DD 1966. WITHDRAWN.
As UN10/l0 but NORMAL/DISCONNECTED key is omitted and unit
is wired in NORMAL position. DD 1966. WITHDRAWN.
Telephone Unit, with
CH1/l8C, pegs 6, 43.
high voltage protection
DD 1967. DD Spec 2.260.
Voice Frequency Ringer Telephone Unit pre-set to receive
only a single tone from line and switch 17Hz ringing
current to local handset. Also switches tone to line on
receipt of 17Hz ringing from the office circuit. A
600Hz, 700Hz or 1900Hz. B = 450Hz, 777Hz or 860Hz.
Operates from either l2V or 24V supplies. Supersedes
DD Spec 2.274.
DDHB 2.177. ACO. OBSOLESCENT.
EMX Tie Circuit Telephone Unit used with a number of
UNlO/15. Includes cancel relays, tie-circuits engage
indication, etc. CH1/l8C with 2 Painton 15 way in-line
DD 1968/69. WITHDRAWN.
EMX Subscriber Telephone Unit providing facilities for
17Hz detection, engaged indication, ringing out,
acknowledge signal and interconnection with other
subscribers using two independent tie circuits. Can be
driven from any number of remote switchboards. CHl/18C
with 2 Painton 15 way in-line connectors, peg 10 only.
First used Bristol. DD 1968/69. WITHDRAWN.
EMX Subscriber (C.B.) Telephone Unit similar to UNlO/15
but for central battery working. CHl/18C, peg 10 only as
for UNlO/15. DD 1968/69. WITHDRAWN.
Telephone Coupling Unit used at remote points, such as
correspondents homes and unattended studios, in
conjunction with a PO forking key (No.J03A) to connect a
Uher Type 4000 recorder to a PO exchange line for playing
back tape to a studio centre. Eddystone box 102mm x 76mm,
with input and output plug cords and monitorinb headphones
permanently attached. DD 1968/69. WITHDRAWN.
Telephone Coupling Unit for connecting a studio output of
cue programme or talkback to a direct exchange line for
connection to a remote point. Eddystone box. DD 1968/69.
Local Telephone Unit for use
No.7l3. Includes ringing
Printed circuit board,
with UNlO/12 and PO Telephone
55mm x 95mm. SCPD 1972.
External Line Telephone Unit for use in television studio
T.M. telephone panel in conjunction with UNlO/2l and
Provides call/answer buttons and external
switching buttons to five local extensions and three