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NanoVNA H4 attenuator reading jumping
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u666sa:
I have NanoVNA H4, with SD card, version 4.3, bought it from here, it's the real thing, not fake. Firmware as from Hugen 1.2.27, I upgraded it to DiSlord 1.2.40, behavior did not change.
Basically, after calibration, when two cables connected together, I'm measuring -759 umdB to 515 umdB (and prior to firmware upgrade it was showing 0 dB to -0 dB).
Then I insert 20 dB 25W attenuator, and I'm getting values jumping like so..... -20.55 dB, -20.54 dB, -20.56 dB. It stays mostly on -20.55 dB.
Then I insert 30 dB 2W attenuator, -30.05 dB, -30.02 dB, -30.01 dB, -30.03 dB, -30.04 dB.
What's going on? What's up with jumping?
Then, if I decide to use these attenuators in TinySA Ultra to measure power, I also have power jumping. For example TID-RADIO H3 is jumping from 5.5 watts all the way to 6.1 watts. |O
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