Extron Electronics MVP 104GX User Guide - Manual (Page 15)

MVP 104GX Installation 2-7
Genlock connections
A genlock (black burst generator) device can be connected to the MVP 104GX via
the BNC connectors shown below. The genlock feature allows the MVP 104GX to
be synchronized with other system components for seamless vertical interval
switching between sources. See Setting Up Genlock and Vertical Interval Switching in
this chapter.
Figure 2-5 —Genlock connections
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Genlock input connector — Connect an external black burst signal to this
BNC connection for genlocking the video signal in broadcast or other sync-
critical applications.
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Genlock output connector — Connect any downstream equipment that
requires genlocking to this BNC connector to route the black burst signal
throughout the system in broadcast or other sync-critical applications.
Setting Up Genlock and Vertical Interval Switching
For vertical interval switching (to allow clean switching between signals from
several devices during the vertical blanking period of each signal), a composite
sync signal can be applied at the Genlock In connector, and also passed to another
device via the Genlock Out connector.
If the genlock connectors are used only for vertical interval switching, no horizontal
or subcarrier phase adjustments are required.
Genlock setup
Genlock differs from simple vertical interval switching in that an external device (a
black burst generator) generates a reference sync signal for the system, and every
device that uses that signal has its output signal’s horizontal and subcarrier phases
adjusted to exactly match that of the generator to allow precise timing and full
synchronization. Genlocked systems produce cleaner switches between inputs
than do those without this type of synchronization.
An oscilloscope is required for genlock setup, and a vectorscope is recommended.
Waveform monitors of types other than a vectorscope may give the appearance that
timing is adjusted correctly when it is 180 degrees out of phase, which will result in
incorrect colors or picture artifacts.
All equipment in the system must be powered up and turned on for at least 15
to 20 minutes before genlock setup adjustments can be made and before the
equipment is used in a genlocked application.
REMOTE
RS-232/RS-422 OUTPUT
R 1 L R
GENLOCK
IN OUT
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