GRASS VALLEY KARRERA, Installation & Service Manual

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Installation & Service Manual
261
Correcting an Out-of-Time Stream
CAUTION: Adjusting the Switcher Horizontal and Vertical Offsets
moves the switcher’s system timing which will affect all
switcher sources.
1 Review the timing as displayed in the Timing Analyzer and compare it to the range
in the Timing Window.
2 When the source is outside the timing window:
a Change the source timing, or,
b Adjust the switcher timing in the Timing menu by selecting the Analyzer Source
(far right) and changing the Switcher Horizontal and Switcher Vertical data pads
until the source is within the timing window.
3 Once all the sources are timed correctly, power cycle the switcher and verify that all
sources are still within the correct timing window.
Other Settings
Matte Limiting
Matte Limiting determines how the matte generators produce colors. Limits can be
imposed to prevent downstream signal problems.
None – In this mode, no limiting is imposed. Analog signal paths and monitors may behave
poorly to some colors produced in this mode.
Decodable – This limiter mode produces colors that decode to valid RGB components. Not
all valid RGB colors can be transmitted in NTSC, however. Saturated colors near yellow and
cyan over modulate an NTSC transmitter.
Transmittable – This limiter mode prevents over modulating an NTSC transmitter, but can
produce colors which can not be decoded into RGB. For example, a 0% luminance blue
produces negative green and red components.
Both – This limiter mode is similar to Decodable , except that maximum levels are reduced
slightly around yellow and cyan to prevent over modulating an NTSC transmitter.