UN1/128
UN1/129
UN1/130
UN1/131
UN1/133A
UN1/138
UNl/140
UN1/141A
UNl/14lB
UN1/142A
UNl/142B
UN1/143A
UN1/143B
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UN1
47, 69. DD 1970. DD Spec 2.353. ACO. OBSOLESCENT.
Tone Source Line Bridging Unit used
remote switching system to send 10.5kHz
operate
remote
unit.
Similar
to
DD 1970. WITHDRAWN.
on Bristo1-Mendip
tone to line to
UNIM/65. CHJ/18.
Pulse Unit used with OS2/31, OS2/3lA to produce pulsed
outputs of 23kHz or 19kHz. Mark timing 1.5 to 3 seconds,
space timing 1 to 2 seconds, as adjusted on test. Printed
board for fitting inside OS2/31, OS2/31A. DD 1970.
WITHDRAWN.
Automatic Fault
with PA2M/9.
WITHDRAWN.
similar to UN1/127 but for use
DD 1970. DD Spec 2.366.
Reporter
CH1/18C.
Sequential Tone Sender Unit for switching between 4 input
tones and a silent position, with adjustable dwell tones.
Replaces
UN1/2l.
CHl/12B
or
CHl/18E.
DD 1970.
DD Spec 3.538. WITIIDRAWN.
As UNl/133 except for replacement of one capacitor by wire
link. For use in channel 1 position of EP2M/4. DD 1972.
OBSOLESCENT.
Start Tape Unit for remote start
tape
machines.
Includes
lamps
machines are set in recording or
SCPD 1971. OBSOLESCENT.
failities for up to 8
to indicate whether
replay mode. CH1/37A.
Group Interface Unit, used in Type D sound desks to accept
mixed output from a number of modules PA8/350, compensate
for their loss and produce an output signal at a suitable
impedance for direct connection to the group modules.
Diecast box, containing AM5/7 and associated transformers.
SCPD 1971. OBSOLESCENT.
Dummy Unit, replacing Imhof chassis in PCM Coder BAl/4 and
Decoder BAl/S. Special Imhof front panel 30.5mm wide for
l33mm panel with board and plug. DD 1971. OBSOLESCENT.
As UNl/14lA, but less plug. DD 1971. OBSOLESCENT.
Dummy Unit, used in place of an Imhof chassis in PCM Coder
BAl/4 and Decoder BAI/S. Special Imhof front panel 30.5mm
wide for
l78mm
panel
with
board
and
plug.
DD 1971.
OBSOLESCENT.
As UN1/142A, but less plug. DD 1971. OBSOLESCENT.
Dummy Unit, used in place of an Imhof chassis in PCM Coder
BAl/4 and Decoder BA1/S. Special Imhof front panel 30.5mm
wide for 222mm panel with board and plug. DD 1971.
OBSOLESCENT.
As UNl/143A, but less plug. DD 1971. OBSOLESCENT.

49