MNl
MNl/503
MNl/505
MNl/505A
MNl/507
MNl/508
MNl/5l0
MNl/51l
MNl/512
MN2M/l
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Television Carrier Monitor to monitor sound and vision
carriers from a television transmitter and give alarm if
either fails. Mains operated. 102mm x l14mm x 57mm.
Input: 500~V r.m.s. vision carrier, 250~V r.m.s. sound
carrier. DD 1961. DD Spec 5.59. ACO. OBSOLESCENT.
Field Synchronising Pulse Monitor. Permits television
transmitters to switch on only when video signals with
field sync pulses are present on input line, and not when
line is being tested. 625 line system. Mains operated.
Includes UN16/523. CH1/12A. DD 1963. DD Spec 5.82.
ACO. OBSOLESCENT.
As MN1/505 but for 405
DD 1964. DD Spec 5.82.
DDTM 11.61. OBSOLESCENT.
UN16/523A.
DDHB 11.48.
lines. Includes
DDMI1l.73(72).
Transmitter Colour Alignment Monitor. Generates a test
line signal and adds it to a composite waveform for
feeding through a transmitter check receiver system and
back again for comparison. PN3/23 with DM1/504, GE2/535B,
MD2/504, PS2/l3F, OSl/502, GE4/530, AM4/5l1. DD 1967.
DDHB 11.35. WITHDRAWN.
Line and Field Sync Monitor for 405 or 625 line operation.
Operates alarm when line syncs fall below a preset level
and when field syncs are absent. Mains operated.
Replaces MN1/505. CH1/12A, pegs 3, 26. DD 1968.
DD Spec 12.36. DDHB 11.48, 11.61, 11.66, 11.74. ACO.
OBSOLESCENT.
VTR Head Clogging Monitor used on video tape machines to
detect head clogging and display various waveforms on a
picture
monitor.
PN3A/16C
with
UN20/526,
UN1/6l2,
PS2/l09B, 3 relays and plugs and sockets. DD 1970.
DD Spec 7.247. DDTM 7.167(71). OBSOLESCENT.
Sync Pulse Monitor directly replacing MNl/508 for 625 line
operation only. Differs from MN1/508 by having 2 relays
to separate the functions of TX start and video feed
changeover. CH1/12A, pegs 3, 26 as for MN1/508. DD 1971.
DD Spec 11.131.
DDMI2.436(77).
DDHB 2.429(77).
OBSOLESCENT.
UHF Power Monitor. For use with AM14/544, AM14/546 and
AM14/548. Printed circuit board in diecast box. DD 1972.
OBSOLESCENT.
MN2 AUTOMATIC MONITORS
Sound Automatic Monitor, Major used to give an alarm if a
fault occurs on a sound programme over a long line.
Sending end: PN3/23 with AM7/2, FL4/19, AMlM/16B, GEl/3,

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