Grass Valley LDK 5417 - Manual (Page 48)

LDK 5417 + LDK 4417 User’s Guide | Base Station installation 36
The range of variation of the digital output signal with respect to the reference signal is
approximately -12.8 µs + 5.4 µs.
.
If the composite video output is used as a monitoring output, it is recommended to set
the upper switch of S1151 to «OFF» to disable the Subcarrier genlock. In this case, the
output composite signal carrier is internally slaved with respect to the sync signals.
If necessary, the «SC phase« and «Front porch» alignment can be adjusted using the
«SC/H» and «FRONT PORCH» thumbwheels.
Equipment without external reference (free mode)
Set the upper switch of S1151 to «OFF». The «
ΦH COARSE» and «ΦH FINE»
thumbwheels are inactive.
If the composite video output is used as a monitoring output, and if necessary, the «SC
phase« and «Front porch» alignment can be adjusted using the «SC/H» and «FRONT
PORCH» thumbwheels. The output composite signal carrier is internally slaved with
respect to the sync signals.
Phase alignment with a analog installation
External reference on «GENLOCK» input with blackburst
The reference signal should be a black video signal with burst delivered by a Broadcast
generator (stable SC/H) and terminated with 75 Ohm load.
Set the upper switch of S1151 to «ON». In this case, the output composite signal
subcarrier is slaved to the reference burst.
The horizontal phase of the composite signal with respect to the external reference signal
is adjusted using the «
ΦH COARSE» and «ΦH FINE» thumbwheels. The range of
variation depends on the position of the lower switch of S1151.
S1151 up position (FINE):
• «
ΦH COARSE»: Adjustment in steps of 592 ns.
• «
ΦH FINE»: Adjustment in steps of 37 ns.
The range of variation of the composite signal with respect to the reference signal is
approximately -6.4 µs + 2.7 µs.
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8
5
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8
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8
5
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Reference signal
Digital signal
S1151 : FINE = -6.4µs to +2.7µs
S1151 : WIDE = -12.8µs to +5.4µs
REF