[Boatanchors] Feb 1964 CQ?
infomet at embarqmail.com
Sun Feb 20 16:36:14 EST 2011
Yep, get with Jim Hanlon. He has doc about it from about 1920.
----- Original Message -----
From: "LM Picard" <lmpicard at allstream.net>
Cc: "'BoatAnchors'" <boatanchors at puck.nether.net>
Sent: Sunday, February 20, 2011 4:09 PM
Subject: Re: [Boatanchors] Feb 1964 CQ?
>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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>> Boatanchors at puck.nether.net
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