> PS - With work, I was able to model tower-mounted antennas
> for 10M, using two-element colinears for both transmit and
> receive, that achieved 70 dB isolation at 400' vertical
> spacing. When I improved the model of the tower to account
> for other hardware, guy wires, etc., not so much. It might be
> a useful application on 6M.
I've seen a 10m single-site repeater work (100 kHz split) with 300 feet of
vertical separaton between antennas (single half-wave dipoles). The Tx was
a Micor with tube amplifier running 1/3 kW, Rx was a Maxtrac. No additional
filtering. No desense. I was suprised to see it work, and wouldn't have
believed it unless I saw it. Of course, the site noise floor may have been
elevated a bit which would have masked some desense...
Glad we're all on the same page now :-)
--- Jeff WN3A
