> For the complete documentation index, see [llms.txt](https://www.multi-module.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.multi-module.org/using-the-module/protocol-details/radiolink.md).

# RadioLink

## Details

**Protocol Number:**  74\
**Autobind:**  No\
**Channel Re-mapping:**  No\
**Extended Limits:**  Yes\
**Failsafe Support:**  Yes\
**Receiver Match:**  Yes\
**Telemetry:**  Yes\
**Option Value:**  Frequency fine tuning\
**Firmware Version:** v1.3.1.49 (v1.3.1.89 for DumboRC sub-protocol)

{% hint style="danger" %}
Frequency tuning is required for this protocol.  See the [Frequency Tuning page](/using-the-module/frequency-tuning.md) for more details.
{% endhint %}

## Notes

**Models:**  Radiolink air and surface receivers.

## Channel Assignment

| CH1 | CH2 | CH3 | CH4 | CH5 | CH6 | CH7 | CH8 | CH9     | CH10    | CH11    | CH12    | CH13    | CH14    | CH15    | CH16    |   |
| --- | --- | --- | --- | --- | --- | --- | --- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | - |
| CH1 | CH2 | CH3 | CH4 | CH5 | CH6 | CH7 | CH8 | FS\_CH1 | FS\_CH2 | FS\_CH3 | FS\_CH4 | FS\_CH5 | FS\_CH6 | FS\_CH7 | FS\_CH8 |   |

**FS:**  Failsafe

## Sub Protocols

### 0 - Surface

**Transmitters:** RC4GS, RC6GS\
**Compatible Receivers:**  R7FG (Std), R6FG, R6F, R8EF, R8FM, R8F, R4FGM, R4F\
**Firmware Version:** v1.3.1.49

* CH1 = Steering
* CH2 = Throttle
* CH8 = Gyro gain

**Telemetry:** RX\_RSSI (for the original value add -256), TX\_RSSI, TX\_QLY (0..100%), A1=RX\_Batt, A2=Batt/2 (adjust the ratio)

### 1 - Air

**Transmitters:** T8FB, T8S \
**Compatible Receivers:**  R8EF, R8FM, R8SM, R4FG, R4F\
**Firmware Version:** v1.3.1.49

**Telemetry:** RX\_RSSI (for the original value add -256), TX\_RSSI, TX\_QLY (0..100%)

### 2 - DumboRC

**Compatible Receivers:**  X6, X6F, X6FG\
**Firmware Version:** v1.3.1.89