28 Feb
2012
28 Feb
'12
11:21 a.m.
Perhaps as amateur sync gen, there is reference to
mains sync here:-
http://vss.pl/cq_tv/cq-tv31.pdf
But I think that's for the sync generation at the camera. I did think the
Yes, and hat makes sense. Havign the vertical sync of a small
closed-circuit system or an amateur TV system locked ot the mains means
that if there's any maind hum/ripple in the video signal (and given the
verty small signal from the target of a vidicon tube, it's likely there
will be), havinf the signal mlocked ot the mains means you have a static
'hum bar rather than one that drifts up and down the picture. The former
is a lot less annoying.
But that's not the samething as suggestign a TV receiver would sync to
the mains rather than some sync pulse in the incoming signal
-tony