Topband: Homebrew capacitors

Richard Karlquist richard at
Mon Sep 30 21:37:33 EDT 2013

On 2013-09-30 17:57, ZR wrote:
> In the late 60's I made a coaxial capacitor from a length of RG-17 to
> supply most of the C for a 40M Bobtail. A little too big to fold and
> the losses were not even worth thinking about.
> On 160 with a decent coax what would be the effect of a little loss
> besides a little heat ?
> Carl
> KM1H

If the coax is very large, as in this example, or is very short,
or the circuit Q is low, you might get away with such a long
skinny capacitor, especially since it is a good heat sink.
However, there are other cases where the losses become a problem.
As the saying goes, YMMV.


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