UNl/633
UNl/634
UNl/635
UNl/636
UNlM/638P
UNl/639
UNl/640
UNl/64l
UNl/642
UNl/644
- 363
~l
switching to
OBSOLESCENT.
front of
CHl/12A.
DD 1970.
unit.
Gating Unit used in UNlM/638P in conjunction with GE2/600
for separating the selected portion of active line period
from the rest of the television signal. CHl/46B, pegs 47,
76. DD 1970. DD Spec 9.138. OBSOLESCENT.
Cursor Drive Unit used in EPlM/52l to move the cursor down
the screen so that data can be read from the ANCHOR store.
33 way ISEP board, coding 3, 11, 29. DD 1970.
DD Spec 7.241. OBSOLESCENT.
Filter and Video Amplifier Unit used in EPlM/525 to limit
the bandwidth of the video signal applied to COl/503.
Contains a 5.5MHz low pass filter and isolation amplifiers
giving overall unity gain. Also includes a dither adding
circuit for adding low amplitude signals to the output.
254mm x l78mm board. DD 1970. WITHDRAWN.
Filter and Equaliser Unit used in EPlM/525. Includes a
5.5MHz filter to remove unwanted frequency components from
the output signal of COl/504, and also compensates for
high frequency losses inherent in the box-car form of the
output signal. CHl/12A. DD 1970. WITHDRAWN.
Gated Noise Measuring Unit. Used in conjunction with
MElM/503 to measure noise in the presence of a test
signal. Comprises PS2/l3R, UNl/633, GE2/600 mounted in
CHl/33
in
CS2/llA.
DD 1970.
DD Spec 9.137.
DDTM 9.94(72). OBSOLESCENT.
Routing Switch Unit used in OB vehicles modified for
colour separation overlay. Produces, from information
derived from one of the preview selection switches, the
control voltages required for B-Y routing and for putting
the composite signal on the air. Printed circuit board
5lmm
x
l65mm.
DD 1970.
DD Spec 8.405.
ACO.
OBSOLESCENT.
Video Switch and Delay Unit used in OB vehiclns modified
for colour separation overlay. Selects one of six inputs
by a series of relays and delays the selected signal by up
to
970ns.
CHl/12A.
DD 1970.
DD Spec 8.404.
ACO.
OBSOLESCENT.
Recorder Drive Unit used in EPlM/52l to allow data in the
ANCHOR Store to be used externally. 33 way ISEP board,
coding 7, 13, 17. DD 1970. DD Spec 7.244. OBSOLESCENT.
UHF Receiver Unit. Improved version of UNl/604, suitable
for measuring and monitoring UHF transmissions. CHl/12A.
DD 1971.
DD Spec 5.205.
DDTM 5.73.
EDI 10089(1)MAY7l.
ACO. OBSOLESCENT.
Seconds Digital
BDC output for
second from an
Clock Unit used in GElM/566 to produce a
tenths of a second and hundredth of a
input of either field drive pulses or an

63