On Thursday 12 May 2005 01:57 pm, DCFluX wrote:
> Has anyone had desence due to the fact that the repeaters
> antenna is too close to the repeater its self? Like 12
> feet of vertical seperation and 2 feet horizontal?
I don't know about your MASTR II base station (per later
post) but I had problems with a repeater which I had built
and a close antenna. The antenna was positioned almost
exactly as yours is, perhaps a couple of feet higher. The
repeater was 'homebrew' (sort of) but I had been extremely
careful with shielding and filtering in construction of the
repeater itself - rx, tx, and controller in separate
compartments, each fully shielded with filters on all leads
in and out of each compartment. All interconnecting cables
outside the box were mil spec double silver shield RG-214
and feedline was RG-214 later changed to LDF4-50A. I could
not run more than 20 watts without desense. I never did
figure out how the desense was occurring. Once the antenna
was relocated (50 feet vertical and 20 feet horizontal) I
could run 100+ watts with no problem.
My repeater elmers had warned me that physically close
antennas might be a problem...
Paul
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