MIL-C-81861(AS)
3.5.1.6.2 SNAKE Mode Input Signals. The equipment shall accept at pin J1-20
any voltage at or within the following levels:
Voltage
Mk 46 GYRO
0.576E to 0.624E
0
0.784E to 0.812E
STBD
35
E
STBD
70
0.185E to 0.216E
PORT
70
0.376E to 0.424E
PORT
35
The voltages are a function of voltage E supplied to pin J1-10.
3.5.1.6.3 SNAKE Mode Output Signal. For any combination of eqiupment Mk 46 GYRO
switch positions, the equipment shall be capable of provididng at pin J1-27 up to 2.5
amperes to an inductive load at a voltage 1.0 volt less than the input power supplied
to pin J1-10. The output voltage at pinJ1-27 shall be zero for all matches
combinations within 1.8 volts of each other.
HATS Mode. When the Mk 46 CEIL/Mk 44 FL switch is placed in the HATS
3.5.1.7
position, the gyro switch shall be energized.
3.5.1.7.1 The equipment shall provide a null circuit, and one (control or
reference) branch of a self balancing bridge network of which the second (controlled)
branch is part of the accessory equipment. The voltage provided to the bridge by the
control branch shall be manually selected and shall provide a voltage reference to
the null circuit for comparison with the HATS mode voltages provided by the accessory
equipment. The voltage provided to the bridge, by the controlled branch (of the
accessory equipment), will be selected by a rotary stepping switch. The equipment
shall provide a drive voltage to the stepping switch (of the accessory equipment)
whenever the HATS Mode voltage from the accessory equipment does not match (or equal)
the reference voltage selected.
3.5.1.7.2 HATS Mode Input Signals. The equipment shall accept at pin J1-20 any
voltage at or within the following levels:
Voltage
Mk 46 GYRO
0.576E to 0.624E
0
0.784E to 0.812E
STBD
35
E
STBD
70
0.266H to 0.307H
STBD
95
0.131H to 0.156H
120
STBD
O.404H to 0.453H
150
STBD
0.547Hto 0.596H
180
O.693H to 0.734H
PORT
150
H
PORT 120
0.844Hto 0.869H
PORT 95
0.185E to 0.216E
PORT 70
0.376E to 0.424E
PORT 35
The voltages are a function of voltage E supplied to pin J1-10 and voltage H (-24 ±
1.2 volts dc) supplied by the equipment.
9
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