Hi. A local UHF repeater is having massive desense
problems. Everything is clean with a dummy load
attached to the duplexer, so we know it's a problem
with the connectors, coax, antenna, or jumper between
the two. This is a two-month-old system at a cellphone
site; nothing else there. The repeater is the only
thing on 444.5 MHz.
I'd like to try a circulator before buying one, since
if it doesn't help the situation, it's a waste of
money to have it there. I would agree however that its
presence would be mandatory if this was a busy site,
but for now it's just his repeater and all the
cellphone equipment.
He's running 200 watts out of a Henry amp, through a
TxRx 4-section duplexer. We see a 20dB rise in the
noise level at the Rx port when the transmitter comes
on, with the system connected to the coax/antenna.
Absolutely no change with a good dummy load attached
to the duplexer's output. We even have desense with
the 20 watts out of the exciter (power amp bypassed).
The antenna is a super stationmaster cut for the
440-450 band. The coax is 7/8 and there's about 150 ft
of it.
So if someone has a circulator and reject load that
would be rated for 200 watts to pass through it,
please contact me. If there's a way we could try it,
and buy it if it helps the situation, that would be
ideal.
Thanks.
Bob M.
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