MIL-DTL-62481A(AT)
3.4.5 Audio interface. The control unit shall interface with a variety of audio accessories.
Primary interface details are shown in figure 2. When handsets are used with the control units,
they are connected to the control unit through J802 to allow radio transmission or to J803 to
allow intercom transmission. When headsets are used with the control unit, they are connected to
the control unit through J802 and J803 to allow both radio and intercom transmission.
Monitoring of the intercom and radio shall not be affected by connection to either J802 or J803.
The control unit shall interface with the distribution unit through either J801 or J804 to enable
radio and intercom functions.
3.5 Operating requirements. Each control unit shall provide the following functional,
operational, and performance capabilities.
3.5.1 Microphone amplifier.
3.5.1.1 Input impedance. The input impedance from pin D to pin A of J802 and J803
shall be 150 +23 ohms (Ω) at 1000 Hertz (Hz).
3.5.1.2 Microphone to radio gain. The voltage gain from pin D of J802 and J803 to pins
K, N, U and V of J801 and J804 shall be 110 +10 volts (V) per V at 1000 Hz.
3.5.1.3 Radio output impedance. The output impedance at pins K, N, U and V of
J801 and J804 shall be 1330 +133 Ω at 1000 Hz.
3.5.1.4 Microphone to radio frequency response. The microphone to radio frequency
response shall be flat +2 decibels (dB) from 500 Hz to 3000 Hz.
3.5.1.5 Microphone to radio distortion. With a 7 millivolt (mV) root mean square (rms)
1000 Hz signal applied to the microphone input of J802 or J803, and output taken at pins K, N, U
and V of J801 and J804, the total harmonic distortion shall be less than 2 percent (%).
3.5.1.6 Microphone to radio crosstalk. The voltage at any unselected output shall be at
least 50 dB below the output of the selected radio output.
3.5.2 Radio to headset.
3.5.2.1 Radio to headset gain. The voltage gain from pins J, M, T and S of J801 and
J804 to pin B or E at J802 shall be 140 +30 V per V with a 500 Ω load at pin B or E and a
frequency of 1000 Hz.
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