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[TowerTalk] Force 12 80M Sigma vertical problem

Subject: [TowerTalk] Force 12 80M Sigma vertical problem
From: Dennis OConnor <>
Date: Fri, 21 Nov 2008 05:21:53 -0800 (PST)
List-post: <">>
Steve, Moxon in his book on HF Antennas For All Locations brings up this 
subject and he later revisited it in his ARRL article on assymetric fed 
I have done some tinkering with assymetric fed halfwave antennas and I have 
found that you need a big choke at the feed point and another choke 1/8 
wave away (for the band that detunes the most) and the feed line HAS to run at 
right angles away from the antenna for at least a quarter wave at the lowest 
affected frequency, and a half wave is better...  Most mommas won't put up with 
a neck high coax running across the backyard for her to duck everytime she 
hangs out the wash... Luckily for me, I can put my experiments away from the 
Anyway, Moxon's article is also in the Antenna Compendium #3  (or maybe #4 - I 
have Al Whatsizname disease)

denny / k8do


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