> 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/xk.md).

# XK

## Details

**Protocol Number:**  62\
**Autobind:**  Yes\
**Channel Re-mapping:**  Yes\
**Extended Limits:**  No\
**Failsafe Support:**  No\
**Receiver Match:**  No\
**Telemetry:**  No\
**Option Value:**  X450 emulation mode and frequency fine tuning (see sub-protocol notes)

## Notes

**Models:**  XK X450 (TX=X8) and X420/X520 (TX=X4)

## Channel Assignment

| CH1 | CH2 | CH3 | CH4 | CH5                       | CH6                   | CH7                         | CH8   | CH9     | CH10  |
| --- | --- | --- | --- | ------------------------- | --------------------- | --------------------------- | ----- | ------- | ----- |
| A   | E   | T   | R   | <p>Flight</p><p>modes</p> | <p>Take</p><p>off</p> | <p>Emergency</p><p>stop</p> | 3D/6G | Picture | Video |

Flight modes: -100%=M-Mode, 0%=6G-Mode, +100%=V-Mode

CH6-CH10 are momentary switches

## Sub Protocols

### 0 - X450

**Models:**  XK X450 (TX=X8)

{% hint style="warning" %}
This sub-protocol is known to be problematic.  This is due to the emulation of the original radio's RF component.
{% endhint %}

If the model does not respond well to inputs, or is hard to bind, you can try to switch the emulation mode by using an option value (RF Freq. tuning) other than 0.

Once the value is not set to 0 it is used for frequency fine tuning.  See the [Frequency Tuning page](/using-the-module/frequency-tuning.md) for more details.

### 1 - X420 (TX=X4)

**Models:**  XK X420/X520

**Models:** X420 & X520