[TowerTalk] CM Choke

[Máximo EA1DDO_HK1H]

Yes, that is what i meant; short open load through.

But to be able to test different chokes, I use a couple of short cables with alligators. I can´t do the SOLT with those alligators, so I guess that fixture will affect the measure.

If I save a trace sorting the alligators, and then I apply "New trace minus trace in memory" that seems to give better accuracy on results, isn´t it?


Thanks


73, Maximo


________________________________
De: Richard (Rick) Karlquist <richard at karlquist.com>
Enviado: viernes, 13 de octubre de 2017 17:41
Para: Máximo EA1DDO_HK1H; Wes Stewart; towertalk at contesting.com
Asunto: Re: [TowerTalk] CM Choke



On 10/13/2017 9:52 AM, Máximo EA1DDO_HK1H wrote:
> Beginner question;
>
>
> My Anritsu VNA has the option to save in the memory a trace and then it
> can perform basic trace maths (minus, plus, etc).
>
> What if...  I do the full S21 two ports SOL calibration, then, still
> with the testing fixture connected I connect TX to Rx ports (short) and
> I save that trace.

I'm not sure what you mean by "full s21 two ports SOL calibration".
This requires "SOLT" meaning short open load through".  Maybe that is
what you meant.  Full error correction as offered by modern professional
grade network analyzers is much better than trace math techniques.
This is according to the world class experts I used to work with at
Agilent.  The old HP 3577 network analyzer had trace math instead of
real error correction.  It was better than nothing 30 years ago, but
was inferior to the real thing.

Rick N6RK