RadioLink T8S(BT) User manual

T8S(BT)
(FHSS)
User Manual
8-Channel Remote Controller
APP Parameter Setting via Bluetooth Connection
Compatible with Fixed-wings/Gliders/Multirotors/Cars/Boats/Robots
CE FCC RoHS
V2.0

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Content
Chapter 1 Introduction.................................................................................................................................. 2
1.1 Operation precautions ............................................................................................................................ 2
1.2 T8S+R8EF introduction..........................................................................................................................2
1.2.1 Specification ......................................................................................................................... 2
1.2.2 Recommended accessories .................................................................................................3
1.2.3 Transmitter Hardware ........................................................................................................... 3
1.2.4 Transmitter Battery Charging ...............................................................................................4
1.2.5 T8S Gimbals Calibration.......................................................................................................4
1.3 R8EF Receiver ....................................................................................................................................... 5
1.3.1 Receiver Mode and Signal Switch........................................................................................5
1.3.2 Receiver Connection ............................................................................................................ 5
1.3.3 Guide of Receiver Install ...................................................................................................... 6
1.3.4 Binding .................................................................................................................................. 6
Chapter 2 Parameters Setup APP ...............................................................................................................7
2.1 Mobile phone APP..................................................................................................................................7
2.1.1 APP Installation.....................................................................................................................7
2.1.2 APP Connection.................................................................................................................... 7
2.1.3 Parameters Setup Menu.......................................................................................................8
2.2 Software APP on Computer ................................................................................................................... 9
2.2.1 Software APP Installation .....................................................................................................9
2.2.2 Software APP Connection .................................................................................................... 9
Chapter 3 Function Setup Menu on APP ....................................................................................................11
3.1 SERVO Menu........................................................................................................................................11
3.2 BASIC Menu.........................................................................................................................................12
3.2.1 REVERSE...........................................................................................................................12
3.2.2 SBU-TRIM ..........................................................................................................................13
3.2.3 END POINT ADJUSTMENT (EPA).....................................................................................14
3.2.4 FAIL SAFE (F/S) .................................................................................................................15
3.2.5 DELAY ................................................................................................................................16
3.2.6 AUX.CH...............................................................................................................................16
3.3 ADVANCED Menu................................................................................................................................17
3.3.1 D/R (Dual Rate).............................................................................................................17
3.3.2 ATTITUDE...........................................................................................................................18
3.3.3 ELEVON .............................................................................................................................19
3.3.4 V-TAIL .................................................................................................................................20
3.3.5 PROG.MIX..........................................................................................................................21
3.3.6 TH/CURE............................................................................................................................22
3.4 SYSTEM Menu.....................................................................................................................................22
3.4.1 ALARM SETTINGS ............................................................................................................22
3.4.2 STK-MODE(SYSTEM) .......................................................................................................24
3.4.3 RESET ................................................................................................................................25
Chapter 4 Firmware Upgrade.....................................................................................................................26
4.1 Firmware Version .................................................................................................................................26
4.2 Firmware Upgrade Steps .....................................................................................................................27
4.2.1 Driver Installation ................................................................................................................27
4.2.2 Download Software and Upgrade Firmware ......................................................................29
Thanks........................................................................................................................................................34

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Chapter 1 Introduction
1.1 Operation precautions
1) Do not use the remote controller in the rain!
Avoid moisture entering the transmitter. If it is
unavoidable to use this product in humid
weather (such as competitions), please cover
your remote controller and receiver with a
waterproof cloth, and do not fly if there is
lightning.
2) Don’t use it in rainy and snowy weather. This
weather environment will interfere with the
remote controller equipment, resulting in loss
of control and accidents!
3) Don’t use this equipment in crowded areas and
places prohibited by national laws and
regulations!
4) Do not allow children (Less than 14 years old)
to touch this product. This product is not a toy.
Please be careful when operating in scenes
where children are present.
5) Please strictly abide by local laws and
regulations when flying to ensure safe flight!
6) Make sure the throttle stick and trim button are
set at the lowest end before turning on, then
turn on the power button and check whether
the power supply is sufficient, then turn on the
receiver!
7) Check whether the various actions of servo are
consistent with the direction of the
corresponding joystick before operating the
model. If they are inconsistent, please adjust
before using!
8) Please turn off the receiver and controlled
equipment before stopping use, and then
turn off the power supply of the transmitter. If
the operation is reversed, it may cause loss of
control and cause an accident!
9) T8S transmitter has a built-in lithium battery
with an operating voltage of 3.7V~4.2V.
Please do not use a battery outside this
voltage range when replacing the battery by
yourself.
10) The T8S is compatible with
R8EF/R8F/R8FM/R8SM/R7FG/R6FG/R6F/R4F
GM/R4F receivers. Other brands of receivers
cannot be used.
11) Please refer to the website to modify the
throttle hand and return to the center position
joystick:
https://www.youtube.com/watch?v=b-
97TUi3_Rw
12) Any loss caused by the use of this product shall
be borne by the user.
1.2 T8S+R8EF introduction
1.2.1 Specification
Size 162.5*95.5*57mm(6.4 “*3.76“* 2.24”)
Weight 140g(5.0oz)
Channel Quantity 8 channels
Control Range about 2000 meters in the air (actual distance depends on the flight environment)
Operating Current <80(± 5)mA
Operating Voltage 3.7- 4.2V
ACPR >36dbm
Frequencies Band 2.4GHz ISM band（2400MHz~2483.5MHz）
Modulation Mode GFSK
Bandwidth 400KHZ
Spread Spectrum Mode FHSS 67 channels pseudo-random frequency hopping
Compatible receivers R8EF(Standard), R8SM, R8FM, R8F, R7FG, R6FG, R6F, R4FGM, R4F
T8S Transmitter

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1.2.2 Recommended accessories
The following accessories are not the standard accessories of the T8S remote controller. You can
scan the QR code below to buy them on AliExpress, and visit our official website www.radiolink.com for
more products and details.
R8SM Mini receiver (2 gram) F121 Pro FPV Training Drone
Wireless Trainer Cable Byme-D Delta Wing Flight Controller
1.2.3 Transmitter Hardware
Size 41.5*21.5*11.5mm (1.63” *0.85” *0.45”)
Weight： 14g
Channel Quantity 8 channels
Control distance
about 2000 meters in the air (actual distance depends on the flight environment)
Operating Current 38-45mA@5V
Operating Voltage 4.8V-10V DC
Signals Output SBUS&PPM&PWM
Compatible transmitter T8FB/T8S/RC6GS V2/RC4GS V2/RC6GS/RC4GS
R8EF Receiver

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Power button: Long press to turn it on or off; or press it to confirm the connection when upgrading the
firmware.
Throttle/Rudder/Aileron/Elevator Stick: The default Channel 1 to Channel 4 controls the roll, pitch, throttle
and yaw of the aircraft.
Trimmer buttons: T8S has 4 groups trimmer buttons (two for each group), which can trim roll, pitch,
throttle and yaw respectively. The trimmer buttons are used to quickly adjust the model during flight. When
debugging the model, please adjust it through SUB function in the parameter setting APP.
Three-way switch: CH7 (SWA) and CH5 (SWB) are three-way switches, which can be assigned to the
auxiliary channel through APP to control the equipment connected to this channel. (Note: If you have
purchased Radiolink RTF with a T8S transmitter, the three-way switch CH5 (SWB) controls the switching of
the flight mode by default.)
Knob switch: CH8 (VRA). This switch can be set by parameter setting APP according to your needs, and is
mostly used for Pan/Tilt/Zoom adjustment.
Push button: CH6 (VRB). This switch can be set by parameter setting APP according to your needs, and it
is mostly used to control camera shutter.
1.2.4 Transmitter Battery Charging
The built-in battery of T8S is 1S lithium. When the voltage is low, the green indicator will flash with a DD
warning sound. Make sure to charge the battery in time to avoid the possible damage by over discharge.
T8S charging is simple, only need an android USB data cable. It takes approximately 40 minutes to fully
charge T8S with 4 green Indicator lights on. It can be used for 5 hours when fully charged.
1.2.5 T8S Gimbals Calibration
When the transmitter power is off, set both joysticks at the central point. Then press the rudder trimmer
button (it marked as No.1 in below picture) and the power button simultaneously. When four green
indicators start flashing, it means 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.
Central Point Calibration: When the joysticks are back to the central point, press the rudder trimmer
button (with an arrow to right and marked as No.2 in below picture) once. Two short DD sounds will be
heard and the green indicator becomes steady on, meaning the stick calibration is complete.
1
2
4
3
5
6
7
8

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1.3 R8EF Receiver
1.3.1 Receiver Mode and Signal Switch
The R8EF receiver supports two modes: PWM single signal output and SBUS&PPM&PWM multi-signal
output. Short press the ID SET button twice (within one second) to complete the PWM signal output mode
or SBUS&PPM&PWM multi-signal output mode switch.
PWM signal is red light, SBUS&PPM&PWM multi-signal is blue light.
⚫PWM mode:
All 8 channels of R8EF receiver output PWM signals
⚫SBUS&PPM&PWM mode: The channel 1
of R8EF outputs the SBUS signal, and
channel 2 outputs the PPM signal.
Channel 3-8 output the corresponding
PWM signal.
1.3.2 Receiver Connection
The connection wire for receiver is shown in the picture above. The common ones are white/red/black
wire or yellow/red/brown wire. The two types of servo cables both are the light-colored wire as the signal
wire, the dark-colored wire as the ground wire, and the middle is 5V power supply, and the three wires
correspond to “ ”.

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Note:
1.Radiolink receivers are all designed with anti-polarity connect protection. When the servo cable is
plugged reversely, the receiver will not work.
2.The receiver operating voltage is 4.8V-10V. When the receiver uses a separate battery for independent
power supply, the receiver will not be damaged if the battery polarity is reversed, but if the servo is
connected at this time, it will cause damage to the servo.
1.3.3 Guide of Receiver Install
①Keep antennas as straight as possible, or the effective control range will reduce. PS: Generally, the
receiver’s antenna is longer than the body of drone, but also shouldn't break or shrink the antenna into it.
②Big 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.
③Antennas should be kept away from metal conductor and carbon fiber at least half inch away and no
over bending.
④Keep antennas away from motor, ESC or other possible interference sources.
⑤Receiver contains some electronic components of high-precision. Be careful to avoid strong vibration
and high temperature.
⑥Special 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. Putting the receiver into a plastic bag can also prevent fuel and residue from
entering.
1.3.4 Binding
Every transmitter has a unique ID code. Before using, binding transmitter to receiver on aircraft is a
must. When binding is finished, ID code will be stored in the receiver, no need to rebind, unless the receiver
is going to work with another transmitter. If you purchase a new compatible receiver, binding needs to be
done before using.
Binding steps of all transmitters and receivers from RadioLink are the same as follow:
①Put the transmitter and the receiver close to each other (about 50 centimeters).
②Long press the Power Switch to make the T8S power on.
③Power on the R8EF, the LED of R8EF will start flashing slowly.
④There is a binding button(ID SET) on the side of receiver. Press the button until the LED flashing
quickly and release, binding process is ongoing.
⑤When the LED stops flashing and turns to always on, binding is complete. If not succeed, the LED
will keep flashing slowly to notify, repeat the above steps.

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Chapter 2 Parameters Setup APP
2.1 Mobile phone APP
2.1.1 APP Installation
Android APP: Visit https://www.radiolink.com/t8s_APPs to
download the android APP to setup T8S parameters by Bluetooth
connection.
NOTE: The APP will not collect any user's information, you
can even use this APP without Internet connecting. The APP asked
for Location Permission only used for connecting and telemetry
function.
Apple APP: Search Radiolink or T8S in Apple store and then click it to download.
2.1.2 APP Connection
Connection of both Android APP and Apple APP to T8S are the same as below:
①When the installation of parameter setup APP is complete, press the power button to turn on T8S.
②Click to enter the APP, a message will pop out to ask for permission to turn on the Bluetooth
function.
③Click CONNECT on the top left of interface, a list of devices will pop out for selection.
④Select RadioLink device, the
two LED indicators at rightmost will
flash with DD sounds.
⑤Press any of the trimmer
buttons to stop the DD sounds and the
servo range will display on the APP,
meaning connection between the APP
and T8S succeed (Go to page 3 to see
the location of trimmer buttons).
Note:
If there is no servo range display in
APP, it means the connection is
unsuccessful and you need to
reconnect.
If you cannot find the Bluetooth
device with the name “Radiolink” after
clicking “CONNECT”. Please check
whether the “Location Information” of
your phone is turned on, if not, please
open the “Location Information”;
If the “Location Information” is on, but you still can’t find “Radiolink Bluetooth device”. Please open the
application in the phone --settings-application management--T8S&T8FB permissions--location

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information, change the location information from “only allowed during use” to “Prohibited”, and then
change to “allowed only during use” again.
If all the steps above have finished, but the mobile phone parameter setup APP still cannot connect the
transmitter success, please download the version V603.
2.1.3 Parameters Setup Menu
The parameter setting phone APP only displays four interfaces by default: “SERVO”, “BASIC”,
“ADVANCED”, “SYSTEM”.
(DIS)CONNECT: When APP is opened and T8S is powered on, click CONNECT and a list of Bluetooth
devices will pop out and select the RadioLink device to make connection. The two LED at the rightmost will
flash with DD sounds, press any of the trimmer buttons to stop the DD sounds and the servo range will
display on the APP. If fails, press DISCONNECT and CONNECT again.
READ: Click READ, two short D sounds will be heard and the APP starts reading the data in T8S. Every
time the APP is reopened, the data displayed is the initial default value. If the parameters are modified, you
need to click to “READ”again to display the modified data.
WRITE: Click “WRITE”and three slow D sounds mean the modified data have been written successfully.
If no D sound means written failure, please reconnect T8S to the APP and re-write. Click “WRITE”each time
parameter is modified to make sure it’s well input to the T8S.
LOAD（Load/New/Delete model）:
There are three functions can be set by press LOAD, that is load or select model data that have set
already and add a new model.
①Load model: A tooltip will pop out when Click LOAD, and then click “SELECT”to load the model
data from this tooltip. If there is no model data have stored successfully, the tooltip will show blank.
②Create new model: Click "NEW" and name the new model, for example, “RacingDrone1”. Click "YES"
to save the new model’s name, then click the model’s name, the gray title bar on the top of tooltip will
change to RacingDrone1, click “SELECT”to select the model’s name, and then set up all the parameters

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depends on your drone, click “STORE”to save the settings, “/mode/RacingDrone1.txt”pop out means the
new model have set successful.
③Delete model: choose a model’s name from the tooltip, for example, still the “RacingDrone1”, the
gray title bar on the top of tooltip will change to RacingDrone1, then click “DELECT”, an alert box will pop
out, click “YES”to delete the model data.
STORE: Click to save the APP data as a file in the mobile.
Note:
T8S support unlimited number of model data to store, and easy to search in the phone.
If the new file created is forgotten to rename, but STORE as Model-New, the data in this file will be
cleaned automatically when trying to create another new file sharing the same file name.
2.2 Software APP on Computer
2.2.1 Software APP Installation
Go to the official website https://www.radiolink.com/t8s_apps to download the computer software APP,
and run the program below.
If it’s your first time to use computer parameter APP, you need to install the driver before using it.
Please click the link below to download and install driver: http://radiolink.com/filedownload/51482 or
contact us by email at: [e-mail]
2.2.2 Software APP Connection
After the driver is installed, T8S transmitter can connect to computer parameter software.
①Turn on T8S transmitter, and connect it to the computer with a USB data cable.
②Open the parameter software in the downloaded file. Choose Port Number (The COM port of
different computers will be different), click OPEN to connect.

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Note: If the driver is installed normally, but the COM port connected to T8S cannot be detected, you
could try to another USB data cable. Do not use USB charging cable.
③T8S will continuously make D sounds, press any of the trimmer buttons (Go to page 3 to see the
location of trimmer buttons) to stop the DD sounds.
READ: Click READ, two short D sounds will be heard and the APP starts reading the data in T8S. Every
time the APP is reopened, the data displayed is the initial default value. If the parameters are modified, you
need to click to “READ”again to display the modified data.
WRITE: Click “WRITE”and three slow D sounds mean the modified data have been written successfully.
If no D sound means update failure, please reconnect T8S to the APP and re-write. Click “WRITE”each time
parameter is modified to make sure it’s well input to the T8S.
LOAD: Click LOAD and a pop out of ‘Model Select’will display. If there is no successfully stored data,
there will be no display. Besides, user also can create a new file or select among the saved files.
SAVE: Click to save the APP data as a file in the computer.

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Chapter 3 Function Setup Menu on APP
3.1 SERVO Menu
The 8 rectangles show the CH1-CH8 servos range instantly (4 basic channels and 4 auxiliary channels)
from left to right. CH1--Aileron, CH2 - Elevator, CH3 - Throttle, CH4--Rudder, CH5 to CH8--Auxiliary
channels.
There is a real-time display when you are toggle any channel switch, it is suitable for set up complex
mix control functions.
The interface of parameter setup APP on phone.
The interface of parameter setup software on computer.

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3.2 BASIC Menu
3.2.1 REVERSE
This function is to change the direction of the servo in response to the remote controller input. Make
sure to check all servos move to the correct direction as wish under control.
Note: If programmable mix control function is used to control several servos for fixed wing/gliders, e.g.
V-TAIL mix control, make sure to set the phase in advance to avoid possible confusion.
The interface of parameter setup APP on phone.
The interface of parameter setup software on computer.
After changing the channel phase, please check the control of the corresponding channel on the
model, to make sure the response direction of the channel is correct. Make sure that the response of each
servo with the operation of transmitter is correct.

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3.2.2 SBU-TRIM
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 -100 to +100 and can be modified with actual
need.
The interface of parameter setup APP on phone.
The interface of parameter setup software on computer.
This function is used to set the neutral position of the servo, not to set the servo surface to be
horizontal.
This function is used to set the neutral position of the servo, not to set the servo surface to be
horizontal.
So, the recommended steps are as follows:
•Zero out the SUB-TRIM when the servo is not connected to servo surface, and adjust the neutral
position of the servo through SUB-TRIM.
•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.

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3.2.3 END POINT ADJUSTMENT (EPA)
This function is used to set travel range of the servo connected to the channel.
When setting the model or after the first flight, if you feel that the movement of the model is still
relatively small when you move the joystick to the maximum position. You can increase the travel range
percentage of the corresponding channel of the servo (the maximum can be adjusted to 120, The default is
96).
The interface of parameter setup APP on phone.
The interface of parameter setup software on computer.
EPA-L and EPA-R respectively represent the travel range on two sides of the neutral point. You can
choose the side you want to modify to adjust travel range percentage.

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3.2.4 FAIL SAFE (F/S)
If the flight has reached the limit control distance, there is strong interference in the flight area, there
are obstacles between the transmitter and the receiver, or T8S low voltage it will cause loss of control. At
this time, you can set the Fail-Safe, so that the model can maintain working at the F/S value you set after
loss of control. F/S needs to be set in advance. Each channel can be set independently.
According to your needs, set the servo travel range output by the channel. After setting it, the receiver
will continue to output the servo travel range according to the value you set when the receiver loses the
control of transmitter.
The interface of parameter setup APP on phone.
The interface of parameter setup software on computer.
Note:
1.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.
2.The F/S (Fail-safe) function can be used in certain competitions to ensure safe landing of the model
prior to flying away and dropping. Besides, it can also be used make all servos neutral to maximize the flight
time.

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3.2.5 DELAY
Adjusts the synchronous ratio between the servos position and the actual operation. The default value
is 100 by factory setting meaning no delay.
3.2.6 AUX.CH
The CH1/2/3/4 of the T8S transmitter are 4 basic channels, and CH5/6/7/8 are auxiliary channels. The
switch of the basic channel cannot be modified. But different switches can do some auxiliary functions by
setting CH5/6/7/8, such as control the opening and closing of the bait hopper, control whether the machine
releases smoke or not etc.
Each auxiliary channel can be customized with one of three-way switch, toggle-switch or push-switch.
Any one of three-way switch, toggle-switch or push-switch can also be set to control different channels.
And the final effect can be seen on the “SERVO MENU” interface.
Note that If you flip any switch and two channels will change, please check whether the two auxiliary
channels are set to the same switch.
The interface of parameter setup APP on phone.
Click the auxiliary function of CH5/6/7/8, there will be five options of “SWA”, “SWB”, “VrA”, “VrB” and
“NULL” for selection.” NULL “means no switch control.
The interface of parameter setup software on computer.

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3.3 ADVANCED Menu
3.3.1 D/R (Dual Rate)
The model can be controlled to work on different servo travel range by a switch. Before using this
function, set the state of “Mix” from “INH” to “ON”.CH1/2/3/4 can be chosen to set separately. the switch
can be set to SWA or SWB. “Up” and “Down” correspond to the positions of switch. The value of “Up” and
“Down” is maximum servo travel range you set.
DR/CURE: It’s an index. When it is not set, the value defaults to 0, and the output servo travel range of
the corresponding channel will be output in proportion to the move of the joystick. The value can be set
from -100% to +100%. The change of the index will not change the maximum and minimum servo travel
range. When controlling the aircraft, the index setting value is usually negative.
⚫When the index is a negative value, the greater the negative value, the lower the sensitivity of the joystick
in the neutral position and the higher the sensitivity at both ends position.
⚫When the index is a positive value, the greater the positive value, the higher the sensitivity of the joystick
in the neutral position, and the lower the sensitivity at both ends position.
The interface of parameter setup APP on phone.
The interface of parameter setup software on computer.

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3.3.2 ATTITUDE
Select the preferred channel from CH5 through CH8. CH5 is always the default switch to change
attitude when connect to flight controller PIXHAWK/MINI PIX/APM/TURBO PIX while CH7 is default when
connect to DJI flight controller. For the default channel to switch attitudes, please refer to the flight
controller user manual.
Note: After open the “Attitude” function, the switch of CH5 and CH7 will be used by default to control
the output of the “attitude channel”.
The values behind each channel means different control percentage output different control signals.
The default values of T8S of each attitude is corresponding to the values of flight controller PIXHAWK/MINI
PIX/APM/TURBO PIX. That is, when the above flight controllers are used with T8S, attitude can be selected
on the Mission Planner and no need to setup specific parameter.
The interface of parameter setup APP on phone.
Different values can be set for ATTI 1 to ATTI6.Then you can change the flight attitude by press
CH5/CH7.
The interface of parameter setup software on computer.

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3.3.3 ELEVON
“Elevator mix” is also known as “delta wing mix”. It is often used for delta wing aircraft. Two servos can
control two servos surfaces that on the left and right sides of the aircraft separately, and operate aileron
function and elevator function.
When “MIX”is set from “INH”to “ON”, the “AILE” and “ELEV” function is turned on. When this function
is turned on, then both CH 1 and CH2 will respond, and servo travel range can be adjusted individually.
⚫AILE 1 and ELEV 2 correspond to the response rate of channel 1 when performing aileron operation
and elevator operation.
⚫AILE 2 and ELEV 1 correspond to the response rate of channel 2 when performing aileron operation
and elevator operation.
The interface of parameter setup APP on phone.
The specific value is the amount of servo travel range when the corresponding channel performs the
aileron or elevator operation. Positive and negative values represent different directions of movement.
The interface of parameter setup software on computer.