[Antennas] coax 'sweet lenght'

[Dan Richardson]

At 04:38 PM 10/10/2004, Ron wrote:
>   If you want to measure the match between an antenna and it's feed line, 
> measure it at the antenna's feed point, to measure it 1/2 wl (electrical) 
> (or multiples of) away from it is the next best place to measure it.

That is correct, however, the impedance magnitude is the same at 
½-wavelength (or odd multiples thereof) but, if there is a reactive 
component, the sign will be opposite. For it to exactly be the same 
impedance with the correct sign (angle) the feed line must be 
one-wavelength or multiples thereof.

73,
Danny, K6MHE