The differences between PAL & NTSC go way beyond modulating RF. Even at
baseband, the monitors will be different & one may not work with the other's
signal. The Frame rate, or vertical interval is different - NTSC based on
North American AC at 60 Hz, as opposed to European 50 Hz, and the Horizontal
sync is different, as a result of being harmonically related to the vertical
sync. There is an issue (probably not with the signals in question) with the
color sub-carrier frequency offset from the video carrier, and the fact that
(because of the aforementioned) the video (baseband) bandwidth for PAL is
much wider than NTSC. A monitor may work with the other format if it is a
little forgiving (has some slop built into the sync'ing circuits). Give it a
shot with whatever is on hand, then go shopping if need be.
IMHO
_\\|//_
(' O-O ')
ooO-(_)-Ooo
Mark Carter
AM Communications, Inc.
car...@amcomm.com <mailto:car...@amcomm.com>
Voice: 215-538-8710
Fax: 215-538-8779
-----Original Message-----
From: Tony J. O'Hara [mailto:tonyoh...@compuserve.com]
Sent: Tuesday, July 25, 2000 12:24 PM
To: Bailey, Jeff
Cc: 'emc-pstc'; 'brian.mcauli...@tellabs.com'
Subject: RE: 8591EM monitor output
A modulator for PAL is different than NTSC! PAL receivers use different
frequencies and I also think there are other differences!) . However, I
would assume that if you're in a locality that has PAL receivers then you
should be able to easily get a PAL modulator.
Remember also, that most "new" (last 5 years or so) receivers (at least US
NTSC ones) have a base-band video input (making them also a monitor!), then
you wouldn't need a RF modulator!
Tony
Colorado
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