Richard Harrison wrote:
Owen Duffy wrote:
"Richard, I accept that you are committed to your view. Let`s leave it
at that."

Owen is "throwing in the towel' but not admitting error.

I have no allegiance to a particular view. I am happy to view things
from another`s perspective. Owen mught do the same.

Owen Duffy also wrote:
"I understand your position to be that the behavior of a tank circuit is
independent of the transfer linearity of the active device...but
asserting that things are linear because there are no harmonics is wrong
and saying so is no support for your argument."

Owen has it wrong. The final amplifier is linear because its output is
an exact replica of its input except for amplitude, or close enough so.

When the waveshape of the output signal from an amplifier varies in any
respect other than amplitude from the waveshape of the signal feeding
the amplifier, the amplifier is distorting the signal.

Sinewave a-c is considered the perfect waveform. It consists of a single
frequency. Any other waveform consists of more than one frequency, So
the presence or absence of harmonics in addition to the fundamental is a
clear indication of distortion. Anyone can confirm waveform using an
oscilloscope.

Best regards, Richard Harrison, KB5WZI



From _Filtering in the Time and Frequency Domains_ by Herman J.
Blinchikov and Anatol I. Zverev: "A system is linear if the input
c1f1(t)+ c2f2(t) produces and output c1g1(t)+ c2g2(t) for all
f1(t) and f2(t), when it is known that an input f1(t) produces an
output g1(t) and an input f2(t) produces and output g2(t). The c1 and
c2 are arbitrary constants but may be complex numbers. This property of
superposition is characteristic of linear systems." You're ignoring the
addition part of the concept of linearity, Richard. Moreover, the
functions f1(t) and f2(t) don't have to be sine waves; the concept
is more general than that. Finally, read Richard Clark's post.
A sine wave out doesn't prove a sine wave in.
73,
Tom Donaly KA6RUH