Link electronic Switch 812 OP L User Manual

A PRODUCT OF THE GENFLEX SYSTEM  
LINK ELECTRONICS, INC.  
ANALOG PULSE GENERATOR  
812-OP/L  
MADE IN THE USA  
OUTPUTS  
Sync  
Subcarrier  
Burst Flag  
For Future Generations  
The 812 OP/L is designed to provide composite  
sync, composite blanking, and color subcarrier for  
system applications which require 4Vpp drive  
pulses and 2Vpp subcarrier. Each of the output  
pulses is rise-time controlled to EIA standards and  
will drive a 75 Ohm load at its specified voltage.  
The subcarrier output is filtered for low harmonic  
distortion and is driven by a discrete amplifier. The  
812 OP/L will reside in the SPG-812 chassis  
alongsidevariousanaloganddigital modules-upto  
six modules per chassis.  
When the 812 OP/A analog black burst module is  
running in its free-run mode a front panel control  
adjusts the frequency of the Voltage Controlled  
Crystal Oscillator (VCXO). This device features a  
stability of 2.5ppm over the operating temperature  
range of 0° to 70° C.  
The rear panel view of the SPG-812 is shown on  
the back page, showing two 812 OP/H installed in  
the cell # 5 and # 6 (as viewed from the rear). An  
812 OP/K is installed in cell # 3. Cell #1 is  
dedicated for tone, analog and AES. Cell # 2 is  
dedicated for gen-lock or the master time base,  
812 OP/A, B, C or D. A mixture of analog or digital  
in the same frame depends on the specific  
module chosen. The rear panel accommodates a  
connector for remote controll of the test pattern  
generator. Two test pattern generators may reside  
in the same frame, one local and one remote.  
Whengen-locking to incoming video, theSPG-812  
chassis will have either an analog 812 OP/C, gen-  
lock to analog black or a 812 OP/D digital genlock  
module in slot #2. This module places the timing  
pulses down the motherboard buss as reference.  
The 812 OP/L pulse generator modue then uses  
these pulses to lock the PLL on the module and  
reset the vertical andhorizontalcounters within the  
complex programmable logic devices. This times  
up all counters by an external reference.  
Power supply voltage fault indication is  
accomplished by a circuit that monitors all three  
supply voltages and turns off the green LED if one  
or any is lower then a nominal value.  
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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