Hi John,
thank you very much, and thank you for the kind description in your linked
post :-)
I assume you've calibrated on the NanoVNA? Or did you make an
in-application calibration? Either should be fine, of course.
Could I ask you to send me an exported S2P file of the data, please? I
would like to check how it looks.
I haven't previously seen a 10dB drop, and judging by the photo of the
filter on test, it doesn't show up on the NanoVNA itself. Can you verify
for me that it does not?
Thanks for reporting the problem!
--
Rune / 5Q5R
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On Thu, 26 Sep 2019 at 15:00, John AE5X <ae5x@...> wrote:
[Edited Message Follows]
Rune, many thanks for developing this software and making it available to
us all. It *greatly* increases the enjoyment of using and learning the
nanoVNA.
I went through the full 2-port cal yesterday and then used the
device/program to graph the response of a band reject filter. I'm wondering
why, after the cal routine, the S21 line is at a -10 dB level? I don't see
a way to zero it prior to making a measurement, so all the data relating to
any measurement will have a 10dB error...or perhaps I'm missing a step?
Thanks again and 73,
John AE5X
