UN3
- 370 -
UN3/2l
Electrostatic Microphone Control Unit for remote control
of the polar diagrams of four monophonic electrostatic
microphones (AKG C12 or Cl2A) or two stereophonic
microphones (AKG C24). May be used in conjunction with
AKG power suppliers or BBC power suppliers of the
PS2/75-UNl/l10 system. CHl/37A. SCPD 1968. OBSOLESCENT.
UN3/22
Tape Start Control Unit providing remote start facilities
for up to 5 tape machines, and with lamps to indicate
whether machines are set up to record or replay. CHl/37A.
DD 1968. WITHDRAWN.
UN3/25
Bias Control Unit used in EP7/5l2 for the power amplifier
stages. Provides bias control for 3 AMI4/Sl6 and contains
voltage determining networks for other units. CHl/26A
fitted to PNl/12. DD 1969. WITHDRAWN.
UN3/26
Interchange Relays Control Unit for controlling the
interchange relays on PA17/l66. Printed board 102mm x
5lmm. DD 1969. DD Spec 3.497. OBSOLESCENT.
UN3/28
Reset Control Unit used in PA2M/7A to reset transmitters.
CHl/l8C,
pegs
56, 57.
DD 1970.
DD Spec 2.354.
ACO.
OBSOLESCENT.
UN3/29
Iris Control Unit for controlling, by e1ectro-mechanical
means, the aperture of the lens in a "back projection".
An electric motor coupled to the iris ring is controlled
by an electronics unit in a box containing two printed
boards, coding 9, 11, 19 and 9, 11, 21 respectively.
DD 1970.
DD Spec 1.86.
DDTM 1.73.
EDI l0085(1)FEB71.
OBSOLESCENT.
UN3/30
Central Control Unit for PA2M/9.
DD Spec 2.363. WITHDRAWN.
CHl/18C.
DD 1970.
UN3/3l
Peripheral Control Unit for PA2M/9. Modified version of
UN3/l3. CHl/18C. DD 1970. DD Spec 2.362. WITHDRAWN.
UN3/32
Logic Changeover Control Unit used in PA1/72 for automatic
changeover to spare FM drive (EP7M/10) on failure of
pre-selected main drive (also EP7M/10). Inc_udes manual
override.
Eddystone
box.
DD 1971.
DD Spec 5.196.
OBSOLESCENT.
UN3/32A
Logic Changeover Control Unit, similar to UN3/32 but for
operation with a relay supply at +23V instead of -50V.
Diecast box. DD 1971. OBSOLESCENT.
UN3/34
Data Send Timing Control Unit used in
pulses for the control of a coder
circuit board with 64 way connector
133mm panel. DD 1972. OBSOLESCENT.
BAl/4 to derive
UN23/l7. Printed
for special Imhof
UN3/35
Remote Start Control Unit, used in DK2/l8 to control Rola
Plessey
cartridge
machines.
Diecast
box.
SCPD 1972.
OBSOLESCENT.

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