Hi Jim,
Happy Christmas.
Regarding the test jig, Are you still using that one made of Teflon board with
short coax tails to the D8SAQ ?
Thanks
73,
Máximo EA1DDO
www.EA1DDO.es
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Jim Brown
Sent: domingo, 25 de diciembre de 2022 10:05
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Wireman W2DU Current Type Balun
Hi Paul,
I made S21 measurements using a test jig quite similar to Steve's. His
measurement technique seemed quite good. The (major) shortcoming of his work is
that he measured only chokes on only a few cores, failing to understand the
contribution of production tolerances to reproducible designs.
A limitation on the precision of my data is that my fixture had to allow
measurement of many hundreds of chokes on many cores, not a few.
73, Jim K9YC
On 12/25/2022 12:02 AM, Paul Christensen wrote:
> Jim (K9YC),
>
> When making Rs measurements are you using the S11 or S21 method?
> Steve, G3TXQ was an advocate of S21 while Owen, VK2OMD claims S11
> results in better accuracy with high Rs values.
>
> I've been using S21 with G3TXQ's VNA adapter on a PC board. It's
> shown at the bottom of the page in the link below:
>
> http://www.karinya.net/g3txq/chokes/
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