Re: FM "deviation"
On FM theory, for those who don’t mind older publications, there is a nice, gentle treatment, with graphs and diagrams, in the book “V.H.F. Radio Manual”, by P.R. Keller, Newnes, 1957. I imagine that it would be typically available second-hand on ABE. It includes diagrammatic representation of the triangular FM noise spectrum and the effects of pre- and de-emphasis.
Cheers,
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