You may wish to check your sNp file. There could be an interpolation issue that is creating the discontinuity. I have seen such problems in "professional" SW like ADS and Microwave Office.
________________________________
From:
[email protected] <
[email protected]> on behalf of alan victor <avictor73@...>
Sent: Thursday, July 4, 2019 6:52 PM
To:
[email protected]Subject: Re: [nanovna-users] Strange peaks in S11 with load
Good day,
Ok, I just took a measurement after cal with the nanoVNA and then captured that data using their SW, There are two measurement .jpg attached. The first is their 50 termination after cal. Yes, nice cal. The second is a quality 50 ohm termination. Yes, the return loss at 900 MHz is about 18 dB. This is an issue that is part of another discussion. However, focus on your issue, I do not see their SW causing spikes in the data.
Alan
________________________________
From:
[email protected] <
[email protected]> on behalf of amirb <amir.borji@...>
Sent: Thursday, July 4, 2019 6:40 PM
To:
[email protected]Subject: Re: [nanovna-users] Strange peaks in S11 with load
no the OP, dk1vi, has his nanoVNA.
I am waiting on mine
On Thu, Jul 4, 2019 at 02:25 PM, alan victor wrote:
You are waiting on the unit to be shipped. So I assume this is a measurement
of another VNA using whose 50 ohm termination? Is the issue you are raising
the software or the hardware? I can input a touchstone file from another
instrument and a "good" 50 ohm termination and plot log mag s11 and see if I
detect spikes (due to interpolation?) in the plotted data.
Alan
________________________________
From: [email protected] <[email protected]> on behalf of amirb
<amir.borji@...>
Sent: Thursday, July 4, 2019 5:11 PM
To: [email protected]
Subject: Re: [nanovna-users] Strange peaks in S11 with load
this looks awful !
I am still waiting for mine to be shipped but this result got me
scared/disappointed :-(
