Link electronics PRC-970 User manual

900 SERIES
MADE IN THE USA
LINK ELECTRONICS, INC.
VIDEO PROCESSING AMPLIFIER
MODEL PRC-970
FEATURES
AGC
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
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,
PedestalLevel,WhiteClip,BurstGain,SyncGain,
and Black Clip.
TheremotecontrolismodelPSR-970.Theremote
can be located up to 250 feet away from the main
unit.
A new approach to video AGC is incorporated into
the video and chroma level circuitry called “Dual
Slope Release”. The DSR constantly monitors
sync tip, peak whites and chroma level and can
keepeachparameterwithinNTSCspecifiedlimits.
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.
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.
All of these features are packed into a one rack
unit case. The unit is engineered to exacting
standards of performance and reliability.
LINKELECTRONICS, INC. 2137 Rust Avenue Cape Girardeau, MO 63703-7668
Phone [phone] FAX [phone]

MODEL PRC-970 PROCESSING AMPLIFIER
SPECIFICATIONS
INPUTS:
PRIMARY VIDEO IN:
Level: ............................................................1Vpp±6dB
Input Impedance: ................................................... 75Ω±1%
Configuration: ................................Differential,Single-Ended, Switchable
AUXILIARY VIDEO IN:
Level: .............................................................1Vpp±6dB
Input Impedance: .....................................................75Ω± 1%
Configuration: ....................................................... Differential
EXTERNAL REFERENCE VIDEO IN:
Level: .............................................................1Vpp±6dB
Input Impedance: ................................................ >15KΩLooping
Configuration: ....................................................... Differential
ReturnLoss: .................................................. >[email protected]
OUTPUT:
Processed Video:
NumberofOutputs:................................... Two(2)(Programand Monitor)
Output Impedance: .....................................................75Ω±1%
Level:............................................................. 1Vp-p±6dB
Signal-to-Noise: ..........................................................>60dB
Hum: ..................................................................>55dB
H.Blanking:............................................Adjustable,8.4µSMinimum
Frequency Response: ............................................ ..-1dB@7MHz
.............................................................. -2dB@8MHz
............................................................. -3dB@10MHz
DifferentialGain: ........................................................<0.2%
DifferentialPhase: ....................................................... <0.1°
Tilt: ...................................................................<0.5%
Common Mode Rejection (All Inputs): ....................................... >50dB
Propagation Delay: .......................................................175nS
Chroma to Luminance Delay: ...............................................<20nS
FRONT PANEL CONTROLS:
Video Level (Contrast): ...................................................>±6dB
BlackLevel(Brightness): ............................................±15IREUnits
ChromaLevel:.................................................... +6dBto-35dB
White Clip: ................................................... 50to150 IRE Units
HorizontalPhase: ....................................................... ±2.5µS
BurstPhase: ............................................................. 360°
Black Clip: ....................................................-40IREto+10IRE
Sync Amplitude: ................................................ -70IREto-5IRE
Burst Amplitude: ................................................60IREto<5IRE
POWER REQUIREMENTS:
Input Voltage: ................................................ 120/240 VAC ±10%
Power: ..............................................................15Watts
MECHANICAL:
Height:............................................................ 1.75Inches
Width: .............................................................. 19Inches
Depth: ............................................................ 8.85Inches
Weight: ............................................................. 5.25Lbs.
LINKELECTRONICS, INC. 2137 Rust Avenue Cape Girardeau, MO 63703-7668
Phone [phone] FAX [phone]