[Elecraft] High Current only on 20 Meters

[Adrian]

Jim,  yes in you example ' Rs + j Xs)' I was referring to Rs, which I though
was the antenna resistance, and jXs the capacitive or Inductive reactance,
of which does not
consume any power, but effects the power factor (phase shift) acting on the
real antenna resistance. Which part did I misquote or misunderstand Jim, or
is Rs not the antenna resistance
under the conditions of measurement.  ?

Adrian ... vk4tux

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim Brown
Sent: Thursday, 5 March 2020 2:32 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] High Current only on 20 Meters

On 3/4/2020 8:15 PM, Adrian wrote:
> When I say radiation resistance I include the small copper resistance
also, which is negligible on this heavy copper wire delta loop.

An important part of my post was about using the right words to describe
physical reality. Radiation resistance is a characteristic of an antenna,
and can be used to compute antenna efficiency. That's NOT what you're
measuring. You are measuring feedpoint impedance (assuming you can connect
at the feedpoint AND that your measurement setup doesn't change the
impedance).

So please call it what it is -- the feedpoint impedance, which your analzyer
probably reports as Rs + j Xs). :)

73, Jim K9YC


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