Topband: Mother of all ferrite common-mode coaxial chokes

[ZR]

----- Original Message ----- 
From: "Richard (Rick) Karlquist" <richard at karlquist.com>
To: <jim at audiosystemsgroup.com>
Cc: <topband at 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