The S11 minimum return loss does not indicate resonance.? Common mode current can affect the value and thus the SWR and mislead you when you are not measuring at the antenna.Only J0=0 indicates resonance.??
Mike W9MDB
toggle quoted message
Show quoted text
On Friday, October 14, 2022 at 07:00:17 AM CDT, Donald S Brant Jr <dsbrantjr@...> wrote:
If you just need to tune an antenna "on frequency" you do not even need to calibrate your VNA; it will show the S11 return loss dip at the correct frequency; the magnitude will be wrong but it is not relevant in this case, you are only looking ofr a minimum.? I do this when tuning my loop antenna and it works fine.? At HF, the error intorduced by adding an adapter after calibration is small.?
73, Don N2VGU
