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Hi Rudi
I do not think there is anything required to add/change for the calibration settings.
There are several possibilities for the deviation you see above 800MHz.
1. Did you use a male SMA to N female adaptor directly fitted to the SMA female adaptor for Ch0 ?
2. Did you before using the NanoVNAuser ensure the NanoVNA was correctly calibrated directely at the NanoVNA Ch0 female adaptor with the supplied calibration kit ? and did a sweep og a 25 to 50cm SMA test cable show better result
3. The test cable is probably too long and shall be a N type cable with no adaptors fitted
4. You NanoVNA has a poor bridge as NanoVNA as far as I know has no internal error correction
There is probably more reasons and it would be better if you explained in details you setup
Kind regards
Kurt

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Sendt: 19. oktober 2019 19:30
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Emne: Re: [nanovna-users] The Male Calibration Kit for AliExpress

Hello Kurt,
I have tried to apply your calibration paper.
I have connected 50 cm RG402 coax cable to the Reference Plane.
The nanoVNA-saver has an additional calibration with 5 segments.
Please see the attached nanoVNA-saver screen capture:
nanoVNA-saver_50cm-RG402-open.png

What can I enter in the window Calibration->Calibration standards in order to improve the measurement?
73, Rudi DL5FA