I am trying to do some tuning of band filters. I am using the nanovna-H with release 0.6.0 and in combination with nanovna-saver.
It came to me that the filter characteristics were not quite what was expected and therefor I tested some cables to be used. Indeed some cables were old and gave a lot of attenuation and so I made some new hyperflex cables with new BNC connectors.
After calibration I expected to see a flat line of 0 dB on the S21 gain chart for the through setting for the whatever attached cables. The result should be straight line, but it is not.
On the contrary I see a wavy chart through the spectrum dependent on the type and length of cable this looks like a mismatch between on the S21 port. (See the attached figure for the submitted sma cable.) It seems that the correction figures after calibration are not applied correctly.
Is this normal, a hardware fault or a software issue?
I am trying to do some tuning of band filters. I am using the nanovna-H with release 0.6.0 and in combination with nanovna-saver. It came to me that the filter characteristics were not quite what was expected and therefor I tested some cables to be used. Indeed some cables were old and gave a lot of attenuation and so I made some new hyperflex cables with new BNC connectors.
After calibration I expected to see a flat line of 0 dB on the S21 gain chart for the through setting for the whatever attached cables. The result should be straight line, but it is not.
On the contrary I see a wavy chart through the spectrum dependent on the type and length of cable this looks like a mismatch between on the S21 port. (See the attached figure for the submitted sma cable.) It seems that the correction figures after calibration are not applied correctly.
Is this normal, a hardware fault or a software issue?![S21 gain (just a coax direct connection)](https://user-images.githubusercontent.com/12565830/103583841-c1714980-4ee0-11eb-9fcc-09f12bb9df4e.png)