MIL-DTL-38449D
FIGURE 5. High frequency noise susceptibility test schematic.
4.4.6.3.3 Intercom loading. The output of an oscillator (600-ohm source impedance) shall be
adjusted for an open-circuit voltage of 0.7V rms (0 dBm). Terminated with the intercom (pins 9
and 12), output shall change by no more than 1 dB.
4.4.6.3.4 Push-to-talk function (class 4 only). With SW15 in the class 4 position, move SW14
to the (REC), (OFF), and (TRANS) positions. In each position confirm proper operation of the
audio section.
4.4.7 Environmental tests.
4.4.7.1 High temperature. This test shall be conducted in accordance with MIL-STD-810,
Method 501.1, procedure I except that, at the conclusion of the functional test at 71°C and with
the unit non-operating, the internal temperature of the chamber shall be raised from 71°C to
130°C and stabilized at 130°C. Upon conclusion of the 15-minute period, the temperature shall
be returned to room temperature and the unit shall be functionally tested in accordance with
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