R12F Introduction

RadioLink R12F, 12-channel receiver, 2.4G FHSS spread spectrum algorithm and 67-channel pseudo-random frequency hopping, supports PWM, SBUS and CRSF signal. It is high voltage servo supported and can get the new functions by updating the firmware. R12F is compatible with RadioLink T16D/T12D/T8FB/T8S/RC8X/RC6GS V3/RC4GS V3/RC6GS V2/RC4GS V2/RC6GS/RC4GS transmitters.

Note: Please do the following safety check before operating your model:

（1）、RSSI test (Received Signal Strength Indicator). For test method, please refer to the manual Chapter 7. RSSI Testing.

（2）、Antenna inspection: The gray line on R12F is coaxial cable, while the transparent line with a length of about 4-5 centimeters at the top is antenna. If the transparent line is broken or damaged, it will directly affect the control distance. If any abnormality is found, please replace the receiver antenna in time.

Receiver Protocol Selection

If R12F is used together with T16D/T12D, please select receiver protocol in the transmitter. Enter Transmitter Setting--RF SETTING,and then select the protocol. R12F supports FHSS V1, FHSS V2 and FHSS V2.1 protocol. It is recommended to select FHSS V2.1 protocol. For the differences of the protocols, please refer to the table below:

Binding

Each receiver has an individual ID code and must bind with transmitter before using. When the binding is done, the ID code will be stored in the transmitter and there is no need to rebind. Therefore, when a new R12F is purchased, binding needs to be done in order to work with transmitter.

Binding steps:

1. If T16D/T12D/RC8X transmitter is used, select the receiver protocol in the transmitter. For T16D/T12D transmitter, you also need to make sure you have select Internal for MODULE SELECTION, as shown on the right. (Please refer to Chapter 2. Receiver Protocol Selection) Note: If you are using a transmitter other than 16D/T12D/RC8X, such as RC6GS/RC4GS/T8S/T8FB, etc., go to step 2 directly.
2. Put the transmitter and the receiver close to each other (about 30 centimeters).
3. Turn on the transmitter and the receiver, and the LED of R12F will start flashing slowly.
4. 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.
5. 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.

Note: When the transmitter and receiver are powered on, if binding fails or the signal is lost, the LED of the receiver will keep flashing to notify.

Working Modes

R12F supports three signal outputs: PWM, SBUS and CRSF. It has four working modes in total.

R12F working modes setting:

（1）Turning on/off the SBUS: Short press the binding button once to turn on/off the SBUS. Blue LED indicates the SBUS is turned on, and channel 12 outputs SBUS signal.

（2）Turning on/off the CRSF: Short press the binding button twice within 2 seconds to turn on/off the CRSF. Green LED indicates CRSF is turned on. Channel 10 receives RX and channel 11 outputs TX.

Introduction of the four working modes:

（1）PWM working mode

Red LED always on indicates PWM signal output, 12 channels in total.

PWM+SBUS working mode

Red and blue LED always on indicates PWM+SBUS signals output.

CH1 to CH11 output PWM signal output while CH12 outputs SBUS signal.

（3）PWM+CRSF+SBUS working mode

Red, green, and blue LED always on indicates PWM+CRSF+SBUS signals output.

CH1 to CH9 output PWM signal, CH 10 receives RX, CH11 outputs TX, and CH12 outputs SBUS signal.

（4）PWM+CRSF working mode

Red and green LED always on indicates PWM+CRSF signals output.

CH1 to CH9 output PWM signal, CH 10 receives RX, CH11 outputs TX, and CH12 outputs PWM signal.

Firmware Update

R12F supports firmware upgrade. The steps for firmware upgrade are as follows:

1. Plug a Type-C cable into the Type-C port of R12F.
2. Press and hold the binding button of R12F.
3. Plug the other end of the Type-C cable into the computer and release the binding button.
4. The LED of the receiver is on, and a USB flash drive appears on the computer.
5. Copy and paste the new firmware of R12F into the USB flash drive to complete the update.

Antenna Installment

It is important to install the receiver antenna correctly on the model, because wrong receiver antenna installation will cause poor signal quality.

How receiver antenna installation affects signal quality? Here are the common mistakes when installing the antennas:

1. Antennas should NOT be placed near metal objects, because reflection of the conductor panel will drastically worsen the signal.
2. Do NOT keep antennas parallel to the ground. It should be placed vertically to the ground.
3. Big models may contain metal parts that influence signal emission. In this case. antennas should be positioned at both sides of the model to ensure the best signal status in all circumstances.
4. Antennas should be kept away from metal conductor and carbon fiber at least half inch away and no over bending.
5. Keep antennas away from motor, ESC or other possible interference sources.
6. Sponge or foam material is advised to use to prevent vibration when installing receiver.
7. Receiver contains some electronic components of high-precision. Be careful to avoid strong vibration and high temperature.
8. Special vibration-proof material for R/C like foam or rubber cloth is used to pack to protect receiver. Keeping the receiver in a well sealed plastic bag can avoid humidity and dust, which would possibly make the receiver out of control.

Refer to the following link to view the guide on receiver antenna installation:

https://www.radiolink.com/newsinfo/886600.html

RSSI Testing

（1）If the control distance is short, please refer to this instruction to test the RSSI between the transmitter and receiver. This instruction will introduce the test procedure of the transmitter RSSI value and the solution to the abnormal RSSI value.

Turn on the transmitter and power on the receiver at the same time, and then the transmitter and receiver will be connected (if not connected, you need to bind again). The signal tower appears on the transmitter interface, indicating that the binding is successful. The value of RSSI will appears on the home page, and the RSSI value will keep changing according to the distance between the transmitter and the receiver. (As shown on the right)

（2）Make the receiver antenna and transmitter antenna parallel. Keep transmitter apart from receiver about 30 centimeters and both antennas straight. It is normal that RSSI value is within the range of 0 to -30dBm. The closer the value is to 0, the stronger the signal is. (As shown below)

Abnormal signal strength solution:

Check whether the antennas of the receiver and transmitter are damaged. Most signal strength degradation is caused by antenna damage. If it is damaged, the antenna needs to be replaced. If there is no damage, you can test the transmitter and receiver for malfunctions by replacing the receiver. If still cannot solve the problem, email to after_service@radiolink.com.cn to get support.

Subsidiary ID (Take T12D transmitter as an example)

RadioLink transmitters can bind with multiple receivers. When T12D and multiple receivers have been bound successfully, and T12D and all successfully paired devices are turned on at the same time. There are two ways to use them:

1. When Subsidary ID function is turned off, T12D can control multiple devices at the same time.

2. When Subsidary ID function is turned on, T12D can control the specified device according to the selected Subsidary ID. T12D has 16 groups of Subsidary ID functions, and each ID corresponds to a receiver. Set the Subsidary ID first. When all the devices are turned on, you can control one of the devices through the Subsidary ID function. At this time, the other devices are on standby.

For example: Bind T12D with a truck and a car and turn all them on. First, use T12D to control the car to run to the bucket of the truck, and then switch the receiver ID on the truck to drag the car back to the destination.

Subsidary ID function setting steps:

1、Turn on Subsidary ID function. Then set the ID number according to your models and then finish the binding and parameters set for each receiver.

2、Once the Subsidary ID is turned on, the corresponding ID number will be displayed on the main interface of T12D.

Note: You can assign a 2 position switch or 3 position switch to change subsidiary ID number in T16D/T12D transmitte. For more details, please refer to the CONDITION function of T16D/T12D.

R12F Specifications