It tunes transmit and receive. If you tune ok it will just beep once when its
done indicating no errors and tuning finished.
Which mode you use on the 6m band depends where you are on the band. There are
Morse, sideband, and fm areas of the band.
Tom
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html