Link electronic Switch 812 OP D User Manual

A PRODUCT OF THE GENFLEX SYSTEM  
LINK ELECTRONICS, INC.  
DIGITAL SDI GEN-LOCK  
812-OP/D  
MADE IN THE USA  
For Future Generations  
The 812-OP/D accepts digital blackburst to gen-  
lock to an external source. The genlock cell is slot  
number two. All other modules lock to the 812-  
OP/D. Whether module 812-OP/C or 812-OP/D, all  
other modules lock to whatever in cell number two.  
The number two module will produce the necessary  
lock pulses for all of the other modules in the  
chassis. The remaining four cell will accept a digital  
or analog test of black module.  
The 812 OP/D digital genlock module also has a  
video presence detector that controls if the module  
is in genlock or free-run. A bicolor LED is used for  
a video presence indicator, whenever video is  
present the LED turns green and whenever there is  
no video present the LED turns red. If there is no  
video to the module, it then automatically switches  
over to a free-run frequency condition and a front  
panel control is used to adjust the dc volte of the  
VCXO. This then changes the frequency of the 27  
MHZ oscillator.  
The 812-OP/D digital genlock module takes in a  
stable digital black burst signal and genlocks to it.  
This is accomplished by stripping horizontal sync  
off of the in coming black burst signal and doing a  
phase and frequency lock to a very stable 27 MHz  
VCXO. The phase-lock-loop has a LED indicator  
that signals green when horizontal lock is obtained  
and signals red when no lock is obtained. The 27  
MHZ signal, clocks a complex programmable logic  
device that generates all the necessary pulses that  
are needed for the rest of the modules. The pulses  
are buffered and sent down the mother board buss.  
Referencesourceselectioncanbeaccomplishedin  
three ways:  
1. No video, the module would automatically switch  
over to its internal reference source.  
2. Manually switching the front pane! switch  
AUTO/INT over to its internal reference source.  
3. Applying video and having the AUTO/INT switch  
paced in the AUTO mode. The module is then  
running in proper genlock mode.  
Thiscomplexprogrammablelogicdevicealsotakes  
in stripped vertical sync and field identification  
pulses and resets appropriate counters within the  
device. This develops output pulses that are in  
proper time and phase with incoming video.  
Whenever, the 812 OP/D genlock module is placed  
in its INT, internal reference source a front panel  
yellow LED indicator lights up and the module is  
free-runningonitsinternal oscillator. Whenever, the  
812 OP/C genlock module.  
The PCO-818 automatic pulse change-over modules operate as independent or synchronized operation. Two  
PCO-818 change-over chassis may be interlinked to cause all modules to switch should a failure occur in the  
master generator.  
LINK  
ELECTRONICS, INC. 2137 Rust Avenue Cape Girardeau, MO 63703-7668  
Phone 573 334 4433 FAX 573 334 9255  
 

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