Well, after a few months of agrivation, we have finally found the
trouble.
There is an internet and cellphone relay system on the tower as well
as the commercial FM transmitter. The problem was high speed data
being radiated at a very low level from the data line that runs from
the transmitter room up to the antenna on the Cellphone relay
system. The actual transmitter for this system is located at the
antenna so only data flows up the coax. Apparently they run very
high speed DIGITAL data on a coaxial line that runs up the tower leg,
RIGHT NEXT to our DB224. Thier data coax had a break in it about mid
section to our antenna.
I am not sure of the power level in the coax but the data frequency
is between 100 and 200 MHZ, very broad spectrum. It didn't take much
of a leak to completely blank our receiver when the source of the
leak was less than a foot from our antenna.
Once the coax was replaced, all is now quiet and normal. We found it
by using a specrum anaylizer and super sniffing.
I hope none of you folks ever have this sort of trouble, It kept us
scratching our head for over SIX months. The hardest thing about
finding it is that it was intermittent. Some days it was quiet and
others it was wiping out the repeater.
Thanks for all the suggestions
73's and Happy Hamming!!
Gary - W5GNB
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