NanoVNA V2 / Forum

Note: this page is a mirror of https://groups.io/g/NanoVNAV2.
Click here to join and see most recent posts.

USING THE NANOVNA AND SAVER TO MEASURE CM ATTENUATION THROUGH CMCs


Dragan Milivojevic 2021/02/02 17:39

A very nice tutorial but this is only half of the story.
For example, the attached S21 chart would suggest
that this is a decent choke but examine the second chart.
[image: image.png]

[image: image.png]



On Mon, 1 Feb 2021 at 23:01, David Eckhardt <davearea51a@gmail.com> wrote:

David Eckhardt 2021/02/02 17:25

Dragan:

I have not seen a way to plot the second chart. Please let me know and
I'll take a look at my chokes in that respect. The dotted lavender line in
the second plot looks like series resonance somewhere near 7.5 MHz.

Dave - WØLEV

On Tue, Feb 2, 2021 at 4:39 PM Dragan Milivojevic <d.milivojevic@gmail.com>
wrote:

> A very nice tutorial but this is only half of the story.
> For example, the attached S21 chart would suggest
> that this is a decent choke but examine the second chart.
> [image: image.png]
>
> [image: image.png]
>
>
>
> On Mon, 1 Feb 2021 at 23:01, David Eckhardt <davearea51a@gmail.com> wrote:
>
>> I promised this, so here it is. See the attachment for a procedure to
>> measure the CM attenuation through CMCs and other 4-terminal devices (as in
>> s-parameters). Comments and improvements are welcome before I post it to
>> the files section.
>>
>> Dave - WØLEV
>>
>>
>>
>
>

--
*Dave - WØLEV*
*Just Let Darwin Work*

Dragan Milivojevic 2021/02/02 18:37

It's a SimSmith graph, I have attached the circuit and the S file that was
used:

[image: image.png]





On Tue, 2 Feb 2021 at 18:25, David Eckhardt <davearea51a@gmail.com> wrote:

To reply to this topic, join https://groups.io/g/NanoVNAV2

View this thread on groups.io