That seems like it has more to do with measurement repeatability than quality of the load.
Peter
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On 8/4/2019 1:16 PM, jimcking@... wrote:
I read -70 dB also on two different NanoVnas. Ch0 LogMag @ 50 KHz using the 50 Ohm load that came with the NanoVna. This is the same 50 Ohm that was used in the calibration. The calibration procedure assumes the load to be perfect so return loss shows 70 dB. It goes up with Frequency but is always better than -50 dB.
Jim K.
