I was thinking that such fluctuations seen in NanoVNA were due to
swinging of my multi-band fan dipole in the wind! That would change the
relative nearness of elements to each other and nearby structures.
Jon, VU2JO
On Wed, Apr 2, 2025 at 4:33?AM W0LEV via groups.io <davearea51a=
[email protected]> wrote:
If you have a close-by strong source of RF energy like FM or AM
broadcasters, police, ambulance, CB'ers, hams, ....... any of those and
more could be affecting the readings. This is not all that uncommon in
cities when the VNA is connected to a large antenna.
Dave - W?LEV
On Tue, Apr 1, 2025 at 7:51?PM kellogs via groups.io <mihai0226=
[email protected]> wrote:
Is it normal for the readings to fluctuate as much as 2-3 ohms ? As in
11+/-1.5 - j(70+/-1.5)
Dipole NMHA (antenna), balun, calibrated, two ferrites: one at the balun
and one at the VNA S11 port. No body / coax inadvertent movements,
everything taped down near the antenna.
Thanks
--
*Dave - W?LEV*
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Dave - W?LEV
