Topband: alternative feedpoint capacitor

[n0tt1 at juno.com]

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 at 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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