Grass Valley 7600REF - Manual (Page 45)

7600 SD/HD/MHD-REF — Instruction Manual 45
Operation
Genlock – Mode
Select the Genlock mode required by using the Adjust knob or the Left and
Right arrow buttons. All available modes are discussed below.
Note Please be aware that the mode will change immediately when an option is
selected.
• Internal Free Run – sets the unit to be free running, relying on the internal
oven oscillator for stability. The ScH of the unit will be set to zero.
• External 10MHz – sets the unit to genlock to the 10MHz input. There will
be no fixed phase relationship with any other units lock to this signal.
The ScH of the unit will be set to zero.
• Manual SC Phasing – sets the unit to genlock to the video input. The sub-
carrier phase offset may be adjusted as required.
• Force Strict ScH – sets the unit to genlock to the video input. The ScH of
the outputs of the unit is forced to zero regardless of the genlock input
ScH. This is achieved by moving the line timing with respect to the
genlock input until the correct ScH phase results.
• Follow External SC Phase – sets the unit to genlock to the video input. The
subcarrier output phase is set to be the same as the input genlock video.
• Sync Lock Only – sets the unit to genlock to the video input. The system is
genlocked using only the sync information of the genlock video input.
the ScH phase of the output is forced to zero (correct).
Genlock Loss
Select the operational mode of the unit following loss of the genlock signal
from the following choices:
• Revert to Internal – if the external reference signal is removed, the unit will
use the internal oven maintained oscillator as its master oscillator.
• External 10 MHz – if the genlock video input is removed, the unit will use
the 10MHz input as its master oscillator. if the 10Mhz input is not
present when the video input fails, the unit will use the internal oven
maintained oscillator as its master oscillator.
• Flywheel – if the genlock video input is removed, the unit will continue
to operate - flywheel - at the same frequency as the genlock input just
removed.
Note Note that if the unit is powered up in this mode with no genlock input applied,
the 7600REF outputs may not be within specification.