unbalanced. Latched lamp drive and latch reset require one
wire connection to the control panel. CMOS outputs at
!7.5 V from the detectors are available as well as an open
collector output which is enabled when any detector senses
tone. Power requirements !15 V; 25 V unreg.
222 mm x 100 mm with 96 way DIN4l6l2 connector. SCPD
As GEl/57l, but only half of board equipped with
components. For use in EPll/502. DD 1975.
Overlay Effects Generator similar in function to GEl/57lA
with additional circuits to enable the use of external
"excess" key signals and fringe suppressed foreground
signals. DD 1976.
Caption Keying Waveform Generator. As GEl/585 but with
additional circuitry to increase line blanking. Avoids
visible background signal breakthrough in "Whole screen
mode" for use in OB vision mixing equipment (EPll/502)
only. 406mm x 203mm. PCB. Used as a pair with GEl/569
(Caption Keying Waveform Generator). ED 1978.
Test Signal Trigger Generator. Provides all trigger and
drive signals for GE6/540, options 1, 2, 3 and 4 to produce
the following full field waveforms:
Luminance and Chrominance 2T Pulse and Bar;
5-step Staircase (all lines and CCIR variations);
50Hz Square Wave;
8 Line Square Wave;
Single Phase Colour Bars;
Line Duration White Bar;
Luminance 2T Pulse;
UK National ITS "B";
20 second Square Wave;
UK National ITS "A";
The facility also exists to disconnect the generated output
repetetive syncs, or mixed syncs with or without trigger
pulses being provided for ITS waveforms. The internal
s.p.g. can be locked to external syncs and subcarrier.
Colour burst phase can be either fixed or swinging.
Waveforms can be selected by front panel push buttons or
Option 2: UN3/570 and UN23/639 fitted. Enables waveforms
to be selected automatically by two operator programmed
Option 3: Option 1 and 2 together.
Power requirements +15V, -15V, +18V all unregulated
9.243(79). DDHB 9.243(79).
Test Signal Trigger Generator. All facilities and options
as GEl/59l but provides trigger and drive si gnals for
field waveforms for transmission circuit testi ng to Post
2T Luminance Pulse and Bar;
IT Luminance Pulse and Bar;
2Tc Chrominanc e only Pulse and Bar;