Roy Lewallen wrote:
A quick web search shows that what I described is properly called
"dynamic carrier control". My mistake. I only recall having seen one
such amateur transmitter, and it was over 40 years ago. . .

I owned one, a Heath DX-60B. Got my General in 1974, DSB-carrier AM
phone was already essentially obsolete. When I got a 33 signal report
from a 40-meter station four miles away, I decided to stick to CWgrin...

Seems to me there was a circuit for homebrewing dynamic carrier control
in the ARRL Handbook for awhile.
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com