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Hi qrp.dd
Incorrect, that is not a measurement of the CH1 input impedance. The cable between Ch0 and Ch1 create impedance transformation. You need to calibrate at the end of the test cable with a female kit. If done at the end of the test cable with the female female adaptor fitted and then use the male calibration kit you are getting closer, but still as you have removed the female female adaptor you measure inside th NanoVNA, as the measurement plane now is different than the calibration plane, and shifted inwards with a distance equal to the delay/offset equal to the delay of the female female adaptor.
Kind regards
Kurt

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Sendt: 22. september 2019 09:12
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Emne: Re: [nanovna-users] RX-Port Input Impedance

yes, my NanoVNA CH1 also has VSWR=1.3 at 900 MHz. You can measure it by connect CH0 to CH1 with a good quality and short cable.