PAl7
PA17/15
PA17/16
PA17/17
PA17/18
PA17/19
PA17/20
PA17/21
PA17/22
PA17/23
PA17/24
PA17/25
PA17/26,A-D
PA17/27
- 278 -
pairs. 1957. OBSOLESCENT.
Used for monitoring system in Regional Control Rooms.
Switches headsets of either of two operators to either
telephone or monitoring systems with provision for
monitoring on loudspeakers to check receivers via a
sequential monitor. First used at Glasgow with DK3/3 and
RLP/19A. 1957. DD Spec 3.161. OBSOLESCENT.
Provides two channel telephone circuits for Continuity and
Control
Positions
with
facilities
for
extending
and
paralleling calls and feeding cue programme. Includes
RLP/3l. First used at Glasgow. 1957. DD Spec 3.158.
OBSOLESCENT.
Used at Divis and controlled from Belfast for switching
radio link receivers. 1957. OBSOLESCENT.
Used at Snaefell with PA6/4 to switch television receivers
and UHF transmitters controlled by VF signalling from
PA1/20 at Douglas. 1957. DD Spec 3.162. OBSOLESCENT.
Accommodates telephone and signalling relays for
Continuity and Control Positions, including EMX telephone,
Recording Room telephone and two studio signalling
circuits.
First
used at Glasgow.
1957.
DD Spec 3.159.
OBSOLESCENT.
Accommodates relays for programme, monitoring and talkback
for Control Positions. First used at Glasgow. 1957.
DD Spec 3.162. OBSOLESCENT.
Accommodates monitoring, talkback and telephone relays for
Continuity Announcer's Position. First used Glasgow.
DD 1957. DD Spec 3.166. OBSOLESCENT.
Used for Continuity Studio Programme Circuit at Glasgow.
DD 1957. DD Spec 3.165. OBSOLESCENT.
Accommodates slave relays and indicator lights used with
BX5/5 at Snaefell controlled by BX6/l at Douglas for Home
Service receiver switching. 1957/58. OBSOLESCENT.
Accommodates slave relays, hybrid coild etc., used in
conjunction with BX5/6 at Carlisle and controlled by BC6/3
at Sandale for emergency programme switching. 1957/58.
OBSOLESCENT.
Used for remote control of Light and Home Programmes.
1957/58. OBSOLESCENT.
Used for vision and sound feed remote switching between
Bristol and Cardiff and transmitters at North Hessary Tor
and Rowridge to give appropriate television Regional
Programme items. Controlled by PA6/5, PA6/5A and PA6/5B
at Cardiff and Bristol. 1957/58. OBSOLESCENT.
Used for switching of feedback programme at Bush House.

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