Re: [amsat-bb] KLM Antenna relay

["MCGWIER ROBERT" <rwmcgwier@xxxxxxxx>]

Dave:

Be very happy you live in Cal.  for this antenna.
I replace that relay here on the east coast
(acid rain, big changes in temperature and
humidity levels), even with extra protection on it,
FIVE TIMES in 7 years.   The second time I
had one fail, I ordered two and always kept
an extra on hand for the inevitable failure.

The relay itself performed well (little insertion
loss) to be such a likely point of constant failure.

Bob

----- Original Message ----- 
From: "Dave Guimont" <dguimon1@san.rr.com>
To: <amsat-bb@AMSAT.Org>
Sent: Friday, December 29, 2000 3:07 PM
Subject: [amsat-bb] KLM Antenna relay


> Several people in the past few months were looking for a replacement
> for a KLM 22C antenna relay.
> 
> Look no longer...Performance of my 22C on the O10 downlink has been
> deteriorating gradually, and I finally took the antenna down, and
> investigated.
> 
> 
> With the poor quality relay supplied it is a wonder it lasted the
> twelve years or so it was up there!
> 
> If I ever knew how it was connected to the antenna, I had forgotten,
> but when I traced the circuit it became readily apparent that it is
> nothing more than a double throw single pole relay to change
> polarity.  The one supplied is double throw, double pole, but two of
> the poles are not used...
> 
> I just replaced it with a junk box relay, hard wired, and my antenna
> performance on O10 is better than it ever was.
> 
> Even if yours is still working you may be advised to inspect it.
> 
>             73, Dave wb6llo@amsat.org
>                     Disagree: I learn....
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