MIL-DTL-52869C
3.5.2.2.3 Sensitivity control range. The processor sensitivity control
shall provide a sensitivity adjustment of not less than 24 dB.
3.5.2.2.4 Notch filter characteristics. The notch filter shall provide 36
dB attenuation of signals having frequencies that are within one percent of a
sync frequency within the range 20 to 30 kHz applied to TB2-7 in the
processor. The attenuation of signals having frequencies that are not within
5 percent of the sync frequency shall be less than 3 dB.
3.5.2.3
Detailed circuit requirements.
3.5.2.3.1 Gain control range. The receiver gain control shall provide a
gain adjustment of at least 20 dB.
3.5.2.3.2 Alarm duration. When the alarm criteria are met (see
3.5.2.2.1), the PUS shall go into the alarm state for not less than 0.5
seconds nor more than 1.5 seconds.
3.5.2.3.3 Alarm output. The resistance across the processor alarm output
terminals (TB1-1 and TB1-2) shall be as follows:
a.
Non-alarm state: less than 150 ohms.
b.
Alarm state: more than 100 kilohms (k ohms).
The alarm output terminals shall be capable of accepting up to 10 mA dc in the
non-alarm state and up to 30 Vdc in the alarm state.
3.5.2.3.4 Power interruption. When power to the PUS is interrupted, or
the ground wire is disconnected, the PUS shall be in the alarm state.
3.5.2.4 Tamper protection. The resistance between terminals 5 and 6 of
the receiver and processor TB1 shall represent a tamper alarm condition by
exceeding 100k ohms, or a non-tamper condition by being less than 10 ohms.
The tamper alarm condition shall be presented whenever the cover is opened
from 0.062 to 0.250 inch (flanges engaged) and shall continue until the cover
is closed or the tamper switch actuator rod is pulled out. The switch shall
reset by closing the cover.
3.5.2.5 Receiver and receiver CCA. The receiver and receiver CCA shall be
in accordance with top assemblies TA13220E3151 and TA13220E3163 respectively
and have the characteristics stated below. Unless otherwise specified, the
microphone shall be removed, all input and output signals shall be sinusoidal,
the sensitivity control shall be set to position 5, and 5 ±0.5 Vdc shall be
present across TB1-1 (positive) and TB1-2 (ground) when performing the
measurements.
a.
The input current shall be less than 1 mA dc.
b. With a 25 kHz input signal applied across terminals 3 and 1 for the
microphone (that is, the solder pads on the CCA from which microphone leads 3
and 1 were removed) at an amplitude adjusted to produce an output of 50
millivolts (mV) peak-to-peak (P-P) across TB1-1 and TB1-2, the output shall
not vary more than ±5 mV P-P when the frequency is varied from 20 kHz to 30
kHz.
c. With a 22 kHz signal applied to terminals 3 and 1 for the microphone,
the signal level at TB1-1 shall decrease by at least 20 dB when the receiver
gain control is decreased from position 10 to position 1.
d. With the microphone installed on the receiver CCA, and an ultrasonic
transmit transducer on-axis one foot from the microphone, providing a sound
pressure level (SPL) at the microphone 75 dB above RSPL (0.0002 microbars) at
a frequency of 25 kHz, the signal at TB1-1 shall be 20 ±8 mV root-mean-square
(rms) when tested at room temperature (75 ±5 °F).
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