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[TowerTalk] Coax caps

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Subject: [TowerTalk] Coax caps
From: (Chris Burger)
Date: Thu, 26 Jul 2001 09:22:30 +0200
N4ZR asked:
>Is it feasible to use coaxial cable as the series capacitor in a shunt feed
>system, simply pruning the length of cable as appropriate?  Or is there
>some reason why not?

No problem, within the voltage rating of the coax.  

Just don't cut the end off bluntly.  Strip the braid back by perhaps 20 mm
(or 3/4" if you insist), and sleeve it with heat shrink sleeve.  If you
simply cut the end, it will arc over when you run power.  Also, you may want
to keep the "cap" away from tower legs etc.; the jacket's breakdown voltage
is not the greatest.

I used such caps in a shunt fed tower for a few years.  The only problems
were related to charring when touching the tower, and to the end charring
because of arcing.

Chris R. Burger

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