UNl
340 -
Provides repeating coils and equaliser when 4 wire
terminating equipment is required at small stations.
DD 1960. DD Spec 2.168. OBSOLESCENT.
UNl/15
Temperature Control Unit (including oven). Comprises a
small crystal oven and a separate small transistor d.c.
amplifier which supplies it with heating current
controlled by a thermistor in the oven. Supply is 6.3V
a.c., 0.75A maximum. DD 1961. DD Spec 5.55. ACO.
OBSOLESCENT.
UNl/15A
Temperature Control Unit (including oven). Comprises a
small crystal oven and a separate small transistor d.c.
amplifier, controlled by a thermistor in the oven, which
supplies it with heating current. BXl/4 for mounting in
CHl/27. DD 1964. DD Spec 5.73. OBSOLESCENT.
UNl/16
Alarm Unit which provides an alarm when a normally applied
50c/s
signal
is
removed.
DD 1961.
DDHB 2.102.
OBSOLESCENT.
UNl/17
DD 1961. CANCELLED.
UNl/18
Unit, Bulk Eraser for Magnetic Tape and Film. DD 1961.
DDHB 1.34. OBSOLESCENT.
UNl/19
Unit, Relay and Voltage Dividing used on PAl/28 and PAl/29
in OTl/3. DD 1961. DD Spec 2.172. OBSOLESCENT.
UNl/20
Time Delay Unit, 3
non-intersync machines
Transistors: 2 OC203.
sec., used with UNl/5l6 on Ampex
to give approximate picture sync.
DD 1962. WITHDRAWN.
UNl/2l
Sequential Tone Sender Unit. Sends tones of 60Hz, 900Hz,
5kHz, 10kHz in repeating sequence. CHl/18E. Superseded
by UNl/13l. DD 1962. DD Spec 3.355. ACO. OBSOLESCENT.
UN1! 23
UNl/22
UNl/24
Compression Unit used in AMl/6. CHl/18C. DD 1963. ACO.
WITHDRAWN .
UNl/25
Fuse and Indicator Unit used in PS2/l6 for the 24V "w"
supply provided by one of the PS2/l5. CHl/12A, pegs 2,
23. DD 1963. DD Spec 4.40. ACO. OBSOLESCENT.
UNl/26
Fuse and Indicator Unit used in PS2/l6 for the 24V "A" and
"B" supplies from the two PS2/l5 and their combination
which it produces to give the "Shared" supply. CHl/12A,
pegs 2, 25. DD 1963. DD Spec 4.41. ACO. OBSOLESCENT.
UNl/27
Stabiliser Unit. Two are used with PS3/23 to provide two
l8V, 2A stabilised supplies (positive and negative) for a
transistorised frame scan unit. CHl/12A. DD 1963.
Star
Mixer
Switching
Unit
used
on
DK4 /5.
DD 1963.
OBSOLESCENT.
 
 
 
 
 
 
 
Line
Bridging
Unit
used in
AMl/6.
 
CHl/18C.
DD 1963.
ACO.
WITHDRAWN.
 
 
 
 

40