"Steve Nosko" wrote
With a "conjugate match" the source dissipates 50% of the power and the
load
the other 50%. This can't be changed.
=============================
Without disagreeing with what you say -

A conjugate match is not relevant in the present discussion because there is
seldom, if ever, a conjugate match between a PA and its antenna system.

The tuning-up process is NOT intended to produce such a match.

Tuning up is just the simple process of adjusting the transmitter load
resistance to be equal to its designed-for load resistance, usually an
arbitrary 50 ohms.

The internal resistance of a transmitter is NOT 50 ohms. It is not a design
feature. It is whatever happens to appear after the designer has met a
series of other requirements. The designer himself does not know what the
internal resistance is unless, out of curiosity, he bothers to measure or
calculate it.
----
Reg, G4FGQ

Reg Edwards wrote:
The internal resistance of a transmitter is NOT 50 ohms. It is not a design
feature. It is whatever happens to appear after the designer has met a
series of other requirements. The designer himself does not know what the
internal resistance is unless, out of curiosity, he bothers to measure or
calculate it.

Proving that, like 50/60 Hz AC power, efficiency may be
more important than maximum power transfer. Edison actually
thought that AC generators would burn up while trying to
deliver maximum power. That's why he backed DC.
--
73, Cecil, W5DXP

"Cecil Moore" wrote in message
...
Reg Edwards wrote:
The internal resistance of a transmitter is NOT 50 ohms. It is not a
design
feature. It is whatever happens to appear after the designer has met a
series of other requirements. The designer himself does not know what
the
internal resistance is unless, out of curiosity, he bothers to measure
or
calculate it.

Proving that, like 50/60 Hz AC power, efficiency may be
more important than maximum power transfer. ...
73, Cecil, W5DXP

That's also where I was going with my "raise the plate voltage" concept.
--
Steve N, K,9;d, c. i My email has no u's.

"Reg Edwards" wrote in message
...

"Steve Nosko" wrote
With a "conjugate match" the source dissipates 50% of the power and the
load
the other 50%. This can't be changed.
=============================
Without disagreeing with what you say -

A conjugate match is not relevant in the present discussion because there
is
seldom, if ever, a conjugate match between a PA and its antenna system.

The tuning-up process is NOT intended to produce such a match.

Tuning up is just the simple process of adjusting the transmitter load
resistance to be equal to its designed-for load resistance, usually an
arbitrary 50 ohms.

The internal resistance of a transmitter is NOT 50 ohms. It is not a
design
feature. It is whatever happens to appear after the designer has met a
series of other requirements. The designer himself does not know what the
internal resistance is unless, out of curiosity, he bothers to measure or
calculate it.
----
Reg, G4FGQ

Hi Reg,
This is another track, but one I've pondered, but probably shouldn't
now... And one that I believe has seen MANY words on NetNews, no? So I'll
put this out anyway and see what I get.

As we adjust the classical pi output network, I think we are starting
high and gradually lowering the load impedance seen by the tube, no? Start
with max C at the load cap and decrease it for max Po (keep in resonance
with the plate cap) I believe in the pi config. the BIG load "C" transforms
the load (50ohms) up to a "hi" Z seen by the plate. This may be wrong,
though I believe not, so will continue with the concept.
As we do this the power to the load keeps increasing up to a point. If
we keep going, the Po drops. So, we have reached the optimum Z as seen by
the tube. I think the question at this point is "why / what" is this the
"optimum" for?
I suspect the arguments are FOR and CON conjugate match.
I think it must be agreed that it is clearly the optimum for Po, no?
--
Steve N, K,9;d, c. i My email has no u's.