TM 5-6350-255-13
which determine the address of the particular unit.
where the 18-bit code is generated. The input level
detection and filtering are made to distinguish between
e. The code plug settings are achieved by selection
seismic disturbances caused by men and equipment,
of pin placements on the code plug module. These
and those caused by false alarm sources such as rain,
settings include the 6 bits of address; 1 bit of parity; 1 pin
tree root movement from wind and other natural ground
for fast or slow rate; 1 pin for high, medium, or low gain;
vibration.
and 1 pin for the complementary form of the
1-11. Differences Between Models
identification.
The major differences between Model AN/GSQ-154 (V),
and model AN/GSQ-1M4A (V), are the CID
f. The power supply is a 28-volt mercury cell
(complementary identification) which is set into 0 for
battery, providing an expected life of greater than 30
normal identification coding or 1 position for the
days for the MINISID III unit.
complementary identification code, when required for
ancillary equipment identification. Refer to Table 52 for
g. The add-on unit interface logic provides an
ID to CID conversion on Model AN/GSQ-154A (V).
appropriate set of signals for external control of the
1-12. Tabulated Data
MINISID III unit by any add-on unit.
Physical Characteristics:
Size .................. 7.3" Ig. by 7.4" wide by 3.0" high
h. Disable Functions. In addition to the normal
(19.0420 cm Ig. by 19.0960 cm wide by
operating functions, there are functions which cause the
7.6200 cm high)
Volume ............. 162 cu. inches (2655.2000 cm)
Weight .............. 8 lbs. (3.60 kg) (assembled)
i. An attempt to turn the unit from ARM to test or
Operational Characteristics:
off without placing the security switches to their properly
Transmitting power ............ 2w (minimum)
coded positions.
Transmitting frequen-.162 to 174 Mhz (on cy
range channels assigned channels) Transmission
j. An attempt to remove the end caps.
characteristics .................. Digital fsk
Power ............................... Battery, 28 volt, Mercury
k. Lowering
of
the
battery
voltages
to
Provisions are built in for add-on devices.
approximately 19 volts.
Built in self disable and tamper-proof circuitry (except for
units stenciled TEST and TRAINING)
I. When the caps are removed while the unit is in
Resettable code plug
the armed condition, a small magnet releases a reed
30-day minimum life on internal battery power
relay causing the disable pulse. A threshhold circuit
Field replaceable battery
monitors the nominal 28-volt battery and when the
Recoverable for reuse
voltage is reduced to approximately 19 volts, the circuit
Transmitter module
initiates a disable pulse.
Encoder module
Battery
1-9. Recovery and Reuse Circuits are contained in the
Seismic module
MINISID III that allow for safe recovery of the armed unit.
Interrupt/control assembly
By proper use of controls on the unit, the MINISID III is
prevented from disabling the transmitter. After recovery,
MINISID III may reused.
1-10. Seismic Module The seismic module is a self-
contained assembly that receives the low level signals
generated by the geophone. The seismic module
produces a six volt, 15 millisecond pulse when the signal
received from the geophone exceeds approximately 35
microvolts and is between 10 and 45 Hertz. With
continued seismic activity, a pulse will be produced every
10 seconds. The 15 millisecond pulse is sent to the
encoder module
1-6