Ok.
We all agree free space theoretical resonance would be something like 9.35 MHz.
We also agree closer to ground would lower fundamental resonance to something lower, like 9.125 or so.
But I have not seen an answer as to why he sees three resonances, two of which are below Fo. In my experience this may be due to common mode current, which when cleared with a suitable choke, yields a single resonance.
Of course I can understand more resonances (x= 0 zero crossings) at half-waves at higher frequencies.
But could someone take another shot at why he is seeing resonances at 4.6, 6.5 and 7.2 MHz on an an antenna cut for 9 MHz?
And, true to the advice of calibration at the far end of the feedline, can¡¯t he ALSO calibrate at the VNA connector, and walk-back along the Smith Chart, or otherwise subtract the effect of the coax feed with a reasonable chance of accuracy?
Ed McCann
AG6CX
