UNl
UNl/66
UNl/67
UNl/68
UNl/69
UNl/70
UNl/7l
UNl/7lA
UNl/72
UNl/73A,73B
UNl/74
UNl/75
UNl/76
UNl/77
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Unit, 4 wire Termination, Switchable.
fitted with switch. CHl/18E. DD 1965/66.
As UNl/63
WITHDRAWN.
but
Isolating Unit used in MN2M/2 to isolate balanced
programme lines from unbalanced loads. CHl/18A with 2
LL/l06S repeating coils and 2 P.O. jacks. Pegs 1, 44.
DD 1966. DD Spec 5.166. ACO. OBSOLESCENT.
Phase Measuring Unit used to measure the phase of a
network at audio frequencies by a simple vector sum and
difference method. Portable wooden box. DD 1966.
WITHDRAWN.
4-wire Bridging
set in PAlM/SIC.
Unit used to connect a 2-wire telephone
CHl/18E. DD 1966. WITHDRAWN.
4-wire Termination Unit used
DD 1966. WITHDRAWN.
in PAlM/SIB.
CHl/18E.
Indicator Unit used to indicate condition of
MR-CE switching system. CHl/18C. DD 1966.
line in the
WITHDRAWN.
Similar
CHl/18C.
to UNl/7l
DD 1966.
but provides
WITHDRAWN.
remote
indication.
Clean Feed Unit used with desks of modular construction.
Provides 6 clean feed outputs and facilities for feeding
main input, cue programme or talkback to each output.
CHl/18E with 2 McMurdo Red Range 32 way connectors.
DD 1966. DD Spec 3.431. ACO. OBSOLESCENT.
Programme Meter Slugging Units for stereo peak programme
meters used with ME12/4. Printed board fitted as required
on back of PPM. A = first movement of PPM slugged, second
normal. B = first movement of PPM slugged and has normal
auxiliary PPM connected, second movement normal. DD 1966.
DD Spec 3.443. OBSOLESCENT.
Extender Unit used to extend supplied to RP4/2 for
mechanical alignment and test. 375mm x l7lmm plate with
brackets top and bottom carrying plugs and sockets, and
cover over wiring. DD 1966. WITHDRAWN.
Telegraph Combining Unit used in EP2M/l to give one output
from a speech channel input and a telegraph input. A
carrier input at 2.6kHz is modulated by the telegraph
signals to give a VF output or the unit will accept a VF
telegraph input. CHl/18C, pegs 15, 40. DD 1966.
DDMI 2.278. OBSOLESCENT.
Telegraph Splitting Unit used
telegraph signal from the
demodulate it to give a d.c.
41. DD 1966. DD Spec 2.279.
in EP2M/l to separate the VF
speech
channel
and
also
output. CHl/18C, pegs 15,
OBSOLESCENT.
Modem Unit used in EP2M/l. Contains 3 separate
modulators, each producing a double sideband, suppressed
carrier output. Normally used with OS2/2S. CHl/lSC, pegs

44