RG-8 will work very as a gamma match capacitor on a 40 meter Yagi. If
you can get the correct size aluminum tubing, you can simply insert the RG-8
dielectric into the gamma tube. I did this for many years
with my full size 40 meter Yagis, until I converted the matching to
T-matches. I still have three 20M Yagis that a gamma match fed, and
they work very well.
---- Original message ----
>Date: Sat, 29 Dec 2007 20:13:24 +0000
>From: Peter <firstname.lastname@example.org>
>Subject: [TowerTalk] RG-8/RG-213 as C in gamma match
>To: Towertalk List <email@example.com>
>In preparation to build a new 40 meter beam, I'am searching
>possibilities to make the matching C
>Normally in a smaller beam We using 2 different diameter of aluminum
>tube with an isolated tape between them
>But a gamma match for 40 meter will be in the 2-3 meter range. Due wind
>the match will be slight moving in and out and for long term will this
>be a point of failure.
>I was thinking if it was possible to make the C from RG-8 With the
>100pf/meter it will be 3-5 meters long.
>I can make first with a air varible C the match to find the exact value
>of the C.
>Is this done before?
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