UN2l
UN2l/30
UN2l/3l
UN2l/32A
UN2l/32B
UN2l/33A
UN2l/33B
UN2l/34
UN2l/50l
UN2l/502
UN2l/503
UN2l/504
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SCPD 1971.
WITHDRAWN.
Programme Changeover Relay Unit (Regions)
override key to change programme feeds
transmitters during Open University (Radio)
Associated with UN2l/3l. CHI/52, pegs
SCPD 1971. OBSOLESCENT.
with manual
to Radio 3
broadcasts.
2, 3, 4.
Control Relay Unit
CHI/52, pegs 2, 3, 5.
(Regions) for controlling
SCPD 1971. OBSOLESCENT.
UN2l/30.
Cue Lamp Relay Unit suitable for use in CA4/6A, CA4/6B.
Provides PBX mute, PBX and EMX call, Red Master and one
Green cue lamp relays. Printed board 300mm x l50mm with 6
plug in relays, with 2 changeover heavy duty meains
switching contacts. PBX mute operates on switch on, but
each other relay has a d.c. amplifier for low current
operation. SCPD 1971. OBSOLESCENT.
As UN2l/32A but only the EMX call
the other relays operate with
SCPD 1971. OBSOLESCENT.
relay has an amplifier;
22mA from full earth.
Cue Lamp Relay Unit with 6 cue lamp relays, each with d.c.
amplifier for low current operation. Similar construction
to UN2l/32A. SCPD 1971. OBSOLESCENT.
Similar to UN2l/33A,
operation from full
OBSOLESCENT.
but
earth
without amplifiers, for relay
taking 22mA. SCPD 1971.
Presenters' Intercom Relay Unit, housing the relays and
associated interlock circuits corresponding to the three
presenters' Intercom keys on the desk DK2/l8. Sockets on
front panel enable patched connections to be made between
any of the keys in three or more continuity suites
EPlO/17. CH1/18C, with coding pegs 48, 84. DD 1971.
DDTM 3.123. OBSOLESCENT.
Relay Unit used adjacent to amplifiers etc. when full
facilities provided by PA17/503 and other relay panels are
not required. Contains 6 STC 4190 relays, 7 p~n type 159
plug, 15 pin type 159 socket, 13 PO No.l Musa plug.
Chassis fits one module of PN3/23. SCPD 1967.
OBSOLESCENT.
Colour Caption Relay Unit used in television continuity to
select
caption
colours
generated
by
EP1/506.
Colour
selections
are variable and
can
be
pre-set.
CHl/12C.
DD 1967/69. WITHDRAWN.
Buffer Relay Unit used in EP6/503 to provide buffering
action between the command circuits and the 5 wire
transmission system linking the studio terminal and
te1ecine, and between UN23/509 and the indicator lamps on
PA8/514. CH1/l2A. DD 1967/69. OBSOLETE.
Relay Unit used to combine outputs of 2 video matrices to

110