- 281 -
PA17
control of
Manchester.
unattended transmitters.
1959. OBSOLESCENT.
First
used
PA17/66
Despatch position output engagement relays.
BA2/5. DD 1959. DD Spec 3.258. OBSOLESCENT.
Used on
PA17/67
Despatch position programme circuit relays and hybrid
transformers for insertion of tone to input of 5 channels
and division of each channel output to main programme and
conference circuit inputs. Used on BA2/5. DD 1959.
DD Spec 3.259. OBSOLESCENT.
PA17/68
Despatch position source signalling relays for destination
end of standard source signalling circuit for 5 channels.
Used on BA9/l6. DD 1959. DD Spec 3.260. OBSOLESCENT.
PA17/69
Despatch position control line relays.
DD 1959. DD Spec 3.255. OBSOLESCENT.
Used on BA9/l6.
PA17/70
Despatch
BA9/l6.
position operators' telephone relays.
DD 1959. DD Spec 3.255. OBSOLESCENT.
Used on
PA17/7l
Despatch position monitoring relays.
DD 1959. DD Spec 3.256. OBSOLESCENT.
Used on BA9/l6.
PA17/72
Despatch position
BA9/l6. DD 1959.
monitoring selection relays.
DD Spec 3.256. OBSOLESCENT.
Used on
PA17/73
Despatch
BA9/l6.
position conference circuit relays.
DD 1959. DD Spec 3.257. OBSOLESCENT.
Used
on
PA17/74
Despatch position conference circuit relays.
BA9/16. DD 1959. DD Spec 3.257. OBSOLESCENT.
Used on
PA17/75
PA17/76
Line Relay Panel used at Wrexham. 1959. OBSOLESCENT.
Sending Unit used for remote switching from Norwich of
vision and sound feeds of Peterborough transmitter. 1959.
OBSOLESCENT.
PA17/77
Receiving Unit for remote switching from Norwich of vision
and sound feeds of Peterborough transmitter. 1959.
DD Spec 2.128. OBSOLESCENT.
PA17/78
Used for tone selection at sending terminal on voice
frequency switching scheme. 24 relays. 1959.
DD Spec 2.136. OBSOLESCENT.
PA17/79
Used for tone selection at sending
frequency switching scheme. 18
DD Spec 2.137. OBSOLESCENT.
terminal
relays.
on voice
1959.
PA17/80
Priority Unit containing Exclusive Circuit relays used at
sending end in voice frequency switching scheme. 1959.
DD Spec 2.138. OBSOLESCENT.
PA17/81
EMX Tel. and Misc.
PA17/93 on BA9/l7
Relays. Associated with PA17/82 and
in Mixer Suite EP5/4. 1959. DD

81