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[TowerTalk] DRIVEN VERSUS PARASITIC 160 antenna

Subject: [TowerTalk] DRIVEN VERSUS PARASITIC 160 antenna
From: Dennis OConnor <>
Date: Wed, 4 Jan 2006 05:06:09 -0800 (PST)
List-post: <>
Well, remotely adjustable elements would allow the optimizing of gain and f/b 
across the band for a parasitic array....  It is certainly doable even on 160, 
but is it necessary?  
On 160 I rarely go above 040, or so... QSY over 40kc is not that hard to have 
both gain and f/b stay good (not perfect, of course)...  In the rare 
circumstance that I might want to go higher I know that the gain and f/b are 
When I want to go higher up in the band AND keep the gain and f/b, I walk out 
to the arrays and remove one or more of the clipped on tips which retune the 
array elements in 50kc steps...  Not very elegant, but really cheap and 
I have actually cobbled up on the bench, an air powered knife switch to to 
remotely control the element length... It works just fine, is not sensitive to 
the high voltage RF fields at the ends of the elements, and is not too 
expensive (relative term)... At this point in time I have no great urge to go 
that that expense and work just for convenience... For a flagship M-M contest 
station, the expense is justifiable...

Certainly, the driven 4 square arrays can be retuned with relays and 

denny - k8do

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