MN2
MN2M/7
MN2/50l
MN2/503
MN2/504
MN2M/505
MN2M/506
MN2M/507
MN2M/508
MN2M/508A
MN2/509
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Sound Transmitter Automatic Monitor used to compare the
programme input and output at a sound transmitter and
indicate an alarm when the difference exceeds a
pre-determined amount. PN3/23 with 2 UNl/l05, UN20/l4,
VNl/99, PS2/74D. DD 1968. DD Spec 5.137. DDHB 5.47.
EDI 10027NOV69. ACO. OBSOLESCENT.
Sync Pulse Monitor used in PAl/5l3. One input of mixed
sync pulses is compared with another to determine whether
it is synchronous, and output indicates condition.
CHl/12A, pegs 3, 9. DD 1963. DD Spec 8.141. DDHB 8.148.
ACO. OBSOLESCENT.
Television Automatic Monitor (Intercarrier) for 625 line
systems. Similar in operation to 405 line MNl/503. Used
with UHF television translators to switch on RF power
output stages when transmission from parent station
occurs. Monitors both sound and vision carriers. First
used EP7/504. Superseded by MN2/5l0. DD 1964.
DD Spec 5.89. OBSOLESCENT.
AGC Monitor used on BA13/506, BA13/508 to monitor both
sound and vision agc line voltages and operate a relay to
change over to another translator if they are abnormal.
CH1/12A. Mounted in PSlM/13. DD 1965. DD Spec 12.2.
OBSOLESCENT.
Television Transmitter Automatic Monitor used with Band IV
625 line transmitters. PN3/23 with UN13/503, UN20/501,
INS/501, IN2/50lA, UNl/565, PS2/9, EQl/509. DD 1965.
DD Spec 5.111. DDHB 5.41. ACO. OBSOLESCENT.
Television Automatic Monitor, Major (405/625 lines).
Operates an alarm if the received test line signal is
outside pre-set limits. 2 PN3/23 with PS2/50, UNl/540,
TE1/504, IN5/502, IN2/50l, UN13/504, GE2/552, UN9/534,
UN20/503,
UN20/504.
UN20/505,
UN20/506.
DD 1965.
DD Spec 12.22. ACO. OBSOLESCENT.
Sync Pulse Monitor used in MCCR Vehicle to indicate
whether video signals are synchronous or non synchronous.
Handles three input signals. CHl/13E with 3 UNl/523, 3
MN2/501, GE2/510, PS2/20, AM4/506A. DD 1966.
DD Spec 4.29. OBSOLESCENT.
Monitor, Television, Automatic, Minor, 625 lines. Detects
noise present in bottom of line sync pulses and variations
in amplitude of video signal from correct value. PN3/23
with
UN1/569,
UN20/507,
UN16/502,
IN2/501B,
PS2/49.
DD 1966. ACO. OBSOLESCENT.
405 line version of MN2M/508.
UN20/507~ UN16/502A, IN2/501B,
DD Spec 5.103. OBSOLESCENT.
PN3/23 with
PS2/49.
UNl/569A,
DD 1966.
Test Line Signal Automatic Monitor used in GE4M/5l8,
GE4M/518A to monitor the video distribution system and
sense whether a test signal already exists on the line on

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