[opendtv] Re: CBS Color without a wheel



On 12/10/2011 11:54 PM, Olivier Houot wrote:

You have to wonder if it was optimal for a country that choosed the
highest frame rate of 60 Hz to also select the smallest channel size of
6 Mhz. According to your documents, there would have been opportunities
to change that when the UHF band was opened, as CBS got 12 Mhz.

The 6 MHZ channel bandwidth was set in place as part of the first national television standard in late 1936 by the Radio Manufacturer's Association. Before this time there was no national television standard. Several manufacturers began broadcasting experimentally with their own standards from 1933 to 1937. In 1936 the FCC began informal hearings on the radio spectrum above 30 MHz.

How, after all this time we still have a 6MHZ TV broadcast bandwidth is
a complicated and extremely long story. It begins here:
http://www.tech-notes.tv/History&Trivia/Channel%20One/Channel_1.htm

Cliff


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