How to Configure Analog Video Transmission Parameters
I. Principles
Analog video transmission (VTX) is used to overlay flight controller data, OSD information, etc., onto the FPV image, and control parameters such as VTX power and frequency band through the IRC Tramp or SmartAudio protocol.
ArduPilot supports multiple VTX protocols and can be configured based on the type of video transmitter used to ensure signal stability, adjustable VTX power, and avoid overheating issues.
II. Equipment Preparation
1) Flight Controller: Any of the SpeedyBee F405 WING APP / SpeedyBee F405 WING MINI / CoreWing F405 WING V2 flight controllers is applicable to this tutorial.
2) Ground Control Station: Mission Planner.
3) Video Transmitter: SpeedyBeeTX1600.
III. Specific Operations
Step 1: Enable Analog VTX
Search for the VTX_ENABLE parameter in the full parameter tree and set the value to 1.
Step 2: Configure VTX Protocol
ArduPilot supports two VTX control protocols: IRC Tramp and SmartAudio. Select the appropriate protocol for configuration.
🔹 Method 1: Using IRC Tramp Protocol
1. Set Serial Port Parameters:
The following parameters apply to SpeedyBee F405 WING APP / SpeedyBee F405 WING MINI:
| Parameter Setting | Explanation |
|---|---|
| SERIAL5_BAUD = 57 | Set IRC Tramp baud rate to 57600 |
| SERIAL5_OPTIONS = 4 | Set serial port 5 to half-duplex mode |
| SERIAL5_PROTOCOL = 44 | Set serial port 5 protocol to IRC Tramp |
The following parameters apply to CoreWing F405 WING V2:
| Parameter Setting | Explanation |
|---|---|
| SERIAL3_BAUD = 57 | Set IRC Tramp baud rate to 57600 |
| SERIAL3_OPTIONS = 4 | Set serial port 3 to half-duplex mode |
| SERIAL3_PROTOCOL = 44 | Set serial port 3 protocol to IRC Tramp |
2. Set VTX Power and Pitmode (Low Power Mode):
Important
These parameters are optional and can be set according to your needs.
| Parameter Setting | Explanation |
|---|---|
| VTX_MAX_POWER = 800 | Set maximum VTX power (in mW) |
| VTX_OPTIONS = 10 | Enable Pitmode to prevent overheating during ground testing |
3. Enable OSD:
| Parameter Setting | Explanation |
|---|---|
| OSD_TYPE = 1 | Enable analog VTX OSD |
🔹 Method 2: Using SmartAudio Protocol
- Set Serial Port Parameters:
The following parameters apply to SpeedyBee F405 WING APP / SpeedyBee F405 WING MINI:
| Parameter Setting | Explanation |
|---|---|
| SERIAL5_BAUD = 4 | Set SmartAudio baud rate to 4800 |
| SERIAL5_OPTIONS = 4 | Set serial port 5 to half-duplex mode |
| SERIAL5_PROTOCOL = 37 | Set serial port 5 protocol to SmartAudio |
The following parameters apply to CoreWing F405 WING V2:
| Parameter Setting | Explanation |
|---|---|
| SERIAL3_BAUD = 4 | Set SmartAudio baud rate to 4800 |
| SERIAL3_OPTIONS = 4 | Set serial port 3 to half-duplex mode |
| SERIAL3_PROTOCOL = 37 | Set serial port 3 protocol to SmartAudio |
- Enable OSD:
| Parameter Setting | Explanation |
|---|---|
| OSD_TYPE = 1 | Enable analog VTX OSD |
IV. Q&A
Q: What is Pitmode?
A: Pitmode (Low Power Mode) allows the VTX to run at extremely low power during ground debugging to prevent overheating and affecting normal operation.
It is enabled by default. To disable Pitmode, modify:
| Parameter Setting | Explanation |
|---|---|
| VTX_OPTIONS = 0 | Disable Pitmode |
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