Paul, there is a document somewhere showing S21 better (more accurate) results
to S11.
I need to look for that doc.
73,
Máximo EA1DDO
www.EA1DDO.es
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Paul
Christensen
Sent: domingo, 25 de diciembre de 2022 8:03
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Wireman W2DU Current Type Balun
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/
Paul, W9AC
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Jim Brown
Sent: Saturday, December 24, 2022 10:29 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Wireman W2DU Current Type Balun
On 12/24/2022 6:47 PM, Jim W7RY wrote:
> The 1:1 shown is exactly the same as Balun Designs. Except for the
housing.
Do you know that it's the same ferrite mix? That makes a huge difference, and
#31 the only one I've found that yields REPEATABLY good high Rs values at HF.
#43 and #52, which can provide high enough values, but they are much higher Q
than #31, so the wide mfg tolerances of all ferrite cores causes every one to
be different.
73, Jim K9YC
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