The Collins S-line is not exactly ham band only. If you have enough
crystals you can have any 200 kHz, I think, of Hf spectrum between 3.4
and 30 MHz except for 5 to 6.5 MHz.

Using a remote RF gen with programmed steps instead of the xtals is
possible with only minor modification, I think. But perhaps an internal
synth would be possible, and could be made quiet enough to not detract
from the superb performance, better than most synthesized icoms and so
forth.

I'm told that for specific 200 kHz swaths, a 75S or KWM is a much
better receiver than the 51S-1, which has a very promiscuous front end.


Any thoughts?