[Boatanchors] Feb 1964 CQ?

[LM Picard]

I thought that AT&T used SSB with pilot carrier for telephony on their 
long lines before it was ever popular for RF comms.

Chuck McGregor wrote:
> The big advantage to DSB is that you can use a Costas Loop detector to 
> regeneraate the carrier for  automatic synchronization - no BFO drift, 
> no duck talk.  This was a big advantage with the drifty radios that 
> were common before the 1950's.   SSB wasn't very satisfactory until 
> Art Collins proved that a sufficiently stable receiver could be built.
>
> --Chuck N7RHU
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