[TowerTalk] T-match vs Gamma-Match Trade-off

Tom Rauch w8ji at contesting.com
Sun Dec 5 15:09:22 EST 2004


> Over a fifteen year period, I had numerous problems
running
> 1500 watts into gamma matched Yagis, including an incident
> where a feedline on a 10 meterYagi arced to the boom about
> 8 feet from the driven element, a 40 meter feedline that
arced
> to the tower leg about 30 feet from the driven element,
and at
> least two capacitors that arced on the 40 meter Yagi.

All of the above observations absolutely parallel the thing
I saw with my first and only gamma matched Yagi.

Obviously there is considerable common mode on the boom and
feedline shield.

I wonder if any pattern plots were ever made of gamma
matched yagis. Anyone know of any?



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