To: <topband@contesting.com>
>Date: Fri, 31 Oct 1997 20:07:21
>To: towertalk@contesting.com
>From: Phil Clements <philk5pc@connect.net>
>Subject: Cheap Capacitors for Shunt-fed Towers
>
>I have been using teflon dielectric coax cable for my gamma and shunt
capacitors for
>years here. I use small variable caps from old A.M. broadcast radios and
low power
>(MFJ-259) to get a match initially. This gives me a starting point for the
length of
>coax I will need to substitute for each variable capacitor. The coax is
about 30pf per
>foot. Of course you need to err on the long side a bit so the coax can be
pruned to the
>right length. When a match is achieved, I strip back the outer cover and
braid about
>an inch, and insulate the end with electrical tape. There can be high
voltage at the
>open far end of the coax, so take precautions. I then coil up the coax and
put it in
>a plastic water-proof box used for sprinkler system timers available at
most hardware
>stores. Regular RG-8U could be used if you are not going to run QRO.
>
>(((73)))
>Phil, K5PC
>
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