Well like they say, you can't fix it if it ain't broke. Good deal. Funny how unterminated antenna's can interact with other systems. Much the reason for tieing up the loose ends at a communications site. Hope it never returns.
Mathew
"Bob M." <[EMAIL PROTECTED]> wrote:
First, I would like to thank everyone who responded to
my original post with suggestions, information, and
similar problems.
Here's an update to the situation.
Late Monday afternoon/evening, the coax/antenna was
swept (from the bottom) with a site-master unit and no
problem was found.
There's an unused 800 MHz vertical antenna mounted
near the UHF antenna, on the platform, with coax
attached. Apparently the dummy load at the bottom of
the coax for that antenna was either missing or
defective, so another one was put on. The repeater's
desense problem is completely gone now, even with the
200w PA and the 17dB gain preamp.
I don't know if there was desense immediately before
playing with that dummy load, nor if they restored the
situation to what it was previously to check if the
desense reappeared. For all we know, with the high
winds and rain we had Monday, something up at the
antenna (the jumper, for example) could have moved
enough to _cure_ the problem, even temporarily.
Nothing else was done at the site on Monday, but the
repeater is working as good as it was when it first
went on the air.
If the desense condition returns, we'll obviously have
to go looking for it again, but maybe a visit to the
top of the pole would be in order.
Anyway, my search for a circulator is temporarily on
hold. Sure, it would be desirable to have one, but not
absolutely necessary for proper operation of the
repeater.
Bob M.
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