NewTek 3Play 820 - Manual (Page 96)

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the best approach, and ensures a match between 3Play™ system output and any downstream
video devices required to handle both it and any other (genlocked) sources.
VERTICAL POSITION, HORIZONTAL POSITION AND PHASE
Figure 73
Locking all devices to house sync is important, but this alone does not actually ensure a perfect
downstream match. Consider an army marching along: each step the soldiers take occurs at
precisely the same moment, so we could say their timing is synchronized.
Even so, problems result if one soldier leads with the left foot while everyone else is on the right.
Or perhaps everyone is evenly spaced and perfectly aligned but for one misfit who ‘tailgates’ the
soldier ahead of him and keeps stepping on his heels.
This is essentially why the Genlock tab provides several settings. The Horizontal and Vertical
Position settings pin the image in the proper space in the frame, and in doing so could be likened
to making sure each marching soldier is in position relative to his fellows (as viewed from above).
The Phase setting ensures proper color alignment, corresponding to making sure everyone is on
the left or right foot at the same time.
Thus, the Vert Position, Horiz Position and Phase settings allow you to tweak synchronization to
arrive at an optimum match between devices. (Typically, these settings are fine-tuned with the
aid of downstream vectorscope and waveform monitors.)