piclist 2001\01\29\080032a >
Thread: Having trouble with LM1881 / NTSC sync separator
picon face BY : Bob Ammerman email (remove spam text)

>The CRO signal may be missleading, you need to check if the is set to
ALTernate or CHOP. You need >CHOP to check that the video is in phase, ALT
will always show the two signals in sync as it triggers for >each chanel.
Some CRO's chose between these modes depending on the trace sweep speed.

Only if the scope is set to 'NORM' trigger. My scope lets me trigger on a
single channel and then display both channels on that timebase (using either

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level

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<004f01c089f2$28286200$1ae9c540@sciencekit.com> 7bit

See also: www.piclist.com/techref/displays.htm?key=ntsc
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Subject (change) Having trouble with LM1881 / NTSC sync separator

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