use nanovna_app instead :-)
dg9bfc sigi
Am 22.11.2024 um 16:49 schrieb Antoine (F4LVL) via groups.io:
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On Fri, Nov 8, 2024 at 06:24 PM, William Schrader wrote:
It's called "NanoVNAs Explained for the Radio Amateur:
So I bought the book following your advice and it's actually really good, I understood a lot more about the nanoVNA reading it.
Sadly the only part that was really interesting for me was not really clear.
Since then I received my test board so I just tried to do some measurements a bit randomly.
Here's what I did (once calibrated) I connected my trap to the center of S21 and S11 and I got what's on image A.
I'm I correct assuming that |Z| represent the width of frequency that are filtered by my trap and that the change in phase represent the frequency where my trap is tuned ?
For image B I did almost the same measurements but only using S11. ( so one channel) |Z| looks the same (is it the other way to measure it ?) but Q (is it Q factor of my filter) is not the same at all.
I don't really know if I'm doing everything wrong or if I'm on the good track ?
And I also used the method were I pass a wire through the toroid and the frequency was not that far from what I measured with the methods above.
(sorry for the bad picture I still didn't figured how to install nanovna saver...)
