Any of the NANOVNAs are well suited to make your desired measurements: SWR
and R ± j X.
Minimum or 1:1 SWR is not a good indicator of resonance, regardless of ham
"lore" and misinformation. The DEFINITION of antenna or lumped element
circuit resonance is the frequency at which the complex portion of the
impedance becomes zero leaving only pure resistance. Addressing an
antenna, this resistance is a combination of resistive losses in the system
and the radiation resistance of the antenna. SWR, alone, is incapable of
indicating that condition as SWR is a scalar measurement (amplitude
measurement only with no phase information). The total impedance
expression requires a vector measurement of the impedance which also
expresses the complex portion, the ± j X term.
Dave - W?LEV
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On Sun, Jan 19, 2025 at 7:14?PM Peter Jones via groups.io <jonesypeter=
hotmail.com@groups.io> wrote:
Greetings,
I've recently completed the construction of my first 'home brew' antenna
(1/4 wave vertical). A radio friend of mine suggests I should look at
resonance as well as SWR.
SWR is fine, but I can't see anything online about an R/X chart (similar
to that available on the RigExpert).
Can I do this on the NanoVNA V4?
Thanks
Peter M0LMG
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*Dave - W?LEV*
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Dave - W?LEV
