The
Plains Repeater operated for many years
without a single problem. Suddenly we
developed Power Amplifier problems. We
were burning out PA's like candy. The
SWR was showing 4 Watts reflected and
that is without even having a
transmitter connected. "Again". Sadly
trying to find out what is causing this
has become a real pain in the Coax. Our
antenna was built for this Repeater and
has near FLAT MATCH.
The
System operated for years ++ at 100
Watt's Output and not a single problem
as mentioned. Those that have used or
listened to the "System" know the
repeater at times was in [Full Transmit]
for hours and hours.
I
personally don't want to point fingers,
But I do believe we are getting Voltage
that is getting back into the PA [Last
Stage] and overtime this is what {Must}
be causing the System to Fail. We also
would receive a RF Burn from the Coax
and this is yet another symptom of the
RF being generated from another users
Close Proximity of their antenna and the
147.140 antenna.
Anderson
Broadcasting was very helpful in helping
us to eliminate some of this RF. Their
Tech, Tony Mulligan built a special
filter for the receiver. Yet the RF
coming down the coax was probably from
their KERR RADIO new install at
Patrick's Knob.
Recently, We upgraded the system to a
MSF-5000 Motorola and special thanks to
Don W7MRI he in the newer system was
able to install 2 Circulators providing
-70db of isolation on the transmitter
that I believe our problem is solved. We
still had an interfacing problem which
finally has been corrected.
Again thanks to the help of
Don W7MRI from Helena. The Repeater
is UP on the AIR as well as the Link's
to Cut Bank's K7HR Mount Baldy Repeater
146.700- PL-103.5 and the
changeable 15 channel UHF Remote Base
system. Thank you all for your patience.
I again would like to thank Bonneville
Power for the last ride up the Mountain
to complete the interfacing.
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