Link electronic Stereo Amplifier PRC 970 User Manual

900 SERIES  
LINK ELECTRONICS, INC.  
VIDEO PROCESSING AMPLIFIER  
MODEL PRC-970  
MADE IN THE USA  
A new approach to video AGC is incorporated into  
the video and chroma level circuitry called “Dual  
FEATURES  
AGC  
Slope Release”. The DSR constantly monitors  
sync tip, peak whites and chroma level and can  
keep each parameter within NTSC specified limits.  
Front panel LED’s indicate when any of the AGC  
circuits are in operation, alerting the engineer to  
the fact that the incoming video needs to be  
corrected. A front panel switch can defeat any or  
all AGC’s if so desired. Front panel LED’s show  
the presence of Input Video, Auxiliary, and  
Reference.  
H Timing  
VIT By-Pass, Delete, F1&F2  
Remote By-Pass  
Hard By-Pass  
Full Proc Controls  
Auxiliary Input  
No Input, Black Output  
True Dynamic Compression  
Sync Gain, Front Panel  
Burst Gain, Front Panel  
Black Clip, Front Panel  
Anotherfeaturethatisimportantfortransmittersite  
operation is the video detect/auxiliary select  
function, If the primary video feed is lost, the PRC-  
970 automatically checks for an auxiliary input. If  
no AUX signal is present, the PRC-970 will output  
a black burst signal of its own, generated within. A  
relay provides a Hard-By-Pass in case of AC  
power failure. In addition, By-Pass mode can be  
selected from the front panel or by remote control.  
A switch on the rear panel selects between  
differential input and non-differential. An external  
reference input is provided for the production  
studio who wishes to process the output of the  
switcher.  
The PRC-970 was designed for the studio and TV  
transmitter applications. The front panel provides  
primary controls for Video Gain, Chroma Gain,  
Pedestal Level, and White Clip. For each of these  
controls, an LED shows the CAL position which  
overrides the internal presets. Other controls on  
the front panel include Video By-Pass, Field One  
and Field Two Pass/Delete, AGC On/Off, Black  
Clip, Sync Gain, Burst Gain, Subcarrier Coarse  
Phase, Subcarrier Fine Phase, and Horizontal  
Phase, A connector on the rear panel provides  
remote control of Video Gain, Chroma Gain,  
Pedestal Level, White Clip, Burst Gain, Sync Gain,  
and Black Clip.  
All of these features are packed into a one rack  
unit case. The unit is engineered to exacting  
standards of performance and reliability.  
The remote control is model PSR-970. The remote  
can be located up to 250 feet away from the main  
unit.  
LINK  
ELECTRONICS, INC. 2137 Rust Avenue Cape Girardeau, MO 63703-7668  
Phone 573 334 4433 FAX 573 334 9255  
 

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