[TowerTalk] RG-8/RG-213 as C in gamma match

[donovanf at starpower.net]

Peter,

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.

73
Frank
W3LPL

---- Original message ----
>Date: Sat, 29 Dec 2007 20:13:24 +0000
>From: Peter <pc2a at pi4cc.nl>  
>Subject: [TowerTalk] RG-8/RG-213 as C in gamma match  
>To: Towertalk List <towertalk at contesting.com>
>
>Hi
>
>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?
>
>Peter
>PC2A
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