da1ay of 1.0~s, used with a
CH1/12A, pegs 20, 32. DD 1967/68.
Bias and Oscillator Unit used in EP14/501 to adjust the
bias of MDl/503A. Also includes a 33.07MHz
crystal-controlled oscillator for use on 3 tone tests.
CH1/39A. DD 1968. DD Spec 6.146. OBSOLESCENT.
Waveform Sampling Unit used in conjunction with EPlL/508
to facilitate measurement of differential gain and phase
when noise is present in the video waveform. Modified
CH1/12C. DD 1968. WITHDRAWN.
Dispersal Waveform Cancellation Unit used to remove a low
frequency waveform from a composite video signal by a
process of sampling, inversion and re-addition. CHl/12A.
DD 1968. DDHB 11.58. WITHDRAWN.
Colour Matrix Termination Unit used with UNl/577 and
UNl/577A to permit colouring signals to by-pass the
matrix. Contains 3 delay sections and relays, with plugs
and sockets, on a mounting slightly deeper than PN3A/2.
DD 1968. DD Spec 8.312. ACO. OBSOLESCENT.
Flywheel Sync Unit used in C06/504 to process 2V input
syncs to give 2V output syncs, 525/625. CH1/12A, pegs 23,
40. DD 1968. WITHDRAWN.
Frequency Counter Unit used in MN7M/504.
835 Counter in carrying case. DD 1969.
DD Spec 9.115.
UHF Receiver Unit, Bands IV and V.
but with improved performance and AFC
DD Spec 5.168.
Similar to UN1/584A
to assist tuning.
Parametric Divider Unit, electrically as the parametric
dividers of UN15/50l. Used in UN15/S03. Printed circuit
board, ll7mm x 30mm. DD 1969. DD Spec 4.56. ACO.
Decade Counter Unit used for decade count of footage or
cue dots in footage counter associated with Automatic
Cinemascope Equipment. ISEP board with 33 way plug.
DD 1969. WITHDRAWN.
l27mm Television Receiver Unit used in RClM/505. Contains
power supplier, audio amplifier, AGC measuring circuit,
line standard selection circuits, input and output
sockets. CH1/12B. DD 1969. DD Spec 5.178. OBSOLESCENT.
Line Erase Unit for bridging across 75~ video cable to
erase lines which follow trigger pulses (fed from line
selector unit) by connecting to low impedance black level
source derived from "back porch". Mains operated.
CH1/12A, pegs 28, 35. DD 1969. DD Spec 11.73. ACO.