At 4/23/2006 17:58, you wrote:
>There must have been a large metallic wall or screen between his 2
>antennas for his repeater to work without degradation with 25'
>horizontal separation. Or else he had an amazing radio that
>transmitted over 50dB less sideband noise and a front end made like a
>crystal filter.
One of my first repeaters (a Canadian Marconi, my only all-tube repeater)
used two antennas about 50 ft. apart horizontally & 10 ft. vertically. One
of the two antennas was a quagi nulled into the other omni antenna. Only
filtering I had available was one pass cavity, which I placed on the
TX. It barely worked: no desense but only if the quagi was perfectly
nulled into the omni.
Based on this experience, I'd say two omnis 25' horizonally & vertically
separated using solid-state equipment probably wouldn't work without
considerable desense.
Bob NO6B
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