[Wrtc] Frequency swap

[Stavros Tsiakkouris, 5B4AFM]

> Sending $MYCALL after QSY would be a great feature but it also needs
> lots a checks which are very dependent of the hardware. It is necessary
> to know, at least if radio QSYed on right band/mode and if
> antenna/amplifier/filters are switched/ready to use.

>From the s/w point of view, as long as it can confirm that the band/mode
swap is successful, this should be sufficient. Proper switching of the
antennas/amplifier/filters can be managed by adjusting PTT delay and
providing an appropriate hardware configuration.

73, Stavros 5B4AFM