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Zmag complex impedance under S21

By EA1DDO •  2017-02-07 01:43:07 •  363 clicks
Hi WuXiao,
In order to measure a complex impedance from a RF choke or balun, we need to use the S21 mode. Then, under S21, you can select Loss, Phase or delay, so to know the impedance from a choke you need to export the S21 file and use an external application (Excel) to do some maths and get the complex impedance.
You can see what I am talking about in next link:

http://www.karinya.net/g3txq/chokes/#measurement

I wonder if someone can add one more S21 format "Zmag" to perform those measurements without external maths.
Here is the spreadsheet with the calculations:

http://www.karinya.net/g3txq/chokes/s21_calcs.ods

(OpenOffice file, but opens with Excel as well).

I think it is easy to add and you get an nice new feature.

Thank you

73, Maximo
3 Reply | until2017-05-27 12:11Add a reply
    BG8NPK  38 days ago#1 -Reply

    @EA1DDO
    That's great, thanks for you contribution this calculator but we don't have a balun to test.

    I will try to make one


    EA1DDO  43 days ago#2 -Reply

    Hi all,
    I have got ready a simple Excel spreadsheet to upload the S21 and S31 exports from the KC901V/S and calculate Common Mode Rejection Ratio and some other imbalance calculations for any balun.
    Please, have a try and let me know.
    Regards, Maximo.

    http://bbs.deepace.net/uploads/file/201704/20170414025638_12049.zip


    EA1DDO  95 days ago#3 -Reply

    Hi WuXiao,
    Any response or update on this matter?

    I am asking because I am working at present with some toroids and baluns and it seems no one VNA has this feature included.
    Since it is a simple maths operation, I understand that it could be easily implemented in a new firmware update.
    Then you would get a new nice feature, not present in other VNAs.
    Please, let me knoe your thoughts.
    Thank you
    73, Maximo


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