RadioBanter - View Single Post

Owen Duffy · June 17th 08, 06:37 AM posted to rec.radio.amateur.antenna

(Richard Harrison) wrote in news:20731-
:

Owen Duffy wrote:
"Richard stated "It produces no significant harmonics, so the system is
linear." It is that with which I disagree."

A clear statement. Congratulations. Too bad it is wrong.

Terman wrote:
"Amplitude distortion exists when the modulation envelope contains
frequency components not present in the modulating signal."

Fine.

It is also true that absence of of harmonics is proof of linearity,

That is not a logical implication of your quote from Terman, it is
entirely your statement, and without splitting hairs over the absolute
meaning of 'absence', it is wrong when applied to a Class C amplifier
with pure sine wave excitation and a resonant load.

The converse is not logically equivalent to the original.

...
I challenge you to prove a mistake in Terman`s writings.

I have no problems with the statement you attribute to Terman and haven't
said anything contrary to that during the discussion.

Richard, I accept that you are committed to your view, lets leave it at
that. I don't think your statements on the matter support Walt's
proposition, rather since they are in my view flawed, I think they weaken
the body of evidence.

Owen