modulator circuit board. Power requirements +5 V, !12 V.
4U unsupported p.c.b. with PN1/29J front panel. Parent
equipment MD4SM/6. Chassis extender CH4/5. RD 1987.
GE020627 GE2/627A
Clock Pulse Generator.
Modified version of GE2/627 onto a
CH1/64J, with a GE7/507 to form a subcarrier locked clock
generator. This unit forms part of the 68 Mbits sub-
Nyquist PAL system. CH1/64J. DD 1982. DDHB 1.174(83).
GE020635 GE2/635
Pulse Generator.
Used in Tarif Two (EP6L/509) to provide
pulses for control and clamping. CH1/64J. DD 1977. DDMI
7.398(77).
GE020636 GE2/636
Pulse Generator.
Small PCB mounted at rear of main frame
in RC5M/501 Rebroadcast receiver. Generates line frequency
pulses to drive gated a.g.c. unit. DD 1977. DDMI 5.349.
GE020638 GE2/638
Variable
Blanking
Generator
for
use
with
inlay
camera
channel, colour synthesiser etc. Front panel controls
permit full adjustment of the start and finish of the line
and field blanking periods. Power requirements 240V mains.
CH1/64A. OU 1980.
GE020639 GE2/639
PAL Square Wave Generator.
Genertes PAL Square Wave from
mixed syncs and burst gate pulses. Input and output pulses
are CMOS logic levels, polarities are set by internal
kinks.
Originally
designed
as
a modificati
on
to
the
GE6/541. Power requirements +5V tp +12V. 7lmm x l44mm, to
fit in CH1/64 chassis. DD 1980.
GE020640 GE2/640
Negative 2T Pulse Generator.
An option unit for use with
the GE6/540 in the GE4M/561 TV Test Signal Generator.
Contains the logic and pulse generator for producing a
negative 2T pulse on every line of the white bar of the
luminance/ chrominance pulse and bar waveform. Does not
contain the pulse shaping filter, this is in the GE6/540.
Power requirements +5V, -12V. 47mm x 173mm card. Parent
equipment
GE6/540.
DD
1980.
DDMI
9.268(82).
DDHB
9.170(82).
GE020641 GE2/641
Sync
Monitor
Sequencer.
Generates
sequential
scanning
pulses and data enable, clear etc., pulses. Power
requirements +6, -6V. 4U free standing. Parent equipment
EP5L/516. DD 1981.
GE020642 GE2/642
Pulse Generator.
The
unit
generates
11.456MHz
clock,
a
frame-marker pulse and a 6-bit parallel data signal
containing two frame-alignment words in the appropriate
time-slots. The unit may generate these from its internal
clock source, or for re-multiplex applications, it may
receive them from an external source. The unit forms part
of 68 Mbit/s multiplexing equipment CD4M/504. Power
requirements +12V, +5V, -5V at current to be advised. 4U
solderwrap card with 'J' width front panel. Parent
equipment CD4M/504. RD 1982.
GE020643 GE2/643 A-D
Clock
Pulse
Generator.
The
unit
performs
functions
of
clock recovery in a demultiplexer, operating in conjunction
with a detributary unit. It also contains an output stage
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