Re: Connect Antenna Trap to NanoVNA


Jerry Gaffke
 

Correction to an obvious error:
Parallel tuned is a high impedance at resonance.
Jerry, KE7ER

On Tue, Sep 29, 2020 at 08:36 AM, Jerry Gaffke wrote:


I would probably test a parallel tuned trap as a single port, with the far end
of the trap grounded.
Should see the impedance head towards zero at the resonant frequency.
But could also be done as a 2 port measurement, loss approaching zero at the
resonant frequency.

You will find that the resonant frequency will change when the trap is part of
an antenna.
So do a single port test of the completed antenna, that's the real test.
Could be displayed as impedance, SWR, Smith Chart, whatever you are
comfortable with.
Look at each band individually, sweeping all of HF may not give enough
resolution to see resonances.

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