[Boatanchors] Short Wave Broadcasts

[rbethman]

SAC - USAF used the pilot carrier and each sideband carried different data.

One carried voice, the other was either RTTY or some other form other 
than voice.

They still continue this today.

I pick them up in the 12MC range.

Bob - N0DGN




On 4/19/2014 12:07 PM, Jim Haynes wrote:
> 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
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