I guess a little discussion of semantics is in order. Yes, EZNEC shows for
example, that a 12 AWG wire, 102' long and say 50' above avg ground shows an
impedance of ~98 +j0 at 14.32 MHz, so it is resonant in the 20-meter band,
because the reactance is zero, and it could be called a "resonant dipole.".
However, It also shows resonances at 4.61, 9.45, 18.74, 23.92 and 28.40 MHz. In
common ham jargon as I called it, this length would not be considered a resonant
dipole for those frequencies other than 4.61 MHz where it is one half wavelength
long.
But if someone wants to call it a 20-meter dipole, be my guest.
On 8/4/2016 3:22 PM, Fred Jensen wrote:
Ummm ... my HP48GX says 102' is very very close to 3 half-waves at 14 MHz
which sounds sort of resonant-ish. Maybe a little known bug in my calculator?
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