There are multiple ways to do this. Many radios (Icom, and maybe others) output
an analog voltage that tracks frequency bands. You can decode this with an
analog level detector to drive relays. Top Ten makes (made?) relay boxes and
decoders for this.
Another approach is to use a computer logging program. Many of these (N1MM and
others) can look at the radio's frequency and output the Top Ten code on the
parallel port, which can be used to drive antenna relays. N1MM allows you to
map the frequency to the antennas, even having multiple antennas per band which
can be selected.
-Tony, K1KP
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