMSS] Fail Safe
The fail safe is set using the Fail Safe function on the transmitter.
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