Amplitude Modulation of NTSC requires a LOT of signal to be noise free since
even a small amount of noise is visible.

We have no basis for comparison with ATSC other than by level, since we
don't have a way to discern between multipath, power line noise, deliberate
or any other kind of interference. How are we supposed to point the
antenna? With a stupid meter that takes 10 seconds to average? All I can
think of is to put it on a rotor and nudge it 2 degrees every 10 seconds
until the picture pops in. It is amazing what gets left out in the rush to
market.

"Cecil Moore" wrote in message
...
Sal M. Onella wrote:
By the old TASO standards, you need over 40 dB s/n to get a nice
picture,
which requires a lot more peak RF power. By comparison, the digital
signal
needs only about 17 dB s/n.

What happens at a 12 dB s/n for both? That's probably
what happened here during Hurricane Ike.
--
73, Cecil http://www.w5dxp.com