UN9
- 384 -
Time mu1tip1exes 2 PAL chrominance signals into one
signal, and includes a burst-locked oscillator, to drive
DMl/502. CH1/12A, pegs 5, 44. Used in UN20L/508.
DD 1966. DD Spec 8.247. ACO. OBSOLESCENT.
UN9/543
Caption SynthesiseI' Switch Unit used on desk panels to
control EP1/506. Comprises two NSF Type 130 switches held
together by small links.
DD 1966.
DD Spec 8.243.
ACO.
OBSOLESCENT.
UN9/544
RGBY Switch Unit for sequentially sampling 4 input
signals, composite or non-composite, at 625 line rate.
Produces output trigger pulses at one-fifth line frequency
to indicate start of sampling sequence. Mains operated.
CHl/26B,
pegs
7,
43.
DD 1966.
DD
Spec 8.248.
DDHB 8.227. ACO. OBSOLESCENT.
UN9/545
Sub carrier
Switch
Unit
used
with
GE4M/524.
Accepts
outputs of GE2/553 together with a subcarrier feed, and
generates four feeds of subcarrier corresponding to the
four axes of a colour subcarrier system, and also a
conventional colour burst of subcarrier. CH1/12A, peg 4.
DD 1966. DD Spec 8.259. ACO. OBSOLESCENT.
UN9/546
NTSC Vector Switch Unit
NTSC composite colour
multiplexed chrominance
CHl/12A, pegs 14, 34.
OBSOLESCENT.
used in UN20L/508A. Accepts two
signals and produces one time
signal and a reference subcarrier.
DD 1967.
DD Spec 8.249.
ACO.
UN9/547
Remote Switch Unit used to select either of 2 waveforms of
GE4M/53l on application of a trigger pulse from any of 10
sources. CHl/12A. DD 1967. WITHDRAWN.
UN9/548
Sub carrier
Phase
Switch
Unit used in
conjunction
with
UN1/583. Accepts input of subcarrier and composite video,
and switches the subcarrier phase to the same quadrant as
a
reference
in
the
video
signal.
CHl/l2A.
DD 1967.
WITHDRAWN.
UN9/549
Video Sw:ttch Unit containing two video switches for video
signal routing in Field Store Standards Converter.
Printed board. DD 1967. OBSOLESCENT.
UN9/550
Video Switch Unit used in Field Store Standards Converter
for routing video signals from quartz delay lines through
either an equaliser or an attenuator included in the unit.
Printed board. DD 1967. OBSOLESCENT.
UN9!551
Error Signal Switch Unit used in EQl2M/502 to prevent the
addition of a correcting error signal to the input video
signal when predetermined ratios of chrominance amplitude
and error
amplitude
are
exceeded.
CH1/12A.
DD 1967.
WITHDRAWN .
UN9!552
Video Switch Unit used in EP5/507 to provide video inlay
timing. Has a relay operated direct path, via a l2dB
attenuator and delay trimming network, and a delayed path

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