C02
- 82 -
OBSOLESCENT.
C02/546
Frequency Converter used in EP14M/s04 with a variable
oscillator to convert an input from the transmitter under
test to a 37.5MHz output for amplification by AM21/503.
The input from the transmitter can be modulated by an
external video generator. CH1/12A. DD 1970. WITHDRAWN.
C02/547
Frequency Converter used in Video Digital Equipment to
obtain clock frequency three times that of an input of PAL
colour
subcarrier
frequency.
CH1/12A,
pegs
47,
81.
DD 1970. WITHDRAWN.
C03 PHOTOELECTRIC CONVERTERS
C03/501
3-co1our Photo-electric Converter associated with UN16/s22
and
mounted
on
BA10/501.
Gives
3
independent
video
signals of 1V approximately for an input of 20
mi11i1umens. Box 260mm x 300mm x 200mm which fits to the
associated optical splitting device. DD 1970. WITHDRAWN.
C03/502
Photo-electric Converter which utilises a sOmm diameter 10
stage photomu1tip1ier (EMI type 9656) and associated
potential divider, together with emitter follower output
stage, and fits by bayonet action onto bushes on UN16/s22.
70mm overall diameter, 160mm long. DD 1970. OBSOLESCENT.
C03 Sub Group not available for new designs DD 1977.
=========================================================================
C04 DIGITAL CODE CONVERTERS
(Sub Group previously defined as "Pulse Converters" DD 1977).
C04/1
C04/502
DD 1972. WITHDRAWN.
Syne Pulse Converter used in AM18/504 to provide driving
pulses for AM18/S06. Input: 1V p-p of sync pulses or
composite video signal. Outputs: 2.sV p-p positive pulses
and 2.5V p-p negative pulses coincident with input syncs.
CH1/12A. DD 1961. DD Spec 6.99. ACO. OBSOLESCENT.
C04/503
Synchronising Pulse Converter. Part of C06/s01. Produces
405 line standard sync and blanking waveforms from 625
line standard waveform. Comprises 2 PN3/23 with eleven
CH1/12A units, PS2/s03A, AM4/506A. Six of the units
contain modulator sub-units UN1/s34 and/or UN1/s35.
DD 1963. DD Spec 10.1 DDHB 10.4. ACO. OBSOLESCENT.
C04/504
Synchronising Pulse Converter used in C06/s03 to lock the

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