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Re: [TowerTalk] K9AY loops-- phased

To: Jim Jarvis <>,,
Subject: Re: [TowerTalk] K9AY loops-- phased
From: Pete Smith <>
Date: Tue, 19 Dec 2006 10:35:03 -0500
List-post: <>
I have modeled some phased K9AY loops, and found that 180 degree phasing with 
loops facing (receiving) the same way, at 130-foot spacing gave some 
interesting results, in terms of a narrower pattern with better F/S and RDF 
roughly like a 1.5 wavelength Beverage.  The phasing is a lot simpler than a 
4-square.  I used one of these pointed NE last year with good results, though 
I've never used a good Beverage so I don't know how it compares.  I'd be happy 
to share the model with anyone who wants it.

I have designed, but not yet built a 4-way array using 3 K9AY loops - two 
single plane (bidirectional) and one of the traditional 4-direction type, on 
two adjacent sides of a 130-foot square.  I notice that SP9P speaks of modeling 
results - perhaps he would be willing to share his model in either EZNEC or 
NEC-2 format, and we could draw our own conclusions.

The original K9AY article speaks of compromise terminating resistor values for 
80 and 160.

73, Pete

 At 08:02 AM 12/19/2006, Jim Jarvis wrote:

>Joe, SP9P's report on the sp3key quad-phased K9AY loops is
>interesting, and prompts questions.
>1)  Has anyone modelled this?  What is the resulting 
>pattern, in any one direction?
>2)  I would assume that the pattern is tightened, and f/b
>improved.  Does this result in front-side coverage holes?
>3)  My crossed AY loops worked ok...and had deep nulls, but
>only very seldom did an offending station land in one.  As
>a result, I concluded that ONE AY loop, rotatable, was better.
>    Is that same effect noticed at sp3key club?
>4)  The discussion doesn't talk about frequency.  Yet the loop
>terminations need to vary, to optimize performance at 3.5 or 1.8.
>What provision is made for 'tuning' the loop termination?  
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