UN8
UN8/12
UN8/13
UN8/14
UNS/15
UNS/501
UN8/502
- 37S -
state of the system. CH1/ISC. DD 1965/6S. WITHDRAWN.
Line Bridging Signalling Unit used on the signalling
system between London Control Room and Droitwich
transmitter. Contains a Hughes Bridge Filter, 082/26
(S.2kHz), and a tone switch. CHl/lSC, pegs 17, 32.
DD 1965/6S. WITHDRAWN.
Signalling Tone Unit used in PA19/7, PA19/S. Gives a
pulses call modulated with approximately 2kHz. Pulse and
modulation frequencies can be varied. Printed board, 89mm
x 44mm x l3mm, with edge connectors. DD 1965/6S.
WITHDRAWN.
Source Signalling Unit used in PA8/322
signalling to a studio from continuity
green "buzz". Printed board 54mm x
DD Spec 3.533. ACO. OBSOLESCENT.
for
and
5lmm.
red light
for return
DD 1970.
Cue Selection Signalling Unit for Type D studio control
desks.
Contains 3 individual cue keys and a
master
cue
key. CH1/37. SCPD 1970. OBSOLESCENT.
Used to operate an alarm when sync pulses of a video
signal fall below a pre-determined level irrespective of
picture content. Printed wiring. Mains operated. 19lmm
x l2lmm x 57mm. DD 1960. OBSOLESCENT.
Used with MN2M/506 to give remote indication of nature of
fault. CHl/12A. DD 1965. WITHDRAWN.
==========================================================================
UN8 Sub Group not available for new designs. DD 1977.
UN9/l
UN9/2
UN9/4
UN9/5
UN9/6
UN9/7
UN9 SWITCH UNITS
Manual Switch used on PS3/3 for similar purpose, to SUM/l.
DD 1956/63. DD Spec 2.111. OBSOLESCENT.
Automatic Switch used on PS3/3 for similar purposes to
SUA/I. DD 1956/63. DD Spec 2.111. OBSOLESCENT.
Manual Switch Unit used on PS3/17.
DDHB 2.97. OBSOLESCENT.
DD 1956/63.
Automatic
changeover
DD 1956/63.
Switch Unit used on PS3/l7 when automatic
is required if one power supply unit fails.
DDHB 2.97. OBSOLESCENT.
Used on DK4/5 for pedal-operated cue light switches.
DD 1956/63. OBSOLESCENT.
Telephone Switch Unit used in AMl/6 with STC Headset, Type
4409A to communicate with speaker. CHl/18C. DD 1963/64.

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