RadioLink t8fb User manual

T8FB(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

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Content
Chapter 1 Introduction..................................................................................................................................................3
1.1 Operation precautions ........................................................................................................................................... 3
1.2 T8FB+R8EF introduction ........................................................................................................................................4
1.2.1 Specification .......................................................................................................................................... 4
1.2.2 Packing List ............................................................................................................................................ 4
1.2.3 Recommended accessories ..............................................................................................................5
1.2.4 Transmitter Hardware.........................................................................................................................6
1.2.5 Transmitter Battery Charging .......................................................................................................... 7
1.3 R8EF Receiver .............................................................................................................................................................7
1.3.1 Receiver Mode and Signal Switch..................................................................................................7
1.3.2 Receiver Connection...........................................................................................................................8
1.3.3 Guide of Receiver Install ....................................................................................................................9
1.3.4 Binding .....................................................................................................................................................9
Chapter 2 Parameters Setup APP........................................................................................................................... 10
2.1 Mobile phone APP ................................................................................................................................................ 10
2.1.1 Mobile Phone APP Installation.....................................................................................................10
2.1.2 Mobile Phone APP Connection....................................................................................................10
2.1.3 Mobile Phone APP Parameters Setup Menu ...........................................................................11
2.2 Software APP on Computer ...............................................................................................................................13
2.2.1 Software APP Installation on Computer ................................................................................... 13
2.2.2 Software APP Connection on Computer.................................................................................. 13
Chapter 3 Function Setup Menu on APP ............................................................................................................. 15
3.1 SERVO Menu ........................................................................................................................................................... 15
3.2 BASIC Menu.............................................................................................................................................................16
3.2.1 REVERSE ................................................................................................................................................16
3.2.2 SUB-TRIM .............................................................................................................................................17
3.2.3 END POINT ADJUSTMENT (EPA)..................................................................................................18
3.2.4 FAIL SAFE (F/S) ....................................................................................................................................18
3.2.5 DELAY.....................................................................................................................................................20
3.3 ADVANCED Menu ..................................................................................................................................................21
3.3.1 D/R (Dual Rate).................................................................................................................................. 21
3.3.2 ATTITUDE ..............................................................................................................................................22
3.3.3 ELEVON ................................................................................................................................................. 24
3.3.4 V-TAIL.................................................................................................................................................... 25
3.4 PROG.MIX Menu .................................................................................................................................................... 26
3.4.1 PROG.MIX .............................................................................................................................................26
3.4.2 TH/CURE ............................................................................................................................................... 27
3.4.3 DR/CURE ...............................................................................................................................................28
3.4.4 SYSTEM Menu..................................................................................................................................................... 28
3.4.4.1 AUX.CH .............................................................................................................................................. 28
3.4.4.2 ALARM ...............................................................................................................................................29

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3.4.4.3 Version MODE.................................................................................................................................31
3.4.4.4 RESET..................................................................................................................................................32
Chapter 4 Firmware Upgrade ...................................................................................................................................33
4.1 Firmware Version ................................................................................................................................................... 33
4.2 Firmware Upgrade Steps.....................................................................................................................................34
4.2.1 Driver Installation .............................................................................................................................. 34
4.2.2 Download Software and Upgrade Firmware...........................................................................36
Chapter 5 T8FB Calibration ....................................................................................................................................... 41
Thanks ...............................................................................................................................................................................43

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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) T8FB with an operating voltage of
4.8V~18V. Please do not use a battery
outside this voltage range when
replacing the battery by yourself.
10) The T8FB is compatible with R8EF/R8F/
R8FM/R8XM/R8SM/R8FG/R7FG/R6FG/R
6F/R4FGM/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=hp4
g-NTMqMg
12) Any loss caused by the use of this
product shall be borne by the user.

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1.2 T8FB+R8EF introduction
1.2.1 Specification
1.2.2 Packing List
T8FB Transmitter *1 R8EF receiver *1 Packing Box *1

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User Manual *1 Hook and Spring *1
1.2.3 Recommended accessories
The following accessories are not the standard accessories of the T8FB. You can 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-A Flight Controller

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1.2.4 Transmitter Hardware
T8FB (Mode 2) is shown as below
Note：The phases of the 4 channels can be easily changed by prodding the corresponding phase
switches instead of modifying the parameter data in the software/APP.
T8FB Buttons and Switches:
Power button: Push it up or down to turn it on or off; or push 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: T8FB 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.
Switch A and Switch B: CH7 (SWA) is two-way switch, and and CH5 (SWB) is three-way switch.
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 T8FB transmitter, the three-way
switch CH5 (SWB) controls the switching of the flight mode by default.)

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Slider switch: CH8 (VRA) and CH6 (VRB) can be set by parameter setting APP according to your
needs, and is mostly used for Pan/Tilt/Zoom adjustment.
The back part of T8FB:
1.2.5 Transmitter Battery Charging
The working voltage of T8FB is 4.8V-18V, and the low voltage alarm is self-adaptive. For
example: if you are using a 2S lithium battery to power T8FB, T8FB will send out a beep sound
alarm when the battery voltage reaches 7.3V automatically, with no separate settings.
Power supply battery selection forT8FB: You can use the standard battery box to with 4 pieces
1.5V NiMH batteries for power supply, or use lithium batteries (2S/3S/4S) to supply power.
Note: When inserting the battery, please make sure the positive and negative poles are inserted
correctly. Since the T8FB has anti-reverse insertion function, if the positive and negative poles are
inserted reversely, T8FB will not be powered on, and the T8FB will not be damaged. So please
insert the battery correctly when the positive and negative poles are reversed.
1.3 R8EF Receiver
1.3.1 Receiver Mode and Signal Switch
The standard receiver packed with T8FB is R8EF, 8-channel receiver with PWM and SBUS/PPM
signal output supported.
Signal Working Mode
(1) PWM Working Mode: Receiver indicator is RED with all 8 channels output PWM signal.
1Earth Pole
2Null
3Voltage Input: 4.8-18V
4Output: PPM
5Input：RSSI
1
2
3
4
5

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(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.
Signal Switch between SBUS&PPM and PWM
Short press the binding button on the receiver twice within 1 second to switch the SBUS/PPM
signal to PWM signal.
1.3.2 Receiver Connection

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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 “ ”.
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 3.0V-15V. 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
① Keep 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.
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 Receiver contains some electronic components of high-precision. Be careful to avoid strong
vibration and high temperature.
⑥ 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. 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:
① Put the transmitter and the receiver close to each other in parallel (about 50 centimeters).
② Push the Power Switch to power on T8FB.
③ Power on the R8EF, the LED of R8EF will start flashing slowly.
④ There 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.

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⑤ When 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.
Check the binding tutorial here: https://www.youtube.com/watch?v=D2cwvloIMDM
Chapter 2 Parameters Setup APP
2.1 Mobile phone APP
2.1.1 Mobile Phone APP Installation
Android APP: Visit https://www.radiolink.com/t8fb_bt_app to
download the android APP to setup T8FB 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 in Apple store and then click it to download.
2.1.2 Mobile Phone APP Connection
Connection of both Android APP and Apple APP to T8FB are the same as below:
① When the installation of parameter setup APP is complete, push the power button to turn
on T8FB.
② Click to enter the APP, a message will pop out to ask for permission to turn on the
Bluetooth function.
③ Click CONNECT on the top left of interface, a list of devices will pop out for selection.
④ Select RadioLink device, the two LED indicators at rightmost will flash with DD sounds.

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⑤ Push 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 T8FB succeed.
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 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 Mobile Phone APP Parameters Setup Menu
Parameters setup of both Android APP and Apple APP are the same.
The setup menu includes: SERVO, BASIC, ADVANCE, PROG.MIX. After click PROG.MIX, there
are 4 PROG.MIX setting, SYSTEM, TH/CURE, DR/CURE, RESET. For detailed setting method, please
refer to 3.2 Basic Menu.

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The 8 rectangles show the CH1-CH8 servos range (4 basic channels and 4 auxiliary channels)
from left to right. CH1--Aileron, CH2 - Elevator, CH3 - Throttle,CH4--Rudder, CH5 to CH8 --
Auxiliary channels. You can push the joystick or switches to know which channel it is.
There are function keys on the top of the parameter setup interface.
(DIS)CONNECT: When APP is opened and T8FB 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
T8FB. 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 T8FB to the APP and re-write.
Note:
1. Click “WRITE”each time parameter is modified to make sure it’s well input to the T8FB. The
modified parameters won’t be saved if “WRITE”is not clicked.
2. If you want restore the factory default settings, please reconnect to the APP, and click "Reset".
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.
① Load 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.
② Create 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

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set up all the parameters depends on your drone, click “STORE”to save the settings,
“/mode/RacingDrone1.txt”pop out means the new model have set successful.
③ Delete 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. T8FB 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.
Note: Each interface can display the transmitter voltage, receiver voltage, RSSI signal strength
value, power battery voltage telemetry (when using R8FG, R7FG, R8F, R8XM receivers with
telemetry function)
CLOSE: Click “CLOSE”to exist the APP.
2.2 Software APP on Computer
2.2.1 Software APP Installation on Computer
Go to the official website https://www.radiolink.com/t8fb_bt_app 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://www.radiolink.com.cn/firmware/transmitter/T8FB(BT)/
or contact us by email at: [e-mail]
2.2.2 Software APP Connection on Computer
After the driver is installed, T8FB transmitter can connect to computer parameter software.
1Turn on T8FB 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 T8FB cannot be
detected, you could try another USB data cable. Do not use USB charging cable.
3T8FB will continuously make D sounds, press any of the 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
T8FB. 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 T8FB to the APP and re-write.
Click “WRITE”each time parameter is modified to make sure it’s well input to the T8FB.
* After modifying the parameters, please click to write data, otherwise the modification will be
invalid.
* If you want to restore the factory default settings, you can click "Factory Settings".
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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Note: Each interface can display the transmitter voltage, receiver voltage, RSSI value, and
telemetry battery voltage (Telemetry function is available when using R8FG, R7FG, R8F, R8XM
receivers ).
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 SUB-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. 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). 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.
The interface of parameter setup APP on phone.
The interface of parameter setup software on computer.
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 T8FB low voltage it will
cause loss of control. At this time, you can set the Fail-Safe, so that the model can maintain

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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.