"Antonio Vernucci" wrote in message
...
You are both right.

On a 1966 issue of QST magazine, I found the advertisement of
"Echoplex" by Kahn Research Laboratories. It sold for more than 300$,
which was not cheap at those times.

As to Lincomplex, I remember a friend of mine working for Page Europe
who told me having installed Lincomplex on HF transmitters in Africa.

73

Tony I0JX
Rome Italy

Thank you, Tony.

Somehow, I think you are talking about Leonard R. Kahn of Kahn Research
Laboratories in Freeport, Long Island, NY, and not A. Q. Khan of Khan
Research Laboratories in Kahuta, Pakistan (Pakistan's main nuclear
weapons laboratory as well as an emerging center for long-range missile
development). Leonard Kahn is best known for his paper: L.R. Kahn,
“Single Sideband Transmission by Envelope Elimination and Restoration,”
Proceedings of the IRE, Vol. 40, July 1952, pp. 803–806., and for his
work on AM stereo. Google somehow doesn't know the difference...

73, Barry WA4VZQ