[hpsdr] Antenna selection

[Bob Cowdery]

I'm just working out how to code up the antenna switching. I was looking
at PowerSDR to see what it did. I've not checked the code and I can't
test it as my Alex isn't hooked in yet so was wondering if someone can
enlighten me on how it works. It looks like PowerSDR allows both Antenna
1-3 and an RX only input to be selected so how does it know which one to
use or is it just done on priority i.e. R1/2/XV if selected else 1/2/3.

73 Bob G3UKB