29 May
2010
29 May
'10
1:43 a.m.
Date: Fri, 28 May 2010 18:20:35 -0700
From: eric at brouhaha.com
To:
Subject: Re: Video standards (was RE: Pravetz 82)
Randy Dawson wrote:
Right on Eric.
With sound at 4.5, you are suggesting they move it up a bit, and make the channel wider?
The days of spectrum space, 6 MHz wide for 1 TV broadcast are all now all gone.
I'll poke one more TV lore statement, then return the bandwidth to vintage computers.
Chanel 2, 54Mhz the lowest of the channels, Houston TX was reported with reception in the
UK
Salt dome ground plane in the Houston area was cited as a reason, but this channel was
well known for DX TV reception.
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Quite a bit of thought went into NTSC, to keep it
compatible and add color. The burst 3.758 MHz is chosen to not fit a harmonic of the line
rate, frame rate, and that was adjusted too, from 60Hz to 59.xxx, xxx, =975 if I recall
but its been a while.
Approximately 59.94 Hz. From monochrome to color, all the video timings
were adjusted by a factor of 1000/1001, to minimize interference between
the chroma and the sound carrier. It seems like it would have been
better to keep the video timing and move the sound carrier up by
1001/1000, but purportedly the FCC didn't like that idea, even though
receivers of the day wouldn't have noticed.
Eric