MIL-DTL-52869C
e. The voltage across TB1-1 and TB1-2 shall be 5 ±0.5 Vdc with a
regulated voltage of 20 ±0.3 Vdc applied through a 24k ohm resistor to TB1-1
with TB2 grounded (see figure 1 of Appendix A) and with the microphone removed
and when the 20 ±0.5 Vdc is applied through an 18k ohm resistor with the
microphone installed.
3.5.2.6 Processor and processor CCA. The processor and processor CCA
shall be in accordance with top assemblies TA13220E3101 and TA13220E3111
respectively and have the following characteristics when 20 ±1 Vdc is applied
across TB1-7 (positive) and TB1-8 (negative), and the sensitivity control is
set to maximum, except as specified:
a. The input current shall not exceed 35 mA. When input polarity is
reversed (TB1-8 connected to positive power supply terminal), the input
current shall not exceed 1 mA. When the polarity is returned to its original
condition, the input current shall not exceed 35 mA. The voltage at TP5 shall
be 12 ±0.6 Vdc. When the input voltage is varied from 18 to 22 V, the voltage
at TP5 shall not vary more than ±100 mV.
b. With the sensitivity control set to maximum, a 25.5 kHz signal of
amplitude -75 ±3 decibels referred to one milliwatt (dBm) applied through a
0.1 microfarad coupling capacitor to TB2-1 and TB2-2 for 5 seconds shall cause
the processor to indicate the alarm state (more than 100k ohms across TB1-1
and TB1-2). When a 40-millisecond (ms) burst of a -75 ±3 dBm test signal is
applied every 4 seconds, the processor shall indicate the alarm state on the
fourth burst and remain in alarm for 0.5 to 1.5 seconds.
c. The response measured at TP2 shall differ not more than ±3 dB from
the average in-band response between 20 and 30 kHz. The response shall be
down at least 35 dB at 10 kHz and 20 dB at 40 kHz from the average in-band
response between 20 and 30 kHz.
d. The sensitivity control shall provide a sensitivity adjustment of at
least 24 dB.
e. The notch filter shall provide 36 dB attenuation of signal
frequencies that are within one percent of a sync frequency within the range
of 20 to 30 kHz applied to TB2-7. Attenuation of signal frequencies that are
not within 5 percent of the sync frequency shall be less than 3 dB.
f. When the alarm criteria in b. are met, the alarm circuit between
TB1-1 and TB1--2 shall remain open for not less than 0.5 seconds and not more
than 1.5 seconds.
g. The resistance across the alarm output terminals TB1-1 and TB1-2
shall be less than 150 ohms in the non-alarm state and more than 100k ohms in
the alarm state.
h. The resistance across tamper switch terminals TB1-5 and TB1-6 shall
be less than 10 ohms when the tamper switch is depressed and more than 100k
ohms when the tamper switch is released.
3.6 Electromagnetic susceptibility. The electromagnetic susceptibility
characteristics of the PUS shall conform to MIL-STD-461, methods RS103 and
CS101, as modified in 3.6.1 and 3.6.2.
3.6.1 Radiated. Radiated susceptibility shall be conducted in an electric
field of 3 volts per meter (V/m) for both steady-state and keyed conditions of
the EMI field generating equipment. This field applies to frequencies up to
500 megahertz (MHz). Above 500 MHz, the electric field shall be 1 V/m.
Maximum applied frequency shall be 10 gigahertz (GHz).
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