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
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 control of
the test pattern generator. Two test pattern
generators may reside in the same frame, one
local and one remote.
Whengen-lockingto 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/H pulse generator module then uses
these pulses to lock the PLL on the module and
reset the vertical and horizontalcounterswithin 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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