[Boatanchors] double-sideband suppressed-carrier

[WA5CAB--- via Boatanchors]

I don't know whether USN or USAF bought the R-1051 et al first.  But the 
Navy certainly bought a lot of them from the mid-60's on.  The R-1051 and the 
various transmitters and receiver-transmitters in the family are all ISB.  
However, no attempt that I know of is made to lock onto the suppressed 
carrier.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 10/19/2014 17:38:28 PM Central Daylight Time, 
rbethman at comcast.net writes: 
> Gentlemen,
> 
> This concept *WAS* adopted.
> 
> However, with a *twist*!
> 
> It has been deployed by the USAF as *Independent Sideband Suppressed 
> Carrier*.
> 
> Each sideband carries a different signal, and can be used for data on 
> one sideband, while voice is used on the other.
> 
> The USAF has been doing it for some decades, and continues even today.
> 
> Regards,
> Bob - N0DGN
> 
> 
> 
> On 10/19/2014 5:25 PM, Jim Haynes wrote:
> >
> >John Costas of G.E. was a proponent of double-sideband suppressed-carrier
> >AM.  His paper on the topic, along with pictures of the equipment, was
> >in Proceedings of the IRE.  "Synchronous Communications" in ProcIRE
> >December 1956, reprinted in Proceedings of the IEEE in August 2002.
> >Also a paper in IRE Transactions on Communications Systems with the
> >same title in March, 1957.  And a lighter weight article "Synchronous
> >Detection of AM Signals" in Tele-Tech, July 1952.
> >
> >I assume G.E. was trying to sell the Air Force on DSBSC while Collins
> >was selling SSB.  Costas' argument is basically that while DSB takes
> >twice the bandwidth of SSB the two sidebands add coherently so you can
> >use half the transmitter power.  And as a bonus you can receover the
> >exact carrier frequency, whereas with SSB you are dependent on the
> >accuracy of oscillators to get the carrier frequency close enough for
> >good intelligibility.  It seems that SSB won the battle; perhaps it
> >really was superior operationally, or perhaps the friendship of
> >Art Collins and Curtis LeMay had something to do with it.
> >
> >In my limited knowledge prototype equipment like that was surplused
> >as soon as the experiment was over.
> >
> >Jim W6JVE