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SCG-120 PAL/NTSC Genlock Broadcast Encoder

The SCG-120D Dual Standard Broadcast Encoder is switchable between PAL and NTSC coding and is designed for use in graphics and other applications where the signal must be correctly timed. The SCG-120D and its PAL (SCG-120P) and NTSC (SCG-120N) variants offer cost-effective solutions in single and multi-standard systems. A comprehensive selection of inputs and outputs give optimum flexibility. Based on Eurocard modules, the SCG-120 is normally supplied in a 19" 1U rackframe.
 

There are inputs for both RGB and YPrPb component video with three composite, two YC and one YPrPb component video outputs, plus blanking and syncs. The SCG-120 has a built-in colour bar generator for composite and component outputs. The input signals are blanked to allow the correct encoding of signals such as RGsB (syncs on green).

I and Q matrixing is used in NTSC encoding, and the correct Sc-H relationship is maintained both when the SCG-120 is free-running and when it is externally genlocked.

The internal SPG genlocks to composite PAL or NTSC reference signals and provides pulse outputs to drive associated equipment such as graphics workstations.

The key signal is internally delayed by an active delay module to compensate for the coder's processing, so a key signal which is co-timed with the RGB/YUV input is also co-timed with the composite output signal - this saves the cost of an external delay line for downstream keying.

Specifications
Inputs:

RGB non-composite

YPrPb non-composite

Reference

Return loss

Key in

3 BNC, 700mV, 75Ω looping

3 BNC, 700mV, 75Ω looping

PAL/NTSC black-burst (mixed syncs optional)

<-35dB to 5MHz

BNC, 700mV, 75Ω terminating
Outputs:

Composite (coded)

YPrPb component

Y-C S-VHS/Hi-8

Mixed syncs

Mixed blanking

Key out

Other pulses

3 outputs PAL or NTSC, 3x BNC 75Ω , 1V pk-pk

1 output, 3x BNC 75Ω , 1V pk-pk

1 output, 2x BNC 75Ω , 1V pk-pk

1 output, BNC 75Ω , 2V pk-pk

1 output, BNC 75Ω , 2V pk-pk

Delayed key signal co-timed with composite output

Optional

Performance:

H phase adjustment

Subcarrier phase adjustment

Non-linearity

LF tilt

Residual subcarrier

Sync rise time

Burst rise time

-3.5 to +5.0mS relative to reference input

>360o continuously variable

<1%

<1% at 50Hz

<0.5%

250nS nominal

300nS nominal

Models:

SCG-120P

SCG-120N

SCG-120D

Housing

Power

PAL version

NTSC version

Switchable PAL/NTSC

All models 1U 19" rackframe, 410mm deep

All models IEC inlet, 115 or 230V AC (15VA nominal)

Keyer Options:

SCG/Linear

Inputs

Outputs

Luminance/chrominance gain

K 2T pulse/bar

Differential gain

Differential phase

Timing input/output

Composite linear keyer with enhanced control panel

Foreground (caption) & background on 75W BNC

Preview and two transmission outputs on 75W BNC

<1% error

<1%

<1%

<1o

<1o either input by any route

FAQ's

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