General Instrument C6M-II, Руководство по установке

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Installation 3-9
C6M-II Installation Manual
Video Scrambling
The C6M-II can be connected to a General Instrument Modulating Video Processor (MVP II)
for video and audio scrambling as displayed in Figure 3-6.
Note: General Instrument recommends using the C6U dual upconverter to interface with the
MVP II.
Figure 3-6
MVP II / C6M-II IF interfacing
When connecting the MVP II to the C6M-II, use the IF set up in the MVP II Installation
Manual and the following steps for connecting the C6M-II:
Verify that the MVP II is in standby mode.
Select video A input (INPT VA) on the Main menu and activate IF AGC on the Option
menu display
Tune to a test channel. Ensure that appropriate test equipment is connected to
RF OUT
on
the rear panel.
Measure the RF output and check for the following conditions:
If the RF video carrier output is less than 60 dBmV, adjust the RF output on the C6M-II for
60 dBmV.
Deactivate the IF AGC on the Option menu display and select auxiliary IF (INPT AUX) on
the Main menu as the input. When sync suppression scrambling is used, IF AGC
must be
turned off in the C6M-II
Monitor the test equipment to verify 60 dBmV is still present at the RF output.