On 9/7/20 1:58 PM, David Eckhardt wrote:
Jim Lux, as usual, did a very credible explanation of what is going on -
far better than I could! Second order differential equations are the key
to understanding.
I'd like to add a practical point: Again, understanding resonance is,
indeed, defined as the frequency at which the complex portion of the
impedance goes to zero yielding only resistance. That is gospel! However,
let's completely *disconnect* the concept of SWR from resonance.
and one might want to disconnect "resonance" from "radiation efficiency" - a 10 meter long dipole (resonant at around 15 MHz) will efficiently *radiate* over a huge range of frequencies, probably down to 4-5 MHz and up to 100 MHz, in the sense of efficiency as "power pushed into the antenna"/"power radiated into the far field".
