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Time Integrator and G.T.S. Control Bay. Accommodates
relays for operation of 12 and 24 hour direct reading
clocks and G.T.S. units. Type 12 bay with BX5/15, BX5/16,
BA5/19, and 2 of each type BX5/13, BXS/14, BX5/17, BX5/18
and PA1/25, PA6/13, PA16/3. Broadcasting House Extension.
DD 1956/58. DD Spec 3.304. OBSOLESCENT.
BA4 Sub Group not available for new designs DD 1977.
BA6 EQUIPPED LINES TERMINATIONS BAY
Equipped for four main OB channels and eight smaller
channels. Type 12 bay with AT2/5, CSM/2, DBA/1005, 8
ET/9A, FLP/5A, JF/111, 2 JF/115, KL/32A, 2 RM/4A, TP/10A.
Top cable entry. DD 1959. TI.L.4. OBSOLESCENT.
As BA6/1 but for bottom entry. DD 1959. DD Spec 3.134.
Incoming Lines Termination Bay for 30 circuits. Comprises
FW2/3 with MDP/5, PN3/23 with 30 amplifiers, PN3/23 with
30 equalisers in CH2/2, 2 U-1ink panels, 3 panels equipped
with LL/63RD repeating coils. DD 1967. OBSOLESCENT.
Outgoing Lines Termination Bay for 30 circuits. FW2/3
with MDP/5, PN3/23 with 30 amplifiers, 2 U-1ink panels, 2
attenuator panels, 3 panels equipped with LL/64RD
repeating coils. DD 1967. OBSOLESCENT.
Incoming Lines Termination Bay for equalising and
amplifying to OdB level 10 incoming PO lines. FW2/3A with
5 PA1/4l, 2 PS2/49, filters, coils, etc. DD 1968.
Outgoing Lines Termination Bay for accepting a OdB signal
for transmission to 20 outgoing PO lines. FW2/3A with 2
AM7/2A, 4 PS2/49, filters, coils, etc. DD 1968.
BA6 Sub Group not available for new designs DD 1977.
BA7 EQUIPPED MOTOR BAY
Used with S.C.R.E.'s Desk DK3/1 at Bush House.
AMS/l, 4 MNA/3, 3 RLP/19A, 1 PA17/l and
DD 1957. DD Spec 3.143. OBSOLESCENT.
Type 9 Bay with Siemens switching apparatus for selection