RadioLink R8FG User manual

R8FG
(FHSS)
INSTRUCTION MANUAL
Two-way Transmission
PWM&PPM&SBUS Signal Supported
8-channel Receiver with Integrated Gyro

RadioLink Electronic Ltd
www.radiolink.com
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Thanks for purchasing RadioLink 8-channel dual antenna receiver R8FG.
To fully enjoy the benefits of this product and ensure safety, please read the introduction carefully
and set up the device as instructed steps.
If any problems found during the operation process, either way listed below can be used as online
tech support.
1. Send mails to [e-mail] and we will answer your question at the earliest.
2. Send private message to us on our Facebook page or leave comments on our YouTube page
3. If the product is purchased from the local distributor, you can also ask them for support and repair
as prefer.
All manuals and firmwares are available on RadioLink official website www.radiolink.com and more
tutorials are uploaded. Or follow our Facebook and YouTube homepage to stay tuned with our latest
news.
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SAFETY PRECAUTIONS
Never operate your model during adverse weather conditions. Poor visibility can cause
disorientation and loss of control of your model.
Never use this product in a crowd and illegal area.
Always ensure the trim levers at 0 and battery properly charged before connecting the receiver.
Always check all servos and their connections prior to each run.
Always be sure about turning off the receiver before the transmitter.
WARNING
This product is not a toy and is NOT suitable for children under the age of 14. Adults should keep the
product out of the reach of children and exercise caution when operating this product in the presence of
children.
Water or moisture may enter the transmitter inside through gaps in the antenna or joystick and cause
model instability, even out of control. If running in the wet weather(such as game) is inevitable, always
use plastic bags or waterproof cloth to cover the transmitter.

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Contents
1. R8FG Introduction ................................................................................................................................... 3
1.1 Compatible transmitters .................................................................................................................3
1.2 Binding ........................................................................................................................................... 3
2. Telemetry ................................................................................................................................................. 3
2.1 Telemetry of Signal and RSSI ........................................................................................................4
2.2 Telemetry of model battery and receiver voltage ...........................................................................5
3. Child ID .................................................................................................................................................... 6
4. Working Modes ........................................................................................................................................7
4.1 Working mode setting .................................................................................................................... 8
4.2 LED Indicator Color in Different Working Modes ...........................................................................8
5. Gyro Introduction ..................................................................................................................................... 8
5.1 Gyro Function ................................................................................................................................ 8
5.2 Gyro Enable ................................................................................................................................... 8
5.3 Gyro Reverse .................................................................................................................................8
5.4 Gyro Sensitivity Adjustment ........................................................................................................... 9
6. R8FG Specifications ................................................................................................................................9
7. Note of Antenna Installation .................................................................................................................... 9

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1. R8FG Introduction
1.1 Compatible transmitters
RadioLink R8FG 2.4G 8-channel receiver, splash-proof, with integrated gyro for professional car drifting
and high voltage servo supported is compatible with RadioLink RC8X/RC6GS V3/RC6GS V2/RC6GS/
RC4GS V3/RC4GS V2/RC4GS/ RC3S/RC4G/T8FB/T8S.
1.2 Binding
Each receiver has an individual ID code and must bind with transmitter before using. When the binding is
done, the ID code will be stored in the transmitter and there’s no need to rebind. Therefore, when a new
R8FG is purchased, binding needs to be done in order to work with transmitter.
Binding steps:
①Put the transmitter and the receiver close to each other (about 60 centimeters). Note: The close
distance between the transmitter and receiver may cause a signal block, which leads to unsuccessful
binding or signal loss.
②Turn on both the transmitter and the receiver, and then the LED of R8FG will start flashing slowly.
③There is a black binding button (ID SET) on the side of the receiver. Press the button for more than 1
second and release, the LED will flash quickly, indicating the binding process is ongoing.
④When the LED stops flashing and is always on, binding is complete and there will be a signal tower
shown on top of the IPS screen of the transmitter(As shown above). If not successful, the LED will keep
flashing slowly to notify, repeat the above steps.
Note: When the transmitter and receiver are powered on, if binding is not successful or the signal is lost,
the LED of R8FG will keep flashing to notify.
2. Telemetry
R8FG can return the real-time flight information such as RSSI, receiver voltage and model battery
voltage.

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In order to enjoy this function, please upgrade RC6GS(3-position switch version) with the firmware
RC6GS_RadioLink_bin_1d15_V_6_1_2 downloaded via https://www.radiolink.com/rc6gs_firmware
Or upgrade RC4GS(produced after 2018-01-01) with the firmware
RC4GS_RX_RadioLink_bin_2f50_V_6_0_1 downloaded via https://www.radiolink.com/rc4gs_firmware
If you are using RC8X, RC6GS V3, RC6GS V2, RC4GS V3 or RC4GS V2, the default firmware supports
telemetry function.
Power on RC8X and R8FG receiver. The signal and other telemetry information will be displayed in the
home page of RC8X if the binding is successful and the telemetry cable is connected correctly.
RC8X home page:
2.1 Telemetry of Signal and RSSI
Power on RC8X and R8FG receiver, and then bind them. Signal and RSSI will be displayed on the
homepage of transmitter after successful binding.

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RC8X home page:
Warning can be set with a certain low RSSI value after testing by changing distance. Enter Telemetry
setting--Receiver signal to set the RSSI warning value, alarm sound type etc..
Note: R8FG is the receiver with dual antenna. When the distance between the transmitter and the R8FG
is 60 centimeters, it is normal that RSSI value is within the range of 0 to -30dBm. The closer the value is
to 0, the stronger the signal is. The range of RSSI value of RadioLink transmitters is from 0 to -99dBm.
The larger the absolute value of the RSSI value is, the weaker the signal is. For example, the signal when
the RSSI value is -90dBm is weaker than the signal when the RSSI value is -75dBm.
2.2 Telemetry of model battery and receiver voltage
Besides the return of receiver voltage, model battery voltage (maximum up to 8S lithium battery, 33.6V)
can also be returned in real time. Users can personalize the warning value of low model battery voltage
depending on the actual needs Enter Telemetry setting-- Engine battery voltage to set the alarm voltage,
alarm sound type etc.. Normally we set the warning value with the single cell voltage as 3.7V. For
example, if it is 3S lithium battery used in the model car, the warning value should be set as （3.7V*3S=）
11.1V.

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Model battery voltage return can be easily achieved by connecting the male end of the battery wire to
ESC while the female end to the battery and the wire with a JST head connects Telemetry (+-) port of
R8FG/R7FG/R8F as below pic shown. No extra module is needed.
Attention:
1. Reverse polarity protection circuit design for all 8 channels of R8FG ensures vital components are
protected from a reverse polarity connection. But, the JST connector which is packed with R8FG for
connecting to the battery cannot reverse polarity connect, or it will lead to the wrong voltage value
telemetry.
2. Telemetry port is only used to model voltage telemetry. It can not be used to power the receiver.
3. Child ID
RC8X can bind with multiple receivers. When RC8X and multiple receivers have been bound successfully,
and RC8X and all successfully paired devices are turned on at the same time. There are two ways to use
them:
1. When Child ID function is turned off, RC8X can control multiple devices at the same time.
2. When Child ID function is turned on, RC8X can control the specified device according to the selected
Child ID. RC8X has 16 groups of Child ID functions, and each ID corresponds to a receiver. Set the Child

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ID first. When all the devices are turned on, you can control one of the devices through the Child ID
function. At this time, the other devices are on standby.
For example: Bind RC8X with a truck and a car and turn all them on. First, use RC8X to control the
car to run to the bucket of the truck, and then switch the receiver ID on the truck to drag the car back to
the destination.
Child ID mode setting steps:
1. Tap the button at the right of the "Child ID mode" to change it from "OFF" to "ON". Set the ID number
according to your cars or boats and then finish the bind and parameters set for each receiver.
2. Once finished the Child ID mode setting, the corresponding ID number will be displayed on the main
interface of RC8X. (For example: ID_1) Change the ID number by click "-" or "+", click Reset will make
the ID number back to ID_0.
4. Working Modes
R8FG has a built-in gyroscope, which can output not only PWM signals but also PPM and SBUS signals.
There are four working modes, including ordinary PWM mode, SBUS mode, Gyro mode, and Gyro +
SBUS mode. The channel signal corresponding to each mode is as follows:
R8FG Working Mode
Working Mode
PWM Mode
SBUS Mode
Gyro mode
Gyro+SBUS
Mode
Note
Channel
Telemetry
Telemetry Port of Model Battery Voltage（+ -）
TELEMETRY port is only for 2S-8S battery voltage telemetry. The port
cannot be used to power the receiver.
1
PWM
PWM
PWM
PWM
Steering
2
PWM
PWM
PWM
PWM
Throttle
3
PWM
PWM
PWM
PWM
Aux
4
PWM
PWM
PWM
PWM
Aux
5
PWM
PWM
PWM
PWM
Aux
6
PWM
PWM
PWM
PWM
Aux
7/PPM
PWM
PPM
PWM
PPM
Aux
8/S.BUS
PWM
S.BUS
PWM
S.BUS
Aux

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4.1 Working mode setting
Turn on/off the gyro: Short press the binding button 3 times within 2 seconds to switch the gyro on and
off, and the color of the LED indicator will switch accordingly
Gyro phase switch: Short press the binding button twice within 2 seconds to switch the gyro phase.
Turning on/off the SBUS: short press the binding button once to turn on/off the SBUS, and the color of
the LED indicator will switch accordingly. After SBUS signal is enabled, channel 1-6 output PWM;
channel 7 outputs the PPM signal, and channel 8 outputs the SBUS signal.
4.2 LED Indicator Color in Different Working Modes
Working Mode
PWM Mode
Gyro mode
SBUS Mode
Gyro + SBUS Mode
Indicator Color
Green
Red
Blue
Red+Blue
Note: When the receiver is connected to the power supply, if there is no successful binding between the
receiver and the transmitter or the receiver loses the signal, the indicator of the receiver will flash slowly.
5. Gyro Introduction
5.1 Gyro Function
R8FG has a built-in gyroscope. The integrated high-performance gyro adopts the software filter and PID
algorithm, timely and precisely corrects the sensitivity and improves the stability. Its good flexibility to
different models easily achieves professional performance even with drift cars.
5.2 Gyro Enable
The gyro function of R8FG is turned off by default. Since the integrated gyro in R8FG will self-check, it is
important to keep R8FG still when powering it on. Red LED is the gyro status indicator . When the red
LED off means NO gyro. Press the binding button three times (intervals of less than 1 second), the red
LED will flash three times, indicating that gyro is enabled.
Attention: It's normal that the servo keeps shaking when connected to the receiver. Because the gyro is
helping to correct the steering gear angle of the servo automatically if the gyro function has turned on,
you can turn off the gyro function if you do not need this function.
If the receiver has not to be moved, but the servo keep shaking, there are two reasons below:
①The servo has connected to the PPM/S.BUS channel of the receiver. Please reconnect the servo to
the CH1/2/3/4/5/6, because the standard servo only supports PWM signal input.
②The gyro is too much sensitive. Please turn DL1 switch to reduce the gyro sensitivity.
5.3 Gyro Reverse
Set the gyro forward, and turn the car right or left to see whether the gyro functions. The wheel will turn
left when the car is turned right and the wheel turns right when the car is turned left. If the gyro acts
counter, press the binding button twice, the red LED flashes twice, the gyro reverse is corrected.

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5.4 Gyro Sensitivity Adjustment
Gyro sensitivity is defaulted to adjust by channel eight that default controlled by DL1/PS3 knob switch,
turning the DL1/PS3 knob switch clockwise to increase sensitivity and anti-clockwise to reduce it. When
turning the DL1/PS3 knob switch, a tooltip with yellow background color will pop out at the top of the
screen, and the value of the channel will be changing at the same time, the value is closer to +100, the
higher sensitivity. If the value is 0, it means the gyro function has been turned off.
You can also assign other switches to control the gyro function or adjust the sensitivity on this page.
6. R8FG Specifications
7. Note of Antenna Installation
In order to maximize the signal transmission, it’s greatly advised that
1. Keep antennas as straight as possible, or the effective control range will reduce.
2. Keep the two antenna in 90° angle as shown below
R8FG Receiver
Dimensions
L*W*H =35*24*13.5mm (1.38"*0.94"*0.53")
Weight
10.5g(0.37oz)
Channel
8 channels
Control Distance
Ground 600 meters (1968.5ft) (Maximum range tested in unobstructed areas
free of interference)
Operating Current
30mA
Operating Voltage
3-12V
Signal Output
SBUS&PPM&PWM
Telemetry
Real-time built-in telemetry of model battery voltage, RSSI, and receiver
voltage
Water Splash Proof
The waterproof grade is IPX4
Gyro
Receiver with gyro integrated, customizable gyro sensitivity
Compatible
Transmitter
RC8X, RC6GS V3, RC6GS V2, RC6GS, RC4GS V3, RC4GS V2, RC4GS,
T8FB, T8S

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3. Big models may contain metal parts that influence signal emission. In this case. antennas should be
positioned at both sides of the model to ensure the best signal status in all circumstances.
4. Antennas should be kept away from metal conductor and carbon fiber at least half inch away and no
over bending.
5. Keep antennas away from motor, ESC or other possible interference sources.
6. Sponge or foam material is advised to use to prevent vibration when installing receiver.
7. Receiver contains some electronic components of high-precision. Be careful to avoid strong vibration
and high temperature.
8. Special vibration-proof material for R/C like foam or rubber cloth is used to pack to protect receiver.
Keeping the receiver in a well sealed plastic bag can avoid humidity and dust, which would possibly make
the receiver out of control.
When all the above steps are complete, please turn off the transmitter and repower on to test if the
receiver is correctly bind with it.
Thank you again for choosing RadioLink product.