Adjusting transmit power

Mission Planner way

See also

Ardupilot docs on doing this: https://ardupilot.org/copter/docs/common-configuring-a-telemetry-radio-using-mission-planner.html

In short:

1. Disconnect MP from the typical mavlink stream
2. Set the right com port and baud rate (but don’t connect)
3. Go to setup ⇒ Optional Hardware ⇒ SiK Radio
4. Click “Load settings”
5. Configure as needed & make sure to copy settings to remove before saving

Hayes command mode

If the Mission Planner way doesn’t work, then you can configure the radio directly using the Hayes AT command set.

See also

• GitHub issue reporting MP not working: https://github.com/ArduPilot/MissionPlanner/issues/3439
• ArduPilot docs on doing this: https://ardupilot.org/copter/docs/common-3dr-radio-advanced-configuration-and-technical-information.html#using-the-at-command-set

1. Disconnect mission planner (close it for extra good measure) to release its lock on the serial port
2. Connect to the radio directly using your favorite terminal emulator (mine is minicom for purposes like this)
   1. Make sure the connection is set to 57600 baud, 8N1 option
3. Send +++ to enter Hayes mode
4. Send ATS4=n, where n is the transmit power you want (in dBm; default seems to be 20 on 500mW Holybro sets)
5. Send ATS&W to save parameters to EEPROM
6. Send ATO to exit command mode
7. Unplug / replug the radio

See also -- AT command set

For more info on why the AT command set is the “AT” command set, see the Ancient Lore page, particularly “AT autobauding code details.”

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