Jon:
Thanks for this. This has crossed my mind since I use hose clamps to attach
the wire from the top and bottom of the caps. I had used copper flashing
between the two caps. I'll change that to a heavy insulated wire. Get out
the NoAlOx too. :)
Thanks again.
73, Jamie
WB4YDL
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Jon
Zaimes AA1K
Sent: Thursday, January 30, 2014 3:21 AM
To: James C. Hall, MD; topband@contesting.com
Subject: Re: Topband: Bad tower shunt capacitor
Look closely and you may see a hairline crack on the bad one.
Also look for other possibilities. A number of times I've swapped out "bad"
matching capacitors without solving the problem, only to find later it was
simply an oxidized connection that needed to be cleaned up and tightened
down.
73/Jon AA1K
On 1/29/2014 7:26 PM, James C. Hall, MD wrote:
> I have an omega matched 120 foot tower and I apparently have a bad vacuum
variable capacitor. Upon applying more than about 300 watts, the SWR goes
off scale. Tuning it out and trying again, yields the same thing.
>
> The question is which capacitor is the culprit. These are surplus Soviet
caps obtained from the Ukraine and, as I recall, the larger value capacitor
is the parallel one, not the series one. I could buy one of each and switch
one at a time and have a spare left over. Any suggestions ?
>
> 73, Jamie
> WB4YDL
>
> Sent from my iPad
> _________________
> Topband Reflector Archives - http://www.contesting.com/_topband
>
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