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Re: Cushcraft 738XB



My KLM 2 m antenna has a circuit board relay switch - basically unprotected.
The foil connection totally coroded itself out.  I solved it by hard wiring
the connections on the board - it' a very simple circuit.  Then I slopped
silicone over the whole thing.  The 440 switch is in a box and has given me
no trouble.

Mal, NP2L
St. John, USVI
----- Original Message -----
From: <jbblack@mindspring.com>
To: AMSAT-BB <amsat-bb@AMSAT.Org>
Sent: Sunday, January 16, 2000 9:50 AM
Subject: [amsat-bb] Cushcraft 738XB


> Am wondering if anyone else on the reflector has this particular 70cm
> antenna.  I hadn't been on the satellites in a while when, on Christmas, I
> noticed that the FO birds and AO-27 were hard to receive.  I kept noticing
> this phenomenon hoping it would get better.  Granted, I've got lots of
> trees, but even in the summer, I could hear well.  Now, all of a sudden,
my
> operation has gone to 0 due to the fact that I cannot hear.
>
> Yesterday, I climbed my short tower (23') and removed the switchbox on the
> antenna.  I had sealed it with silicon to keep water out.  While I was
> taking the screws out, however, I noticed that there was a proliferation
of
> rust on the screws themselves.  Once I got the box apart, I noticed a
white
> powdery substance all over the circuit board.  I am wondering if this came
> from the dessicant packages I placed in there to keep moisture out or if
the
> dessicant packages failed and water got in there and corroded some
circuits.
>
> I haven't fully taken the switchbox apart yet waiting for Tuesday when I
can
> get it on the bench and de-solder the RF and DC connections on the board
and
> spray all of it with contact cleaner.
>
> I wonder if it just wouldn't be better to circumvent the box and feed RF
> directly to the driven elements.  Any suggestions?
>
> Thanks es 73,
> Joel
> -----------------------------------------------------------------------
> OM:  Joel B. Black, K2SAT     XYL:  Kristie H. Black, KF4CHN
> Eutaw, AL...............EM62       kahblack@mindspring.com
> AMSAT member #32589
> AMSAT Local Area Coordinator
> www.mindspring.com/~jbblack
> jbblack@mindspring.com
> k2sat@amsat.org
> AO-10, AO-27, FO-20, FO-29
> UO-22, KO-25
>
>
>
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