Re: IO-LA SC/H Phase

Tom -
you need a good beating. I want you to stop measuring SC/H phase right now. SC/H phase was critical in matching color frame linear editing systems. Color frame errors, caused by SC/H error, caused the "infamous" (not to this crowd) H-Shift (a horizontal shift) at the edit point. This occured because you were telling your linear editing system to perform a cut or "match frame" at a particular edit, but this was not in the proper 4 field sequence (so that the subcarrier would line up properly, resulting in a phase change in the color by 180 degrees), so they would SHIFT the actual video by a frame, so the SC would line up (becuase it was better to get a H shift, than to have a blue face).

WE DONT DO LINEAR EDITING ANYMORE TOM. And on top of this, your piece of crap UVW-1800 Beta VTR doesn't even have a 2 field/4 field switch, so you can't even tell your VTR to force record the color frame pulse (if you kept a BVW-75 in 2F, it would not record the color frame pulse, and you would have a 50% chance of getting the H-Shift, even if you had proper SC/H in your system.

No broadcast facility is checking SC/H phase anymore. You have a Tektronix 1750 which had SC/H measurement (in the style of a vectorscope phase indication), and this is a COMPOSITE VIDEO SCOPE TOM. You are worried about SC/H phase, and you have the NERVE to be monitoring only ANALOG COMPOSITE VIDEO ON YOUR SCOPE - AND YOU ARE WORRIED ABOUT ACCURACY !!!!

So Tom - STOP IT, STOP IT RIGHT NOW, or I'm gonna come over there, and you don't want that now, do you ?

Bob Zelin