RadioLink RC8X User manual

RC8X
（FHSS, 8-Channel Digital Proportional RC System）
Adaptable to RC Cars/Boats/Robots
Instruction Manual
2022.09

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Contents
1. RC8X Remote Control System ............................................................................................................................. 4
1.1 Safety Precautions .........................................................................................................................................4
1.1.1 Safety Guidelines for Transmitter ................................................................................................ 4
1.1.2 Safety Guidelines for SD Card.......................................................................................................5
1.2 RC8X Introduction .........................................................................................................................................5
1.2.1 Features .................................................................................................................................................5
1.2.2 Specifications ...................................................................................................................................... 6
1.2.3 Package List......................................................................................................................................... 8
1.2.4 Recommended Configuration...................................................................................................... 9
1.2.5 Buttons Introduction ......................................................................................................................10
1.2.6 Nomenclature of Buttons.............................................................................................................11
1.2.7 Icon Introduction .............................................................................................................................12
1.2.8 Preparation before Turn on Transmitter ................................................................................. 13
1.2.9 Transmitter Low Voltage Alarm..................................................................................................16
1.2.10 Compatible Receivers of RC8X.................................................................................................17
1.3 Receiver Introduction ................................................................................................................................ 18
1.3.1 Features of R8FG ............................................................................................................................. 18
1.3.2 Binding ................................................................................................................................................18
1.3.3 Receiver Connection ...................................................................................................................... 19
1.3.4 Signal Mode and Gyro Function of R8FG ...............................................................................23
1.3.5 Installment of Receiver Antenna................................................................................................27
1.3.6 RSSI Testing ....................................................................................................................................... 28
2. RC8X Basic Functions ........................................................................................................................................... 29
2.1 System menu setting ................................................................................................................................. 29
2.1.1 Desktop setting ................................................................................................................................30
2.1.2 System theme setting ....................................................................................................................30
2.1.3 Backlight.............................................................................................................................................32
2.1.4 Sound.................................................................................................................................................. 33
2.1.5 Battery (Transmitter Battery Voltage)......................................................................................36
2.1.6 Vibration setting..............................................................................................................................38
2.1.7 LED setting .........................................................................................................................................39
2.1.8 HOME button setting .................................................................................................................... 40
2.1.9 External input output.....................................................................................................................40
2.1.10 Calibration .......................................................................................................................................42
2.2 Tools menu .................................................................................................................................................... 44
2.2.1 Trim/Dial select ................................................................................................................................ 44
2.2.2 Switch select ......................................................................................................................................48

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2.2.3 Screenshot setting .......................................................................................................................... 54
2.2.4 Timer....................................................................................................................................................58
2.2.5 Lap list ................................................................................................................................................. 60
2.2.6 Roll out chart .................................................................................................................................... 61
2.2.7 Gear ratio chart ................................................................................................................................62
2.3 Basic menu.................................................................................................................................................... 63
2.3.1 Receiver select ..................................................................................................................................63
2.3.2 Child ID mode .................................................................................................................................. 64
2.3.3 Servo view ..........................................................................................................................................65
2.3.4 Throttle mode (Trigger) .................................................................................................................66
2.3.5 Channel reverse ............................................................................................................................... 69
2.3.6 Sub trim .............................................................................................................................................. 70
2.3.7 End point (EPA)................................................................................................................................ 71
2.3.8 Fail-safe ...............................................................................................................................................72
2.3.9 Acceleration ...................................................................................................................................... 73
2.3.10 Condition ......................................................................................................................................... 74
2.3.11 Idle up...............................................................................................................................................75
2.3.12 D/R, ATL............................................................................................................................................76
2.3.13 Channel limiter .............................................................................................................................. 78
2.3.14 Channel setting ............................................................................................................................. 79
2.4 Telemetry menu...........................................................................................................................................81
2.4.1 Sensor list ...........................................................................................................................................81
2.4.2 Sensor setting ...................................................................................................................................81
2.4.3 Voice.....................................................................................................................................................84
2.5 Racing curve ................................................................................................................................................. 85
2.5.1 Steering curve ...................................................................................................................................85
2.5.2 Throttle curve ................................................................................................................................... 88
2.5.3 Brake curve........................................................................................................................................91
2.5.4 Steering speed..................................................................................................................................92
2.5.5 Throttle speed.................................................................................................................................. 94
2.5.6 Traction control (T.R.C).................................................................................................................. 98
2.5.7 A.B.S ...................................................................................................................................................100
2.5.8 Start ................................................................................................................................................... 103
2.5.9 Engine cut ........................................................................................................................................105
2.6 Mixing menu.............................................................................................................................................. 107
2.6.1 Steering mixing ..............................................................................................................................107
2.6.2 Brake mixing ...................................................................................................................................109
2.6.3 Gyro mixing .....................................................................................................................................111
2.6.4 4WS mixing.....................................................................................................................................114

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2.6.5 Dual ESC mixing ............................................................................................................................ 116
2.6.6 CPS mixing ...................................................................................................................................... 119
2.6.7 Tank mixing .....................................................................................................................................121
2.6.8 Programmable mixing ................................................................................................................ 123
2.6.9 Tilt mixing........................................................................................................................................126
2.7 Model select ............................................................................................................................................... 129
2.8 SD Card Folder ...........................................................................................................................................131
2.8.1 SD Card Folder Name Introduction ....................................................................................... 131
2.8.2 SD Card Files Copy Methods ....................................................................................................132
2.8.3 Note for SD card content modification ................................................................................137
2.9 Information ................................................................................................................................................. 137
2.9.1 User name....................................................................................................................................... 137
2.9.2 Language ......................................................................................................................................... 137
2.9.3 Reset system settings..................................................................................................................138
2.10 Modifying for Left-hand Use ............................................................................................................. 139
2.10.1 Remove the Wheel.....................................................................................................................139
2.10.2 Remove the Wheel Installation Port Cover.......................................................................140
2.10.3 Install Wheel .................................................................................................................................141
2.10.4 Install the Wheel Installation Port Cover...........................................................................142
2.11 Wheel or Trigger Mechanical Adjustment .................................................................................... 144
2.11.1 Trigger brake lever adjustment ............................................................................................. 144
2.11.2 Trigger tension screw adjustment........................................................................................145
2.11.3 Trigger slide adjustment ..........................................................................................................145
2.11.4 Wheel tension screw adjustment ......................................................................................... 146
2.12 Firmware Update ....................................................................................................................................147
2.12.1 Methods for Firmware Copy.................................................................................................. 147
2.12.2 Methods for Firmware Upgrade ........................................................................................... 147
Thanks .......................................................................................................................................................................... 154

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1. RC8X Remote Control System
1.1 Safety Precautions
1.1.1 Safety Guidelines for Transmitter
1Do not operate outdoors on rainy days, run through puddles of water, or use when
visibility is limited. Should any type of moisture (water or snow) enter any component of the
system, erratic operation and loss of control may occur.
2Do not operate in the places that near people or roads.
3This 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.
4Always ensure the trim levers at 0 and battery properly charged before connecting the
receiver.
5Always check the throttle trigger on the transmitter to be sure it is at the neutral position
before turning on the power switches of transmitter and receiver. Always be sure the engine is
not running or the motor is stopped before turning off the power switches.
6Make sure that turn on the transmitter power switch and then turn on the receiver or
speed control power switch when you ready to operate the model. Make sure that turn off the
receiver or speed control power switch and then turn off the transmitter power switch when you
ready to stop to operate the model. If the power switches are turned on or turned off in the
opposite order, the model may unexpectedly run out of control and cause a very dangerous
situation.
7Before running, check if the function moves the servos to the preset position. Trigger the

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throttle trigger and steering the steering wheel to check if the motor and servo move to the
preset position. When adjusting the model, make sure the engine not running. You may
unexpectedly lose control and create a dangerous situation.
8Never power on the RC8X out of 7.0V~17V. 8 pieces AAA batteries，a 2S~4S LiPo battery
or a 6S Ni-MH battery is permitted.
9Never charge the RC8X with the USB port, the Type-C port on the left of RC8X only for
firmware upgrade.
10 Do not operate this RC system when you are tired, not feeling well or under the
influence of alcohol or drugs. Your judgment is impaired and could result in a dangerous
situation that may cause serious injury to yourself as well as others.
11 Do not touch the engine, motor, speed control or any part of the model that will
generate heat while the model is operating or immediately after its use. These parts may be very
hot and can cause serious burns.
1.1.2 Safety Guidelines for SD Card
Never unplug and plug the Micro SD card when the transmitter turns on, especially the
transmitter is reading the data, or it will damage the SD card or loss of data.
1.2 RC8X Introduction
1.2.1 Features
RC8X, an 8 channels transmitter, has a 4.3 inch, full-color, backlit LCD touch screen. The
screen is translative which enables both indoor and outdoor visibility. The setting page switching

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as same as the mobile phone.
It is packed with the R8FG receiver, with built-in gyro and supports high voltage servo, which
is capable of RSSI, receiver, and model battery voltage telemetry.
RC8X is capable of an arbitrary ID designation among a maximum of 10 binding receivers
and can keep a maximum of 200 pieces model parameters saved.
Setting Menu, font, desktop, system theme, etc., can be customized, you can achieve a
totally unique 8 channels transmitter without one code to modify.
Multiple Programmable Mix Control such as 4WS, 4WD, Tank mixing, Tilt mixing, CPS mixing
etc.
RC8X, with steering curve, throttle curve, brake curve, etc., that is an ideal partner for all
types RC cars and boats in the market including single-engine and twin-engine models such as
Crawlers, Tanks, Caterpillars, Basher, RC Short-Course Truck, RC Crawler, Drifting RC Car, Gasoline
RC Car, Mini RC Car, RC Monster Truck, Off-Road RC Car, GP RC Car, EP RC Car and other types of
RC cars or boats.
1.2.2 Specifications
RC8X Transmitter
Dimensions
L*W*H: 121*163*109mm(4.76”*6.42”*4.29”)
Weight
438.5g(15.47oz)
Model Types
Car (Including Crawlers/Tanks/Caterpillars)/Boat/Robot
Channels
8 channels

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Screen
4.3 inches, full-color, backlit LCD touch screen
Control Distance
Ground 600 meters(1968.5ft) (Maximum range tested in
unobstructed areas free of interference)
Operating Current
290mA ± 10mA@8.4V(the LCD screen light on); 200mA ±
[email protected](the LCD screen light off)
Operating Voltage
7～17V DC (8 pieces of AAA batteries or a 2S-4S LiPo battery or a
6S Ni-MH battery)
Antenna
Built-in Antenna
Frequencies Band
2.4GHz ISM ISM band (2400MHz~2483.5MHz)
Modulation Mode
GFSK
Transmission Power
<20dbm
Spread Spectrum
FHSS, 67 channels pseudo random frequency hopping
Channel Resolution
4096 with regular jitter of 0.5us
Low Voltage Alarm
low transmitter voltage, low receiver voltage, low model battery
voltage or low RSSI alarm can be customized
Dimension of Battery
Case
L*W*H =92*52*14.5mm(3.62”*2.05”*0.57”)
Model Memory
200 models
Compatible Receiver
R8FG (Std), R7FG, R6FG, R6F, R8EF, R8F, R8FM, R8SM, R8XM, R4F,
R4FGM
Voice Broadcast
Yes
R8FG Receiver

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1.2.3 Package List
Dimensions
L*W*H =35*20*13mm (1.38”*0.79”*0.51”)
Weight
7g(0.25oz)
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
Compatible
Transmitter
RC8X, RC6GS V3, RC6GS V2, RC6GS, RC4GS V3, RC4GS V2, RC4GS,
T8FB, T8S
EXT Connect Cable×1 Type-C Cable(for Upgrade) Manual×1 Packing Box×1
RC8XTransmitter×1 R8FGreceiver×1 4G SD Card×1 Lanyard×1

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1.2.4 Recommended Configuration
The below accessories sold separately. You can enter the AliExpress Official Store to purchase.
Or login to the Radiolink official website www.radiolink.com for product details.
FPV monitor holder R7FG Receiver with Gyro Built-in R6FG Receiver with Gyro Built-in
R6F Receiver support R8F Receiver 2-way Transmission R4FGM mini–Receiver
R4F mini-Receiver

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1.2.5 Buttons Introduction

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1.2.6 Nomenclature of Buttons
Switch/Knob
Full name
Function
Operation
DT1
Digital Trim 1
default steering trim
Push the button forward to
increase the value and press
backward the button to
decrease the value. Restoration
to factory settings by push the
buttons moving to the left
horizontal direction.
DT2
Digital Trim 2
default throttle trim
DT3
Digital Trim 3
Default dual rate
DT4
Digital Trim 4
Default brake1 rate
(ATL*)
DL1
Digital Dial 1
Code switch, Gyro gain
PS1
Push Switch 1
Default control CH4, can
be programmed
Self-locking switch or trigger
switch can be programmed

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PS2
Push Switch 2
Default control CH6, can
be programmed
PS3
Push Switch 3
Default press PS3 to turn
on or turn off backlight,
can be programmed
PS4
Push Switch 4
Default control CH7, can
be programmed
PS5
Push Switch 5
Default control CH5, can
be programmed
VR
Knob switch
Dial, default control CH3,
can be programmed
HOME
Power switch/Switch for
quick back to homepage
ATL
Adjust Throttle
Low
Default brake rate
1.2.7 Icon Introduction
Into Setting Menu
Mixing Menu
System Menu
Model Select Menu
Tools Menu
SD Card Folder
Basic Menu
Transmitter Version Information
Telemetry Menu
Back To Previous Menu
Racing Curve Menu
User Saved Menu

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1.2.8 Preparation before Turn on Transmitter
1.2.8.1 Power for Transmitter
RC8X is easily adapted for various battery layouts with wide operating voltage of 7.2V to 17V,
which can use 8 pieces of AAA batteries, a 6S Ni-MH battery or a 2S-4S LiPo battery. Universal
JST connector with the voltage protection software of Radiolink ensures vital components are
protected from a reverse polarity connection.
1) AAA Battery
① remove the battery cover from the transmitter by sliding
it in the direction of the arrow follow the picture at right.
② load 8 pieces new AAA batteries. Pay attention to the
polarity markings.
③ make sure the 8 pieces AAA batteries are not loose.
④ Slide the battery cover back onto the case.
2）LiPo Battery
① remove the battery cover from the
transmitter by sliding it in the direction of the
arrow follow the picture at right.
② remove the battery box.
③ plus a LiPo batteries. Pay attention to the
polarity markings.

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④ Slide the battery cover back onto the case.
Attention: if your RC8X have plug battery already, but still cannot turn on, please check
below:
① check if the AAA batteries have reverse polarity connection.
② check if the battery box has reverse polarity connection.
③ check if the LiPo battery has reverse polarity connection.
④ check if the AAA batteries have fully charged.
1.2.8.2 Turn on Transmitter
Long press HOME button about 1.5 seconds, the RC8X will shows Radiolink Logo, and the
welcome to Radiolink sound is emitted at the same time, the home page will display this
information as the picture below:
1The current model name. There are 100 models in total can be select in Model select
menu. Make sure the model’s name on the display is consistent with the actual model before
running. If the model’s name is not consistent with the actual model, the movement of servo,
the steering gear’s action, the neutral position setting will be wrong, it may be damaging the
car.
2Receiver signal strength. Receiver signal strength will display on the top of the
transmitter screen after the transmitter bind success with the receiver.
3The battery voltage of transmitter.

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4Servo operation from CH1 to CH8. Real-time bar-graph display to demonstrate exactly
what commands the transmitter is sending to
the servos.
5Mixing function. The background
color of functional block will turn to blue if
the mixing function corresponding turn on
while the background color of functional
block will turn to grey if the mixing function
corresponding turn off.
6T1：Total timer. It is used to record the
total uptime of the transmitter. Turn off the
transmitter will not affect time accumulation.
T2：Click to time. Click the T2 timer
functional block to start to time, stop to time or reset. Click once to start to time, click twice to
stop to time, click thrice to reset.
The timer set steps can follow: 2.3.4 Timer
7Telemetry.
RX：the current input voltage of receiver.
EXT：the current input voltage of cars or boat.
RSSI：the receiver signal strength, “NULL” indicate loss of signal or the transmitter and the
receiver failed to bind. The RSSI is 0 to 30dBm is normal when the transmitter is apart
about 50 centimeters from the receiver, the signal is better the RSSI data is closer to 0. The

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RSSI test steps can follow: 1.3.6 RSSI Testing
8Button name and its function name and state. The function and value represented by
DT1/DT2/DT3/DT4/DL1 can be checked on the home page.
9Into setting menu. Into all the parameter setting menu by press this button.
10 Into user saved menu. Click this button to select the setting menu that you have save, it
very convenient to help users to find the frequently used functions immediately.
1.2.8.3 Language Select
The language of RC8X is default English, language can be changed in Information Menu.
Setting Steps: turn on your RC8X, click the button
at the left bottom of RC8X into System menu,
click at the left of RC8X into Information menu, ,
click the blue select box below the word Language,
“Chinese/English” can be chosen.
Back: click the button or short press the
power button to return to the previous menu.
1.2.9 Transmitter Low Voltage Alarm
Transmitter low battery voltage alarm is default 6.8V, if the voltage of transmitter battery is
lower than 6.8V, the transmitter will alarm with sound “transmitter voltage low”, please change
the battery when you heard the alarm, the value of low transmitter battery voltage alarm can be
set in the battery menu according to your battery that powered for your RC8X.

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Setting steps: turn on your RC8X, click the button at the left bottom of RC8X into
System menu, click at the left of RC8X into
Information menu, click Battery, click the blue select box at
the right of Alarm voltage to change the alarm value, click
“-“ to reduce the number and click “+” to increase the
number. If you use a 2S LiPo battery to power for your RC8X,
then the alarm voltage number do not lower than
3.7V*2S=7.4V, 3S LiPo battery do not lower than 11.1V, 4S
LiPo battery do not lower than 14.8V.
Reset: click Reset will make the alarm voltage number back to 6.8V.
Back: click the button or short press the power button to return to the previous menu.
Attention: the other parameter setting steps in the Battery menu can follow: 2.1.5 Battery
(Transmitter Battery Voltage)
1.2.10 Compatible Receivers of RC8X
RC8X is packed with a R8FG receiver by default. RC8X is also compatible with 8 channels
receiver R8F capable of real-time transmission of RSSI, receiver, and model voltage. 7 channels
receiver R7FG, which with gyro integrated. 6 channels receiver R6FG, which with gyro integrated,
R6F with HV servo supported. 4 channels super micro receiver R4FGM with gyro integrated, R4F
with HV servo supported.
Note ： Since RadioLink radio control systems are not open sourced, that RadioLink
transmitters are ONLY compatible with RadioLink receivers and RadioLink receivers are ONLY
compatible with RadioLink transmitters.

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1.3 Receiver Introduction
1.3.1 Features of R8FG
RC8X, packed with a R8FG, 2.4GHz 8 channels receiver, gyro integrated and high voltage
servo supported.
FHSS spread spectrum algorithm and 67-channel pseudo-random frequency hopping make
the R8FG get excellent anti-interference performance, perfect for multiplayer complete
synchronously.
R8FG also support PWM, SBUS, PPM signals output.
R8FG is default turn off the gyro function (Green LED), if need to turn on the gyro function,
please follow the setting steps: 1.3.4 Signal Mode and Gyro Function of R8FG
1.3.2 Binding
RC8X and R8FG have finished binding by default. So it’s unnecessary to rebind when you
received the new RC8X. Turn on the RC8X and the R8FG, the signal tower will show on the top of
the screen as the picture below, it means the transmitter and receiver have get ready to connect
the ESC, servo, motor, and other equipment that you are prepared for your car or boat.
But if you buy a new R8FG or another receiver for your RC8X, rebind is necessary.
Make sure the transmitter and the receiver have bind success before you are going to
operate the transmitter, 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.

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Binding steps:
① Put the transmitter and the receiver close to each other
(about 50 centimeters).
② Turn on both the transmitter and the receiver, and then
the LED of R8FG will start flashing slowly.
③ There is a black binding button (ID SET) on the side of
receiver. Press the button for more than 1 second and release, the LED will flash quickly, indicate
binding process is ongoing.
④ When the LED stops flashing and is always on, binding is complete and there will be a signal
tower shown on top of the LCD screen of the transmitter. If not succeed, the LED will keep
flashing slowly to notify, repeat the above steps.
⑤ Note: NO gyro by default as factory setting. Since integrated gyro in R8FG will self-check, it is
very important to remain R8FG still when powering it on. green LED (always on) indicates normal
working mode while green+red LEDs (always on) indicate gyro working mode. When RED is off
means NO gyro. If binding is not successful, the green LED will keep flashing to notify.
1.3.3 Receiver Connection
1.3.3.1 Connect Cable
The connection wire for receiver is shown in the picture above. The common ones are