Date: Sat, 10 May 2008 18:11:47 -0700
> From: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
> Subject: [TenTec] Measuring High Impedances
> To: "Ten Tec List" <tentec@contesting.com>,
> "geraldj@storm.weather.net" <geraldj@storm.weather.net>
> Message-ID: <20080511010947.00DA7589DA@gw1.nlenet.net>
> Content-Type: text/plain; charset="us-ascii"
>
> Jerry,
>
> If you haven't already done so, have a look at the measurement
> issues that I've raised in the Power Point file below.
>
> http://audiosystemsgroup.com/NCDXACoaxChokesPPT.pdf
>
> Then take a look at
>
> http://audiosystemsgroup.com/Toroid61Data-2.pdf
>
> Virtually any reflection-based measurement (i.e., S11) will
> give you VERY wrong answers for those chokes wound on #61 (and
> also for the higher frequency coax chokes on #31 cores). It IS
> practical to get good data using S21 (i.e., as the series
> element of a voltage divider.
>
> The Q-meter is fine instrument, but not many folks still have
> one or know how to use one. As the Power Point shows, my
> voltage divider technique is able to get pretty good data for
> some pretty high Z parts with instrumentation of modest cost.
>
> 73,
>
> Jim K9YC
>
>
3
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