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  TM 11-5805-424-15/NAVSHIPS 0967-220-9012/TO 31W2-2G-41
C2
includes OR gate GOB-1 and amplifiers
above).
The high-level output of
IN-5 and IN-6. A high-level input (+ 6
2second delay Q11, Q12 is also
volts) applied from any of the four alarm
inverted by amplifier IN-11 and applied
circuits (b through e above) enables GOB-
as a ground to LOSS OF REC
CARRIER ALARM output terminals to
1, providing a high-level output that is
activate an external loss-of-receive-
inverted by amplifier IN-5 and applied as
carrier alarm.
a low level to light ALARM lamp 1A1DS2.
(3)
The loss-of-receive-carrier alarm may be
(2)
By strapping terminals 2 and 3 together,
deactivated by applying a high level ( + 6
the common alarm enable level is
volts) through OR gate GOC-1 to
inverted by amplifier IN-6 and applied as
amplifier IN-9, which keeps 2-second
a
low
level
(ground)
to
the
delay Q11, Q12 deactivated ((1) above)
SYNCHRONIZER DISABLE OUT output
and holds ALARM indicator lamp 1AlDS2
terminal, for use as a common alarm. If
in the off condition. The positive input
straps 1 and 2 are connected together, the
may be applied from ALARM switch
+ 6 volts output from amplifier IN-10 in
1A1S6 (DISABLE position) or from
the receive input and carrier alarm
bistable FFB-1 (talk-request detection
module (+ 6 volts output immediately
module), when a talk-request signal has
upon loss of input carrier) is inverted by
been detected, signifying the order-wire
amplifier IN-6 and applied as a low level
circuit mode of operation (par 5-23).
(ground)
to
the
SYNCHRONIZER
DISABLE OUT output terminal, to disable
f. Common Alarm Circuitry.
any external synchronizing equipment that
requires output from the MD-674(P)/G to
maintain synchronism.
(1)
The common alarm circuitry in the input
interface and common alarm module
5-29
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