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Re: [TowerTalk] Understanding Antenna Impedance Measurements

To: "'Jim Lux'" <jimlux@earthlink.net>,"'Jim Brown'" <jim@audiosystemsgroup.com>,"'Tower Talk List'" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Understanding Antenna Impedance Measurements
From: "Tod" <tod@k0to.us>
Date: Tue, 15 Nov 2005 15:38:28 -0700
List-post: <mailto:towertalk@contesting.com>
Jim (and Jim)

Those values look like they are within about 2% of expected values for the R
and within 20% or so on the X. Is the analyzer accuracy any better than that
if there is NO coax between the load and the analyzer?

Tod

> 
> I simulated the effect of about 218 ft of RG-8X (180 deg at 
> 1.85 MHz) with a load of 50+j20 ohms, at frequencies from 1.8 
> to 1.9 MHz.
> Frequency, MHz 1.8 1.82 1.84 1.85 1.86 1.88 1.9 R at load 50 
> 50 50 50 50 50 50 X at load 20 20 20 20 20 20 20
> 
> At the "antenna analyzer end" you get the following data:
> R at input 47.74 48.87 50.05 50.66 51.27 52.53 53.82 X at 
> input 15.68 15.98 16.21 16.29 16.36 16.43 16.41
> 

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