MIL-PRF-62488A(AT)
3.4.1.2 Ripple. Upper and lower peaks of ripple voltage (see figure 3) shall each be less
than 2 V for combined generator-battery power supply and battery only power condition and 7 V
for generator only condition. The frequency components of the ripple shall be within the range of
50 Hertz (Hz) to 200 kilohertz (kHz).
3.4.1.3 Surges. All surges resulting from system operation shall fall within the loci shown
in figure 4 for combined generator-battery power supply and in figure 5 for generator only
condition. For battery only condition, any switching activity resulting in a surge which takes the
voltage outside steady-state limits will be considered as a fault condition for the duration of the
excursion.
3.4.1.4 Spikes. All spikes resulting from system operation shall fall within the loci shown
in figure 6 for combined generator-battery power supply and battery only condition and in figure 5
for generator only condition.
3.4.2 Radio receive audio input impedance. The input impedance between pins A and K
of J501, J503, J509 and J511 shall be 150 ohms + 15 percent (%) each when measured at
1000 Hz (see 4.5.4.2).
3.4.3 Radio receive gain. The gain from pins A and K of J501 to pin J of J504, J505,
J506 and J507 shall be 417 + 23 millivolts (mV) per V when measured at 1000 Hz. The gain
from pins A and K of J503 to pin M of J504, J505, J506 and J507; the gain from pins A and K of
J509 to pin T of J504, J505, J506 and J507; and the gain from pins A and K of J511 to pin S of
J504, J505, J506 and J507 shall also be 417 + 23 mV per V when measured at 1000 Hz
(see 4.5.4.3).
3.4.4 Radio receive frequency response. With a 0.22 V root mean square (rms) signal
applied at the frequencies listed below, the output voltage shall be as specified below
(see 4.5.4.4):
Frequency (Hz)
Output level (mV)
150
8+3
80.5 + 20
300
1000
91.7 + 5
97.9 + 2.2
3500
98.3 + 2.2
5000
3.4.5 Radio receive distortion. The radio receive buffer shall perform as specified with a
0.22 V rms input at pin K of J501, J503, J509 and J511 with less than 2% total harmonic
distortion (thd) when measured at 1000 Hz (see 4.5.4.5).
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