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[TowerTalk] array matrix measurements

To: "towertalk" <>
Subject: [TowerTalk] array matrix measurements
From: "Rudy Severns" <>
Date: Fri, 13 Feb 2009 09:16:57 -0800
List-post: <">>
I've made these kinds of matrix measurements several times since I got my 
hands on a VNA.  It's not too hard and actually a lot of fun.  I've found 
that if I've been careful, the reciprocal measurements are usually within 1% 
or better.  This holds true even when the values themselves are really 
strange, as they can be when there's a parasitic radiator coupling into the 

Usually I do the measurements using only impedance measurements which is 
very straight forward but occasionally I'll use the transmission mode and a 
current transformer to do a direct measurement of coupling.  Both ways seem 
to work fine as long as I pay attention to the details.

73, Rudy 


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