Installation, cont’d
To synchronize the MVP 104GX’s video output with a genlock signal, follow these steps:
1. Power up and turn on all the devices that will use the genlock signal. The devices must be on for at least 15 to 20 minutes before proceeding with any adjustments.
2. Connect the active timing source signal to the Genlock In connector on the rear panel.
Timing Source
OUT
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| 75 ohm Terminator |
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| To Scope Probe |
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| GENLOCK |
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| IN | OUT |
UT 2 | INPUT 3 | INPUT 4 | OUTPUT |
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| L 1 R L 2 R L 3 R L 4 R | L 1 R |
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| OUT | OUT | B | C |
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| REMOTE |
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3. Connect the video input signals to the MVP 104GX, as described previously in this chapter.
4. Connect the oscilloscope (“scope”) probe A to the Genlock Out connector. This will provide the scope’s reference signal. In order to avoid altering the genlock signal, use the cabling configuration that will be used in the installation. Either connect the genlock signal cable from the scope to the next device in the system to be timed, or provide 75 ohm termination at the scope’s genlock output.
5. Connect scope probe B to the MVP 104GX’s composite video output connector.
6. Using the instructions for the scope you are using, set the scope to view the signals’ horizontal phases. Adjust the horizontal phase until there is no (0°) difference between the composite video output’s horizontal sync phase and the genlock signal’s horizontal phase. See Oscilloscope displays.
7. Set the scope to view the subcarrier signals. Adjust the sub phase by rotating the encoder knob until there is a zero phase difference between the genlock signal and the NTSC/PAL output.
8. View the horizontal phases again. If the phase difference is not zero, repeat steps 6 and 7 until the settings do not change.
9. Once the settings are stable, disconnect the oscilloscope, and reconnect the genlock cables.
10. Check the display(s) for proper colors and for undesirable artifacts in the image(s). Make adjustments as necessary.
11. If other MVP 104GXs are part of this genlock daisy chain, connect the oscilloscope to each device, and repeat this procedure.