UN1
- 364 -
external timing reference. Printed circuit board with 33
way ISEP plug, coding 3, 13, 31. DD 1971. DD Spec 7.251.
OBSOLESCENT.
UN1/645
Minutes/Hours Digital Clock Unit used in GE1M/566 to
produce a BCD output for tens of minutes, hours, tens of
hours and hundreds of hours. Driven from UN1/644.
CH1/63, coding 15, 17, 21. DD 1971. DD Spec 7.252.
OBSOLESCENT.
UN1/648
Integrator Unit, used in MN2M/518A to integrate the output
of
IN2/504.
CH1/43A.
DD 1971.
DD Spec 11.124.
OBSOLESCENT.
UN1/650
UHF Mixer Unit for use in single mixer transposers.
CHI/57. DD 1971. OBSOLESCENT.
UN1/651
UN1/652
Recoded UN3/541. DD 1971.
Split Screen Control Unit used in EP5/509 for fraction
selection of wipes control volts and ramp simulation.
ISEP board with 33 way connector. DD 1971. OBSOLESCENT.
UN1/653
Digital Clock Unit used in EP1M/566 to
for seconds and minutes from an input of
UN1/644. 33 way ISEP board, coding 13,
DD Spec 7.249. OBSOLESCENT.
produce an output
logic pulses form
19, 23. DD 1971.
UN1/654
Analogue Store Unit used in EQ12M/503 to store
of correction vo1tages applied to EQ5/527.
DD 1971. DDMI2.43l(76). OBSOLESCENT.
the level
CHl/43A.
UNl/655
Sync Sampling Unit, deriving pulses equal to the half
amplitude duration of mixed synchronising pulses over a
range of video input signal levels. CHl/43. Coding pegs
1, 4, 12. DD 1971. DD Spec 11.143. OBSOLESCENT.
UNl/656
Transmitter Base Unit, part of TMlL/502, containing the
power regulators, delay modulation coder, and line driving
circuits. Unsupported printed wiring board for mounting
in PN3/53. Indexing positions 1, 2, 3 DD 1971.
OBSOLESCENT.
UNl/657
Transmitter Base Unit, part of TMlL/502, containing the
master oscillator and divider and some multiplexing
circuits. Unsupported printed circuit board for mounting
in PN3/53. Indexing positions 1, 2, 4. DD 1971.
OBSOLESCENT.
UNl/658
Receiver Base Unit, part of
regulators, line receiver
Unsupported printed circuit
Indexing positions 1, 2, 6.
RClL/507, containing power
and phase locked oscillator.
board for mounting in PN3/53.
DD 1971. OBSOLESCENT.
UNl/659
Receiver Base Unit, part of RClL/507, containing delay
modulation decoder and framing logic circuits.
Unsupported printed circuit board for mounting in PN3/53.
Indexing positions 1, 2, 7. DD 1971. OBSOLESCENT.

64