RadioLink T8S User manual

Radiolink Electronic Ltd
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T8S
（FHSS）
8-Channel Remote Controller
Instruction Manual
Compatible with Fixed-wings/Gliders/Multirotors/Cars/Boats
* Please be kindly noted that this manual will be updated regularly and please visit
Radiolink official website to download the latest version.

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Thanks for purchasing Radiolink 8-channel remote controller T8S.
To fully enjoy the benefits of this product and ensure safety, please read the introduction carefully
and set up the device as described below:
If any problems found during the operation process, please kindly refer to the manual first. Then pilots
could contact our distributors to find solution or follow our Facebook homepage
https://www.facebook.com/Radiolink-1455452961436694/ to search related key words. Also pilots can
send questions to [e-mail] or [e-mail] and we will
answer your question at the earliest.
Due to unforeseen changes in production procedures, the information contained in this manual is
subject to change without notice.
For more information please check our website http://www.radiolink.com and follow our Facebook
and youtube homepage.
SAFETY PRECAUTIONS
Never operate models during adverse weather conditions. Poor visibility can cause disorientation
and loss of control of pilots’model.
Never use this product in a crowd or illegal areas.
Always check all servos and their connections prior to each run.
Always be sure about turning off the receiver before the transmitter.
To ensure the best radio communication, please enjoy the flight/driving at the space without
interference such as high voltage cable, communication base station or lauching tower.
WARNING
This product is not a toy and is NOT suitable for children under the age of 18. 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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Content
Chapter 1 Introduction of T8S....................................................................................................................................... 2
1.1 Installation of Remote Control................................................................................................................................2
1.1.1 Installation Receiver Antenna......................................................................................................................2
1.1.2 Transmitter Battery Charging...................................................................................................................... 2
1.2 T8S Basic Setup........................................................................................................................................................... 2
1.2.1 Compatible Receivers.................................................................................................................................... 2
1.2.2 Binding...............................................................................................................................................................4
1.2.3 Signal Switch between SBUS&PPM and PWM .....................................................................................4
1.2.4 T8S Calibration................................................................................................................................................ 5
Chapter 2 Firmware Upgrade.........................................................................................................................................5
Chapter 3 Parameters Setup via Mobile..................................................................................................................... 8
3.1 Android APP Installation........................................................................................................................................8
3.2 Connection................................................................................................................................................................ 8
3.3 Parameters Setup Menu........................................................................................................................................ 9
3.3.1 SERVO Menu..................................................................................................................................................10
3.3.2 BASIC Menu................................................................................................................................................... 11
3.3.3 ADVANCED Menu........................................................................................................................................ 12
3.3.4 SYSTEM Menu............................................................................................................................................... 13
Chapter 4 T8S Parameters Setup via Computer.................................................................................................. 14
4.1 Software Installation and Connection................................................................................................................ 14
4.2 Parameters Setup Menu.........................................................................................................................................15
4.2.1 BASIC Menu................................................................................................................................................... 15
4.2.2 ADVANCE Menu............................................................................................................................................16
4.3 Parameters Save in T8S.......................................................................................................................................... 16
Chapter 5 FAQ Shooting............................................................................................................................................ 17

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Chapter 1 Introduction of T8S
As image of T8S (Mode 2) shown below, there are two 3-way switches, one toggle-switch, one
push-button, eight trimmer buttons and two joysticks. The Mode can be personalized to 1(throttle on
right hand) or 2 (throttle on left hand) or both sticks return to center points with the small accessory
packed in the bag.
Factory setting by default: CH5/3-way switch on the right, CH6/ Push-button, CH7/3-way switch
on the left, CH8/toggle-switch.

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1.1 Installation of Remote Control
1.1.1 Installation of Receiver Antenna
1. Keep antennas as straight as possible, or the effective control range will reduce.
2. 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.
3. Antennas should be kept away from metal conductor and carbon fiber at least half inch away and no
over bending.
4. Keep antennas away from motor, ESC or other possible interference sources.
5. Sponge or foam material is advised to use to prevent vibration when installing receiver.
6. Receiver contains some electronic components of high-precision. Be careful to avoid strong
vibration and high temperature.
7. 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 connected with it.
1.1.2 T8S Battery Charging
The built-in battery of T8S is 1S lithium. When the voltage becomes low, the green indicator will flash
with a DD warning tone. Make sure to charge the battery in time to avoid the possible damage by over
discharge.
T8S charging is as simple as only an android USB cable needed, connecting to the computer or
portable charger.
1.2 Basic Setup
1.2.1 Compatible Receivers
The standard receiver equipped to T8S is R8EF, 2.4G 8-channel receiver with SBUS,PPM and PWM
signal output supported. R8FM is another compatible receiver with extreme light weight of 2.5g and
double signal output of SBUS and PPM. The control distance of both receiver is up to 2000 meters.
R8EF Parameters
1) Channel Qty: 8
2) Operating Voltage：4.8-10V
3) Operating Current：30mA
（Input Voltahe 5V）
4) Dimension : 48.5*21*11mm
5) Weight：7g

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6) 2048 section precision, 0.5us per section, servo anti-shake rudder.
7) Distance: 2000m in the air (depending on the actual flight circumstances)
Signal Working Mode
(1) PWM Working Mode: Receiver indicator is RED with all 8 channels output PWM signal.
(2) SBUS/PPM Working Mode
Receiver indicator is Blue(Purple) with 8 channels output in total. Channel 1 is SBUS signal, channel 2
PPM signal and channel 3 to 8 PWM signal.

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R8FM Parameters
1) Channel Qty: 8
2) Operating Voltage：4.8-6V
3) Operating Current：30mA（Input Voltage 5V）
4) Dimension：16.0*21.5*1.0mm
5) Weight：2.5g
6) 2048 section precision, 0.5us per section, servo anti-shake rudder.
7) Distance: 2000m in the air (depending on the actual flight circumstances)
Signal Working Mode
8 channels output of SBUS or PPM signal.
When the indicator is BLUE, the output of 8 channels is SBUS
When the indicator is RED, the output of 8 channels is PPM.
1.2.2 Binding
Every transmitter owns a unique ID code. Before using, binding transmitter to receiver on aircraft is
a must. When done binding, ID code will be stored in the receiver, no need to rebind, unless the
receiver is going to work with another transmitter. If a new R8EF or R8FM receiver is purchased, binding
needs to be done before using.
Binding steps of all transmitters and receivers from RadioLink are the same as follow:
（1） Put the transmitter and the receiver together within 1 meter.
（2） Power on the transmitter and the receiver. The receiver will bind to the closest transmitter.
（3） Press the ID SET on the side of the receiver for more than 1s, the flashing LED means binding
starts. When LED is always on (stops flashing), binding is complete.
（4）Check if servos move as the transmitter commands to verify the binding success.
1.2.3 Signal Switch between SBUS&PPM and PWM
R8EF: Short press the ID SET on the receiver twice within 1s to switch the SBUS/PPM signal to PWM
signal. When the RED LED is on, PWM signal is output while SBUS/PPM signal is output when both RED
and BLUE leds are on.
R8FM: Short press the ID SET on the receiver twice within 1s to switch the SBUS to PPM signal. When
the RED LED is on, PPM signal is output while SBUS signal is output when both RED and BLUE leds are
on.

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1.2.4 T8S Calibration
When the transmitter is power-off, toggle both sticks at the central point. Then press the first trimmer
button on the left (with an arrow to left) and the power button simultaneously, the four green
indicators will start flashing and the T8S is ready to be calibrated.。
Range Calibration: Toggle both sticks (Ch1-4) to the highest point/maximum and the lowest
point/minimum. Then back to the central point. (Refer to image below)
Central Point Calibration: When the sticks are back to the central point, press the second trimmer
button on the left (with an arrow to right). Two short DD sounds will be heard while the first green
indicator is always on, meaning the stick calibration is complete.
Chapter 2 Firmware Upgrade
T8S can be upgraded with latest functions added, keeping advanced as always.
The function of data backup makes massive copy possible, Even the same model can directly copy data.
Set parameters once, copy at ease!
The whole file with all necessary tools can be download via
https://mega.nz/#F!sVESQSwR!65d0382IOAXwMz2uHcPZCg

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1. Driver Installation: Select the correct driver depending on the computer system.
2. Open the software to upgrade T8S firmware
3. Connect T8S with computer via a USB cable
4. Choose the correct port
5. Click CONNECT and press the power button once quickly within 1s

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6. When “DISCONNECT” in red turns to “CONNECT” in green, it means it’s connected with success.
7. Click“APROM” and choose the latest firmware T8FB&T8S_FHSS_V301_dc66_20180912_33bit.hex
8. Click “START” and the process bar becomes green. When the green bar goes to the end and shows
PASS, the firmware is upgraded with success.

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Chapter 3 Parameters Setup via Mobile
3.1 Android APP Installation
Scan the QR code on the right or choose the file RadiolinkT8FB/T8S.APK
in the zip file downloaded via
https://mega.nz/#F!sVESQSwR!65d0382IOAXwMz2uHcPZCg
and install into an Android phone.
Note The version of T8S parameters setup APP is only available on
Android mobiles with V4.0 or above.
3.2 Connection
When the installation of parameter setup app is complete, power on T8S then connect it with the
phone as below picture shown. the mobile will show a USB port is connected. Click confirm and enter
APP interface.
Note The smaller head of the USB cable connects with T8S while the bigger head connects with OTG
cable. The smaller head of the OTG cable connects the mobile.
The OTG cable should connect with the mobile, otherwise T8S can ’ t be connect with the APP
successfully.
Some smart-phones (eg. OPPO R9s) need to open the OTG function to ensure successful connection
(settings - Other settings - OTG Connection)

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3.3 Parameters Setup Menu
There are four parameter setup menus: SERVO/BASIC/ADVANCED/SYSTEM
If the mobile connects T8S successfully, the SERVO menu will be reached directly when open the APP. If
not successfully, click “CONNECT”. If still fail, click”DISCONNECT” the reconnect OTG cable then click
“CONNECT” in the APP.
OTG
Cable
Android USB Cable
Note
OTG cable must
connect with the
mobile

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(DIS)CONNECT: When APP is opened on the mobile, T8S will be connected automatically. If can’t be
identified, click DISCONNECT then CONNECT again.
READ: Click READ, the APP will start reading the data in T8S, the process won’t complete until 4 D
sounds are heard. Every time reopen the APP, the data displayed are default. If any parameter is
changed, it can’t be displayed until clicking READ.
UPDATE: Click to update the changed data into the T8S and a D sound means update complete. If no D
sound means fails to update. Click UPDATE each time parameter is modified.
SAVE: Click to save the APP data in the /model/model01.text in the mobile and APP will automatically
create a model01. txt file.
LOAD: Click LOAD and the APP will take the data from /model/model01.txt. APP will notify if this file
can’t be found.
CLOSE: Click Close to exit.
Note
There is T8S(T8FB) voltage displaying on each menu.
Whenever parameter modification is needed, click READ then set the data as wish then click‘UPDATE”
to finish parameter setting.
3.3.1 SERVO Menu
The 8 rectangles shows the CH1-CH8 servos range(4 basic channels and 4 auxiliary channel) from left
to right.

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3.3.2 BASIC Menu
There are six parameters to setup including ”REV”“SUB”“EPA-L”“EPA-R”“F/S”“DELAY”
REV: Defines the relationship between the transmitter controls and the receiver output for channels
with options of NORM and REV. Make sure to check all servos move to the correct direction as wish
under control. Make sure to check all servos move to the correct direction under control.
Note
If programmable mix control function is used to control several servos for fixed wing/gliders,
eg. V-TAIL mix control, make sure to set the phase to avoid possible confusion.
SUB: Makes small changes or corrections to the neutral position of each servo. The default is 0
setting by factory setting. That is, no SUB-TRIM. The range is from -120 to +120 and can be modified
with actual need.
It ’ s advised to center the digital trims before making SUB-TRIM changes, and keep all of the
SUB-TRIM values as small as possible. In order to restrict the servo travel range, the recommended
procedure is as follows:
•Measure and record the desired surface position;
•Zero out the SUB-TRIM ;
•Mount servo arms and linkages so that the control surface’s neutral is as correct as possible;
•Modify with SUB-TRIM small range value to make fine corrections.
EPA-L &EPA-R : Sets the range of each channel in percentage. The most flexible version of travel
adjustment is available. It independently adjusts each end of each individual servo’s travel, rather
than one setting for the servo affecting both directions. The default value is 96.

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F/S: Sets responsive action of model in case of signal loss or low Rx voltage(in percentage).
Each channel can be set independently.
•The NOR (normal) setting holds the servo in its last commanded position.
•The F/S (Fail Safe) function moves each servo to a predetermined position.
Note
The setting of the throttle F/S also applies to the low battery voltage. F/S value 0 means throttle stick
at the lowest point while 50 means at the central point.
The F/S function is used in certain competitions to ensure safety landing of the model prior to flying
away and dropping. Conversely, it can also be used make all servos neutral to maximize the flight
time.
DELAY: Adjusts the synchronous ratio between the servos position and the actual operation. The
default value is 100 by factory setting meaning no delay.
3.3.3 ADVANCED Menu
There are four parameters to setup: ”D/R” “ATTITUDE” “ELEVON” “V-TAIL”
D/R: Sets the auxilary switch to control the max and min values of corresponding channel range. Turn
on “MIX” (mix control) first and choose an auxilary switch to flip and set the max/min range value to
its correspoding channel by toggling. In the example picture shown above: When flip SWA upward and
toggle CH1 stick , it means the max/min range of CH1 can be +100 and -100. If the UP value modified
to 50, it means the max range can only be +50/-50 when toggle CH1 up and down. ‘DOWN” means
when flip SWA downward, the max/min value of CH1 is +100/-100.
ATTITUDE: Turn on“CH”first and select the preferred channel. The values behind each channel means
different control percentage output different control signals.

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Pilots can set 6 different modes (NORMAL, ATTI, GPS, HOVER, F/S and AUX) by adjusting the related
rates. Every mode has different rates to get a unique signal. NORMAL mode preset 0%, ATTI 50%, GPS
100%, HOVER 25%, F/S 75% and AUX 50%. 0% means a output signal 1ms, and 100% means 2ms.
ELEVON: Turn on “MIX” (mix control) first, adjust the aileron distance and allow aileron differential.
ADJUSTABILITY:
•CH1 and CH2 are required.
•Independently adjustable aileron travel allows aileron differential.
•Independently adjustable elevator travel allows for differences in up vs. down travel.
•The separate ELEVON settings for each condition can be set. (GLID only)
V-TAIL: This function is used on the V-tail aircraft.
V-TAIL mixing is used with v-tail aircraft so that both elevator and rudder functions are combined for
the two tail surfaces. Both elevator and rudder travel can be adjusted independently on each surface.
ADJUSTABILITY:
•CH2 and CH4 are required.
•Independently adjustable travel allows for differences in servo travels.
•Rudder differential is not available. To create rudder differential, set RUD1 and 2 to 0, then use two
programmable mixes, RUD-ELE and RUD-RUD, setting different percentages for up and down. These
are new rudder travels. Turn the trim and link off, switch assignment null so rudder won ’ t be
accidentally turned off.
Note
V-TAIL function and ELEVON/AILEVATOR mix functions can’t be activated at the same time. If both of
these functions are activated, an error message will be displayed and you must inactivate the last
function prior to activating ELEVON.
Make sure to move the elevator and rudder sticks regularly while checking the servo motions. If a large
travel value is set, when the sticks are moved at the same time, the controls may mutually disturb or
run out of travel. Decrease the travel until no disturbance occurs.
3.3.4 SYSTEM Menu
There are three parameters to set: “AUX-CH” “PROG.MIX1” “PROG.MIX2”

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AUX-CH
CH5/6/7/8 Auxilary channels Ch5 to Ch8 can be personalized to different switches
TX Alarm When the transmitter voltage is lower than the value set, T8S will make D sound to warn.
STK-MODE By default, 1 is throttle at right while 2 is throttle at left. 3 is throttle at right for toys while 4
is throttle at left for toys.
VERSION: The numbers mean different versions.
PROG. MIX1/PROG. MIX2
Programmable mix controls is to
1. Diversify attitude changes of aircraft (eg. Rolling to realize when rudder are commanded);
2. Control a certain axis with two or more servos(eg. 2 rudder servos);
3. Correct special movement automatically (eg. Lower FLAP and ELEVATOR servos at the same time);
4. Control the second channel to respond to the movement of the first channel(eg. Increase smoke oil
to respond to high speed, but only when the smoke switch is activated).;
5. Turn off the main control under certain circumstances (eg. For dual-engine aircraft, turn off a motor
or speed up/down one motor to assist rudder to turn)
PROG. MIX1: the mix control of AILERON and ELEVATOR servos is to assist turning.
PROG. MIX2: the mix control of ELEVATOR and FLAP servos is to loop in small diameter.
Adjustability: Channel 1 to 8 can be personalized to mix.
MAS: Master channel. Other channels need to cooperate with movements of the master channels.
SLA: Slave channel. Many mix controls are controlled by one master channel. Eg. Rudder-Aileron mix
control with ration of 25% to correct rolling. No switch is needed.
Chapter 4 T8S Parameters Setup via Computer
4.1 Software Installation and Connect
Connect the computer and the T8S with an android usb cable
Open the parameter setup software in the downloaded file，then power on T8S
Choose Port Number(T8FB connect to COM will automatic identified when connect to computer),
setting baud rate: 115200,8-1-None(8 data bits, 1 stop bit, no parity check), click OPEN to connect.

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4.2 Parameters Setup Menu
READ T8S data will be read and displayed on computer when click “READ”(red and green LEDs will
flash quickly when reading).
LOAD The data file in txt format saved will be loaded in the software
UPDATE Modify the data as wish then click“UPDATE”to change the parameter in T8S. (red and green
LED will flash slowly once).
SAVE The data read or set will be saved as TXT file in the computer.
4.2.1 BASIC Menu
There are 6 parameters to setup: “REVERSE””SUB-TRIM””END POINT””FAIL SAFE””AUX-CH””
DELAY”

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REVERSE: Defines the relationship between the transmitter controls and the receiver output for
channels with option of NORM and REV. Refer to 3.3.2 for more details .
SUB-TRIM: Makes small changes or corrections to the neutral position of each servo. Refer to 3.3.2
for more details .
END POINT: Sets the range of each channel(in percentage);
The most flexible version of travel adjustment is available. It independently adjusts each end of each
individual servo’s travel, rather than one setting for the servo affecting both directions. Refer to 3.3.2
for more details .
FAIL SAFE: Sets responsive action of model in case of signal loss or low Rx voltage(in percentage).
Refer to 3.3.2 for more details .
AUX-CH: Defines the relationship between the transmitter controls and the receiver output for
channels 5-8. Refer to 3.3.4 for more details .
DELAY: Adjust the ratio between the position of servos and the actual operation. Refer to 3.3.2 for
more details .
4.2.2 ADVANCE Menu
There are six parameters setup ”D/R” “ATTITUDE” “ELEVON” “V-TAIL”PROG.MIX1/PROG.MIX2
as below shown:
Refer to 3.3.3 and 3.3.4 for more setup details of all parameters.

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4.3 Parameters Save in T8S
1. Connect T8S with computer via an android cable and power on T8S
2. Make sure the correct port is identified and click OPEN to connect
3. Modify the parameters as wish and click UPDATE. If updated successfully, T8S makes a B sound
4. Disconnect T8S from computer and repeat step 1 and 2
5. Click READ, parameters will be changed with the modified ones automatically and T8S makes short
and fast B sound, meaning modified data has been well recorded into T8S
Chapter 5 FAQ Shooting
What is the order of the connections for APP--USB--T8S ?
A: The best order is: Turn on T8FB -- connect USB cable-- connect APP. When
APP is connected, a notice will pop out to open APP.
Why the voltage displayed always moves up or down when connecting T8S to APP, sometime is 0,
sometime is 7.98v ?
A: Close the APP, then reconnect again will solve this problem.
Why the APP shows the flashback reminder?
A: Please contact our sales-after service, we will send you a upgrade software to solve this problem.
What are the correct steps for the “READ”?
A: In general, please click the “READ” first after connecting T8FB to APP to make sure the data of APP
is the default data or you setup last time.
How to restore factory settings?
A: When the APP opens (don’t click READ ) with the current data is factory setting data, click UPDATE
to so restore the factory setting.
What if the APP always fails to connect to T8S?
A: It could possibly because of the android USB cable. If not, please contact our after-sales service.
The TXT document of “Smart-phone APP” and “the computer parameter setting software” can
work for the same effect ?
A: Both of the two files are the same, but the name of computer software needs to be changed as
“model01.txt”, then create a file box (model) at root directory in Phone, put the “model01.txt” in
“model” .