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Re: Canarsie CBTC

Posted by Stephen Bauman on Wed Jun 15 07:11:42 2005, in response to Re: Canarsie CBTC, posted by tracksionmotor on Tue Jun 14 23:43:43 2005.

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AT&T pioneered AM circuits for international telephone and SSB for cable, not having a clue that SSB was so very able for HF radio. SSB was experimented with vigor after WW2 and it wasn't until the USAF teamed up with Collins Radio in the fifties that it took off.

SSB was invented by Bell Labs' John Carsons. It is quite likely that AT&T had a patent on it. HF radio manufacturers would have had to pay Bell a royalty. Possibly, they preferred to wait out the patent.

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