I know someone who uses aluminum plates with
HDPE plastic to make a fixed capacitor. Works great
with 1.5kw on Topband. Formulas to get the cap in
reasonably close is in most ARRL RA handbooks. Tweek
with a capacitance meter.
73,
Charlie, N0TT
On Sun, 2 Aug 2015 18:10:57 -0600 "Steve Flood" <kk7uv@bresnan.net>
writes:
> My top-loaded vertical needs a series 260pF capacitor at the
> feedpoint to
> match the 53 + j335 impedance (1.825 MHz) to my coax feed.
>
> I have a few different air-variables I could use, but I was
> wondering what
> sort of fixed capacitors would be suitable in this application.
>
> Max power is 1500w. I have doorknob caps but they don't have
> current
> ratings marked on them.
>
>
>
> Thanks,
>
> Steve KK7UV
>
>
>
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