----- Original Message -----
From: "Richard (Rick) Karlquist" <richard@karlquist.com>
To: <jim@audiosystemsgroup.com>
Cc: <topband@contesting.com>
Sent: Friday, July 13, 2012 9:46 PM
Subject: Re: Topband: Mother of all ferrite common-mode coaxial chokes
>
> Another thing you can do to measure chokes accurately is
> to simply use a Vector Impedance Meter instead of a network
> analyzer. Like the HP 4815A. In essence, it uses the VI
> method, as the name implies. It doesn't care if the
> impedance is nowhere near 50 ohms. For really high
> impedances, it can be helpful to mathematically subtract
> the stray capacitance of the probe. I've gotten excellent
> results with my 4815 for years.
>
> Rick N6RK
Thats what I used at work in the 80's to measure, seemed to correlate well
with the expected attenuation.
Ive also had one at home for about 20 years.
Carl
KM1H
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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