On 18 mayo, 17:26, Cecil Moore wrote:
On May 18, 9:41*am, Wimpie wrote:

Applying Cecil's rules, you and I are bad engineers/designers, ...

Are false assertions really necessary or helpful?
--
73, Cecil, w5dxp.com

Hello Cecil,

You keep on luring us (and others) into non-relevant discussions.
Snippet from your posting to Tom:

From the time (t0) that a PA first outputs a Zg signal to the time
(t1) that the PA senses its load impedance is NOT zero time. How does
the PA know what its load impedance really is when it is not Zg?
Einstein's spooky action at a distance? No, feedback from the load.

Obviously, the PA receives some sort of feedback in real time. What is
the nature of that feedback? What can it be besides feedback energy
reflected from the load? (not in zero time, but at the speed of
light). In the real world, it takes measurable time for the forward
energy to reach the load and measurable time for the reflected
feedback (if any) to arrive back at the PA. The load seen at the PA
source is always an E/I ratio, i.e. a lossless image impedance that
always experiences a delay if it is not equal to Zg, i.e. it usually
contains reflected energy.

There must be some (for us hidden) reason to do this.

We are discussing near steady state sinusoidal signals, so amplitude
and phase can only vary slowly (if not, other amateurs would not be
happy with you). Especially in case of manual load pulling, it doesn't
matter when there is a back and forth delay of 100 us (that is 10 km
of coaxial cable!!). All such delay actions are fully covered by the
concept of impedance (and steady state transmission line theory). We
are not discussing wide band systems where a reflected signal may be
uncorrelated with the actual output signal.

Wim
PA3DJS
www.tetech.nl