Topband: Inverted L Matching Question

[George & Marijke Guerin]

George, etc.

If the coax run to the shack is not too long, I would ignor the SWR and 
bring in the coax feed and use an L-net tuner at the radio.  The Collins 
180T, The TenTec 229 and 238 tuners all should do the job, especially since 
extra shunt capacity can be added across the internal shunt capacity.

Alternately, if the stub is not working, I would look for many low value 
door knobs to put in parallel or some mica bath tub style capacitors.  Some 
of the manufacturers now use medium to high voltage disc ceramics of fairly 
low individual values in series to do phasing.    You might ask WX0B what he 
is using and where he gets his disc ceramics for phasing networks for 
4-squares, etc.

For a series capacitor to tune out inductive reactance, I would use a vacuum 
variable.

good luck,  73        George    K8GG

----- Original Message ----- 
From: "George McCrary" <k8qm at nc.rr.com>
To: <topband at contesting.com>
Sent: Tuesday, November 02, 2004 9:38 PM
Subject: Topband: Inverted L Matching Question


> All,
>
> I've got a Inverted L with about 45 feet vertical and 120 feet.
> I currently have about half the radials I need. When I put up the
> antenna last year I was able to get a decent match using a coax stub. It
> worked pretty well for a while, but at some point stopped presenting a
> good match.
>
> Is it evil juju to use a coax stub to match this antenna
> (especially since I can run a KW on 160)?
>
> If the coax stub is bad, does anyone have a good suggestion for
> an economical source for doorknobs?
>
> Thanks for any suggestions.
>
> George (K8QM)
>
>
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