Mark,
The very simplest way to do SO2R with one port is to switch the serial port
between radios. You can buy a serial switchbox for $2.00, use one of the
several unused connections to switch keying and/or the mike. You can have a
memory voice or keyer that switches opposite the active radio so that you can
call CQ on the run radio while chasing mults.
It sounds a little difficult, but really is quite simple. I used a computer
switchbox for a while, but then built the whole thing into my station master
interface. I switch between radios with a micro toggle switch on my remote
tuning control box, and a series of relays inside my interface box switches
everything back and forth between radios.
Paul, K5AF
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