[mythtv-users] Electrical power in my cable line? Is that bad?
gull at gull.us
Fri Sep 7 16:27:45 UTC 2007
On Sep 7, 2007, at 8:10 AM, Brian Wood wrote:
> Precisely. Some B/W systems actually used the AC power line for a
> frame-rate standard.
Many surveillance camera systems *still* do. Some simple matrix and
sequencing systems, used to record multiple cameras on the same tape,
require all cameras to be in sync. Since the cameras run off 24 VAC,
it's easier and cheaper to simply make sure the power supplies are
all phased the same than it is to run the extra coax that would be
needed to genlock everything together.
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