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Re: [TowerTalk] Coaxial Moxon

To: Dan Zimmerman N3OX <>, <>
Subject: Re: [TowerTalk] Coaxial Moxon
From: "David J. Sourdis" <>
Date: Tue, 5 Aug 2008 01:39:26 -0500
List-post: <">>
Thank you Dan, 

Interesting article and it says it all.


Date: Sun, 3 Aug 2008 21:07:07 -0400
Subject: Re: [TowerTalk] Coaxial Moxon

A quarter wave coax, shorted at the end shows an infinite impedance.Is it 
possible what is described in the link?

A coax just a little bit shorter than a quarter wave shows a VERY quickly 
changing inductive reactance ... so you can change the stub length +/- a few 
centimeters and find the exact value of reactance you need to load the antenna.

But, it's VERY lossy to operate a stub near resonance as a reactance.  I 
estimated something like Q = 1 or Q= 5 for the "quarter wave" (actually a 
little shorter) stubs in that antenna, and a model of it seemed to suggest that 
the gain would be *negative 10dBi* and it would have zero F/B ratio.

You might look at as well.


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