On Tue, 25 May 2004 07:27:03 -0500, "Richard Fry"
wrote:
However careful measurement of heat production and AC power consumption of
broadcast txs (for example) does NOT support the belief that the source Z of
a tx designed for 50 ohm loads IS 50 ohms.

Hi Richard,

This quote above bears directly to one of my observations. You define
by negatives, and that is a shoddy technical discussion worthy of the
creationist argument.

Tell us what it IS instead. A simple complex number is all that is
asked, derived from actual measurement. I've done this numerous
times, and not simply for milliwatt signal generators and have
returned these readings to the client with certificates of
traceability to Primary Standards Labs.

Barring any explicit answer that yields this complex number; then that
answer is simply conjecture and illusion that is commonplace in this
discussion. Draping it with programs and formula doesn't give
substance to the shape of that dream.

73's
Richard Clark, KB7QHC

The source Z of a typical tx having a single-ended Class C PA is just a few
ohms. The exact value depends on circuit design and tuning adjustments.
Heavy loading of the output tuning network of the PA reduces the return loss
looking back into the tx, and lighter loading improves it.

Please read my post using the new subject line "Tx Source Impedance & Load
Reflections" that I started for this a few minutes ago. The paper I refer
to and quote there (not mine) is accepted in the broadcast industry as a
benchmark on this subject.

- RF
____________

"Richard Clark"
Hi Richard,

This quote above bears directly to one of my observations. You define
by negatives, and that is a shoddy technical discussion worthy of the
creationist argument.

Tell us what it IS instead.

On Tue, 25 May 2004 11:42:42 -0500, "Richard Fry"
wrote:

The source Z of a typical tx having a single-ended Class C PA is just a few
ohms. The exact value depends on circuit design and tuning adjustments.
Heavy loading of the output tuning network of the PA reduces the return loss
looking back into the tx, and lighter loading improves it.

Please read my post using the new subject line "Tx Source Impedance & Load
Reflections" that I started for this a few minutes ago. The paper I refer
to and quote there (not mine) is accepted in the broadcast industry as a
benchmark on this subject.

- RF

OK you cannot give us a specific answer derived from actual
measurement.

73's
Richard Clark, KB7QHC