Richard Clark wrote:
In other words, the non-linearity shown by the lack of
congruence to the Cosine curve is not a presumption of non-linearity
by the modeler; it is merely reporting an analysis.

You are being fooled by an illusion. Any deviation from
single frequency sinusoidal signals would generate harmonics
which we know doesn't happen. Your "non-linearity" is not
really there. For instance, a decrease in VF may compress
the waveform but that is not non-linearity.
--
73, Cecil http://www.qsl.net/w5dxp