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# Vtx (UORB message)

**TOPICS:** vtx

## Fields

| Name        | Type        | Unit [Frame] | Range/Enum | Description                                                    |
| ----------- | ----------- | ------------ | ---------- | -------------------------------------------------------------- |
| timestamp   | `uint64`    |              |            | time since system start (microseconds)                         |
| protocol    | `uint8`     |              |            |
| device      | `uint8`     |              |            |
| mode        | `uint8`     |              |            |
| band        | `int8`      |              |            | Band number (0-23), negative values indicate frequency mode    |
| channel     | `int8`      |              |            | Channel number (0-15), negative values indicate frequency mode |
| frequency   | `uint16`    |              |            | Frequency in MHz, zero indicates unknown                       |
| band_letter | `uint8`     |              |            | Band letter as ASCII                                           |
| band_name   | `uint8[12]` |              |            | Band name in ASCII without null termination                    |
| power_level | `int8`      |              |            | Current power level (0-15), negative values indicate unknown   |
| power_label | `uint8[4]`  |              |            | Current power label in ASCII without null termination          |

## Constants

| Name                                                              | Type    | Value | Description                               |
| ----------------------------------------------------------------- | ------- | ----- | ----------------------------------------- |
| <a id="#BAND_NAME_LENGTH"></a> BAND_NAME_LENGTH                   | `uint8` | 12    |
| <a id="#POWER_LABEL_LENGTH"></a> POWER_LABEL_LENGTH               | `uint8` | 4     |
| <a id="#PROTOCOL_NONE"></a> PROTOCOL_NONE                         | `uint8` | 0     | No protocol is detected, usually an error |
| <a id="#PROTOCOL_SMART_AUDIO_V1"></a> PROTOCOL_SMART_AUDIO_V1     | `uint8` | 10    |
| <a id="#PROTOCOL_SMART_AUDIO_V2"></a> PROTOCOL_SMART_AUDIO_V2     | `uint8` | 20    |
| <a id="#PROTOCOL_SMART_AUDIO_V2_1"></a> PROTOCOL_SMART_AUDIO_V2_1 | `uint8` | 21    |
| <a id="#PROTOCOL_TRAMP"></a> PROTOCOL_TRAMP                       | `uint8` | 100   |
| <a id="#DEVICE_UNKNOWN"></a> DEVICE_UNKNOWN                       | `uint8` | 0     |
| <a id="#DEVICE_PEAK_THOR_T67"></a> DEVICE_PEAK_THOR_T67           | `uint8` | 20    |
| <a id="#DEVICE_RUSH_MAX_SOLO"></a> DEVICE_RUSH_MAX_SOLO           | `uint8` | 40    |
| <a id="#MODE_NORMAL"></a> MODE_NORMAL                             | `uint8` | 0     |
| <a id="#MODE_PIT"></a> MODE_PIT                                   | `uint8` | 1     |

## Source Message

[Source file (GitHub)](https://github.com/PX4/PX4-Autopilot/blob/main/msg/Vtx.msg)

::: details Click here to see original file

```c
uint64 timestamp # time since system start (microseconds)

uint8 BAND_NAME_LENGTH = 12
uint8 POWER_LABEL_LENGTH = 4

uint8 PROTOCOL_NONE = 0              # No protocol is detected, usually an error
uint8 PROTOCOL_SMART_AUDIO_V1 = 10
uint8 PROTOCOL_SMART_AUDIO_V2 = 20
uint8 PROTOCOL_SMART_AUDIO_V2_1 = 21
uint8 PROTOCOL_TRAMP = 100
uint8 protocol

uint8 DEVICE_UNKNOWN = 0
uint8 DEVICE_PEAK_THOR_T67 = 20
uint8 DEVICE_RUSH_MAX_SOLO = 40
uint8 device

uint8 MODE_NORMAL = 0
uint8 MODE_PIT = 1
uint8 mode

# Band and Channel are 0-indexed! But the user expects a 1-indexed display!
int8 band        # Band number (0-23), negative values indicate frequency mode
int8 channel     # Channel number (0-15), negative values indicate frequency mode
uint16 frequency # Frequency in MHz, zero indicates unknown

uint8 band_letter   # Band letter as ASCII
uint8[12] band_name # Band name in ASCII without null termination

# Also 0-indexed, but the user expects a 1-indexed display!
int8 power_level     # Current power level (0-15), negative values indicate unknown
uint8[4] power_label # Current power label in ASCII without null termination
```

:::