[Boatanchors] Short Wave Broadcasts

[Jim Haynes]

speaking of detection of DSB with or with carrier also brings up the work
of John Costas at G.E.

Synchronous Communications, Proc. I.R.E. December 1956 p. 1956.  Reprinted
in Proc. I.E.E.E. august 2002, p. 1461 and in I.R.E. Transactions on
Communications Systems, March 1957, p. 99

Also Synchronous Detection of AM Signals, Tele-Tech, July 1952, p. 55.

Also Poisson, Shannon and the Radio Amateur, Proceedings of the I.R.E.
December 1959, p. 2058.

Apparently G.E. was trying to sell the military on DSBSC when Collins
was selling them on SSB.  While DSBSC uses twice the bandwidth of
SSB the two sidebands can be added coherently so you get the same
power saving either way, and perhaps some jam resistance.

jhhaynes at earthlink dot net