Expand description
Audio control methods.
Controls AF (Audio Frequency) gain (band-indexed) and VOX (Voice-Operated Exchange) settings for hands-free transmit.
§D75 tone commands
The D75 firmware RE originally identified TN, DC, and RT as tone commands. Hardware testing revealed their actual functions:
- TN: TNC mode (not CTCSS tone)
- DC: D-STAR callsign slots (not DCS code)
- RT: Real-time clock (not repeater tone)
CTCSS tone and DCS code are instead configured through the FO (full frequency/offset) command’s channel data fields.