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Re: [TowerTalk] Measuring Common Mode Choke with Anritsu VNA

To: towertalk reflector <towertalk@contesting.com>
Subject: Re: [TowerTalk] Measuring Common Mode Choke with Anritsu VNA
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Tue, 2 Jan 2018 09:58:57 -0800
List-post: <mailto:towertalk@contesting.com>
Hewlett Packard''s app note on this topic is well known, and my own attempts at measuring high values of Z using S11 resulted in large errors.

73, Jim

On 1/2/2018 5:28 AM, Wes Stewart wrote:
You keep saying that and I keep directing you to Kurt's paper that shows this is incorrect.

http://hamcom.dk/VNWA/How%20to%20measure%20very%20high%20impedances-Deutsch%20DG3OK.pdf

On 1/1/2018 7:40 PM, Jim Brown wrote:

Avery,

Somehow I failed to clearly make the point that measurement errors associated with measuring high Z chokes with S11 is NOT a relatively small error, like 10%. It can be a VERY LARGE error, like 50-70% in resonant frequency. Which FAILS to allow assessment of suitability for use in a given frequency range.

73, Jim


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