Lockup determines how stable a VTR will be.
Other Tracks and Lockup (2)
Vertical Lock (Capstan Servo)
The next level is called vertical lock or capstan servo.This is the minimum degree of lockup for professional production. Capstan servo machines make use of the control track (remember it?) and incoming sync from the sync generator. If you recall, vertical sync pulses are laid down on the control track, and, since they come from the sync generator, they are laid down at very precise intervals. A capstan servo machine is also hooked up to the sync generator and has a special circuit to compare the number of incoming vertical sync pulses from the sync generator with the number of pulses being played back from the control track. Since both pulses ...
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