Installation, cont’d
If the genlock connectors are used only for vertical interval switching, no horizontal or subcarrier phase adjustments are required, and the Burst Lock LED on the front panel does not light (see Genlock controls and indicators in chapter 3).
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.
To synchronize the SVS 100’s video output with a genlock signal, follow these steps:
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.
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
75 ohm Terminator
OUT
To Scope Probe B
To Scope Probe A
|
|
| GENLOCK |
|
A |
|
| IN | OUT |
INPUTS | OUTPUT |
| ||
|
| |||
| L 1 R L 2 R L 3 R L 4 R | L 1 R |
|
|
B | C |
|
|
|
OUTPUT |
|
| REMOTE |
|
|
|
|
|
3. Connect the video input signals to the SVS 100, as described previously in this chapter. The Burst Lock LED lights green to indicate that the SVS 100 is receiving an acceptable genlock (black burst) sync signal via the Genlock In connector.
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 SVS 100’s composite video output connector.
6. Using the instructions for the scope you are using, set the scope to view the signal’s horizontal phases. Press the SVS 100’s Horz Phase button for 2 seconds (see the Operation chapter) and adjust the horizontal phase by