There are several message threads about this. Since you have not grounded the Nanovna, you are part of the antenna system and where and how you hold the device will change its readings.?
Search for: antenna near field
/g/nanovna-users/message/5796?p=,,,100,0,0,0::Created,,+field+antenna,100,2,0,37711267
On Sat, 22 Aug 2020 at 8:10 AM, C Gosch via groups.io<ch.gosch@...> wrote: Hi all,
I'm new to the nanovna and VNAs in general.
I got a nanoVNA-H4 recently and was playing with measuring a few antennas
(SWR and reactance) to find my way around.
I noticed that the measurement was depending very much on where the VNA was
located, and where my hands were located relative to the VNA.
I expected that to be true for the antennas themselves, i.e. when I touch
the antenna or come close to it, measurements will change.
But the measurements were e.g. changing extremely when I put my hand on the
side of the nanovna opposite from the SMA connectors.
Is that expected behaviour? Is there some form of shielding in the
enclosure?
I got the device from a reputable dealer in the US who was claiming these
are "validated to be good production models"? (whatever that means).
Any hints?
