A PRODUCT OF THE GENFLEX SYSTEM
LINK ELECTRONICS, INC.
ANALOG PULSE GENERATOR
812-OP/H
MADE IN THE USA
OUTPUTS
Sync
Subcarrier
Blanking
For Future Generations
The 812 OP/H 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/H will reside in the SPG-812 chassis alongside various analog and digital modules-up to six modules per chassis.
When gen-locking to incoming video, the SPG-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/H pulse generator module then uses these pulses to lock the PLL on the module and reset the vertical and horizontal counters within the complex programmable logic devices. This times up all counters by an external reference.
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 control of the test pattern generator. Two test pattern generators may reside in the same frame, one local and one remote.
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
