~9
UN9/590
UN9/601
388 -
enable the input of the equipment to be
required carrier circuit. Special Imhof
high, 76mm wide. DD 1971. OBSOLESCENT.
switched to a
chassis l78mm
Logic Switch Unit, used in CD2M/5l0 to perform the code
sequence switching. CHl/63, pegs 1, 3, 11. DD 1972.
DDMI 2.404. OBSOLESCENT.
DD 1975. CANCELLED.
==========================================================================
UN9 Sub Group not available for new designs. DD 1977.
UN10/l
UNlO/2
UNlO/3
UNlO/4
UNlO/6
UNlO/7
UNI0/8A~F
UNlO/9A
UNlO/9B
UNlO/lO
UNlO TELEPHONE UNITS
Used for transmission of recordings by line.
OBSOLESCENT.
DD 1956.
Voice Frequency Ringer
PN3/3 to replace VFR/l.
OBSOLESCENT.
used in association with PS3/6 on
DD 1958. DD Spec 2.119. TI.L.2.
For operator's headsets and handsets with normal
transmitters and 3 wire cords and handsets with
differential transmitters and 4 or 5 wire cords.
Supersedes TLU/4. DD 1958/59. DD Spec 3.216. ACO.
OBSOLESCENT.
Four wire Terminating and Ringing Unit. Replaces FWTR/l.
Plug in chassis. Mounts on PN3/ll. DD 1958/59.
DD Spec 2.126. TI.L.2. OBSOLESCENT.
Portable Telephone and Signalling Unit used between
commentator's position and control point at OB's.
DD 1962. DD Spec 3.320. TI.SX.6. OBSOLESCENT.
Used with Pendant Telephone PO No.713 and No.246 and
Operator's Headset STC Type 4409A. Not suit; ')le for use
with handsets with differential transmitters. Mounts on
flat surface or on CH1/2l. First used DK4/5. DD 1962.
DD Spec 3.328. ACO. OBSOLESCENT.
Superseded by UNlO/13A, UNlO/13B. DD 1965. OBSOLESCENT.
Telephone Ring Unit used to ring out from Carlisle to
Manchester or Sandale. CHl/18C with OS2/26 adjusted to
777c/s, and key switch. Accommodated in PSlM/51B.
DD 1966. WITHDRAWN.
Similar to UNlO/9A but OS2/26 is adjusted to 700c/s to
ring out from Carlisle to Manchester or Glasgow.
Accommodated in PAlM/SIC. DD 1966. WITHDRAWN.
Telephone Unit used in PA2M/7.
CHI/l8C, pegs 6, 43.

88