On 6/23/2011 5:59 AM, Cecil Moore wrote:
On Jun 22, 7:52 pm, John wrote:
A 50 ohm, non-reactive/carbon load would complicate matters, so
naturally, I am assuming that is NOT the case ...

IMO, the resistor load simplifies things as a single-port analysis can
be used on a resistor because there is only one component of power
accepted by the resistor. What would complicate things, IMO, is a 50
ohm antenna feedpoint impedance which is a virtual impedance.
Analyzing the antenna as a multiple port device shows where the
multiple energy components go which is a complication of the present
point I am trying to make about the Z0-match point 'x'.

However, the single-port vs dual-port analysis differences at the
impedance discontinuity 'x' also apply to the analysis at the load
resistor vs an antenna AND at the source where Walt seems to be using
a single-port analysis involving a virtual source impedance which
depends for its very existence upon forward and reflected energy
components flowing in opposite directions at the source impedance
point which necessarily causes interference accompanied by a
redistribution, not a reflection, of energy components.
--
73, Cecil, w5dxp.com

But cecil, with a 50 ohm NON-inductive load (not inductive over all
freqs of concern), fed by 50 ohm line, from a 50 ohm source ... would
find a stub a bit of a problem ... indeed, a shorted stub more so --
choice of proper line length and placement of the stub would allow its'
use, on very limited frequencies, with excellent dummy load results, but
the need, ever, escapes me!

Anyway, I just commented to **** old dave off ... :-) I admit it!

Regards,
JS