MIL-PRF-62488A(AT)
3.4.6 Radio receive crosstalk. The output from any non-driven radio buffer shall be at
least 50 decibels (dB) below the output of a driven radio buffer channel (see 4.5.4.6).
3.4.7 Radio receive buffer output impedance. The output impedance between pins J, M,
T and S and pin A of J504, J505, J506 and J507 shall be 46 ohms + 10% each when measured at
1000 Hz (see 4.5.4.7).
3.4.8 Intercom accent control. The intercom accent control shall reduce the output of the
radio receive buffers 20 + 3 dB when activated (see 4.5.4.8).
3.4.9 Microphone buffer audio input impedance. The input impedance between pins K,
N, U and V and pin A of J504, J505, J506 and J507 shall be 68 ohms + 10% each, when
measured at 1000 Hz (see 4.5.4.9).
3.4.10 Microphone buffer gain. The voltage gain at 1000 Hz from pin K of J504, J505,
J506 and J507 to pin U of J501; pin N of J504, J505, J506 and J507 to pin U of J503; pin U of
J504, J505, J506 and J507 to pin U of J509; and pin V of J504, J505, J506 and J507 to pin U of
J511 shall be 11.86 + 0.8 V per V (see 4.5.4.10).
3.4.11 Microphone buffer frequency response. The microphone buffer frequency
response shall be flat + 2 dB from 300 to 3500 Hz (see 4.5.4.11).
3.4.12 Microphone buffer distortion. The microphone buffer shall perform as specified
with a 35 mV, 1000 Hz signal applied at the input. The output shall contain less than 2% thd
(see 4.5.4.12).
3.4.13 Microphone buffer crosstalk. The output from any non-driven microphone buffer
shall be at least 50 dB below the output of a driven microphone buffer (see 4.5.4.13).
3.4.14 Microphone buffer output impedance. The output impedance between pins U and
A of J501, J503, J509 and J511 shall be 150 ohms + 10% each when measured at 1000 Hz
(see 4.5.4.14).
3.4.15 Retransmit gain. With the retransmit switch on RETRANS, the voltage gain from
pin K of J501 to pin U of J503 and from pin K of J503 to pin U of J501 shall be 2.01 + 0.5 V per
V when measured at 1000 Hz (see 4.5.4.15).
3.4.16 Line amplifier input impedance. The input impedance at the line terminals when
measured at 1000 Hz shall be 600 ohms + 10% balanced, when in the LISTEN mode
(see 4.5.4.16).
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