~1
AT1/502
AT2/1
AT2/2
AT2/3
AT2/4
AT2/5
AT2/6
AT2/7, A
AT2/8
AT2/9
AT2M/9A
AT3/501
AT3/502
- 44 -
Dither Signal Attenuator used in conjunction with GE1/563
in Video Digital Equipment. Different settings correspond
to different numbers of digits used in the system.
CH1/12A, pegs 47, 82. DD 1970. WITHDRAWN.
AT2 AUDIO FREQUENCY ATTENUATORS
Rack Mounted Panel fitted with five
attenuators PB/21M1. Originally used on
replaced by AT2/5. DD 1956. DD Spec 3.132.
variable 600~
BA6/1 but now
OBSOLESCENT.
Used on te1erecording to
three cameras. DD 1956.
distribute
OBSOLESCENT.
incoming
sound
to
DD 1956. CANCELLED.
483mm panel version of AT/25.
DD 1956. OBSOLESCENT.
Includes 4 PB/7B1.
Assembly of 12 variable attenuators PB/2lM1 used on the 12
equaliser chains on OB bays BA3/1 and BA6/1A at Television
Centre
and
Regional
Control
Rooms.
DD 1958.
TI.L.4.
OBSOLESCENT.
Used with mcirophone AKG Type C28 as part of OT1/2.
DD 1959. OBSOLESCENT.
Variable Attenuators used on PA1/42. Comprises CH1/18C
with PO/lONN1/S and PO/11NN1/S. AT2/7A also includes
crosstalk filter similar to FL4/6. DD 1964.
DD Spec 2.219. TI.L.3. OBSOLESCENT.
Used on EP6/501. DD 1964. OBSOLESCENT.
Used in MD2M/505. Includes a variable attenuator,
p1uggab1e attenuator, bias video signal and a PS2/51.
CH1/12A, pegs 2, 37. DD 1966. DDMI 12.17. OBSOLESCENT.
As AT2M/2 but with network across 15V rail to provide bias
vo1tages for MDlM/505. DD 1967. WITHDRAWN.
AT3 VIDEO FREQUENCY ATTENUATORS
Used in AMl/504.
DD Spec 8.68. ACO.
controlled.
DD 1961.
Remotely
OBSOLESCENT.
Used as a remotely controlled fader in a 75~ line,
utilising variations in resistance of a photo-electric
cell with incident light changes. Includes AT3/503 and

44