MIL-DTL-9415B
TABLE VI. Harmonic distortion.
Output in dB (re: 1.0 volt)
Maximum Distortion (%)
0
2.0
1
2.0
2
2.0
3
2.5
4
3.0
5
3.5
6
4.0
7
6.0
8
12.0
3.5.1.4 Input-output characteristic (normal). The input-output characteristic shall be within the limits listed
3.5.2 Performance in call condition.
3.5.2.1 Gain (call). The bridging gain of the amplifier, measured at 1,000 Hz and below the overload point, shall
be 6.5 dB ± 1.5 dB (see 4.5.2.2.2).
3.5.2.2 Frequency response (call). The frequency response of the amplifier shall be within the limits specified in
3.5.2.3 Distortion (call). The total harmonic distortion present in the output voltage of the amplifier at 400 Hz shall
TABLE VII. Distortion.
Output dB (re: 1.0 volt)
Maximum Distortion (%)
0
2.0
1
2.0
2
2.0
3
2.5
4
3.0
5
3.5
6
4.0
7
6.0
8
12.0
3.5.3 Amplifier output with ON-OFF switch in OFF position. With the ON-OFF switch in the OFF position and the
call circuit of the amplifier unenergized, the output of the amplifier shall not exceed 0.0045 volt when fed with a 4.4
volt 1,000-Hz signal (see 4.5.2.2.6).
3.5.4 Noise in output due to ripple on dc line. The noise output of the amplifier in the normal condition, with 1.5 -
volt (rms) ripple of 400 Hz superimposed on the 27.5-volt dc power line, shall be less than 0.001 volt (see 4.5.2.2.7).
3.5.5 Phasing. The phasing shall be such that when the instantaneous voltage at terminal A of Connector J701,
as shown on figure 4, is positive with respect to that at terminal B, the instantaneous voltage measured at the output
terminal identified with a red dot shall be negative with respect to the other output terminal (see 4.5.2.2.8).
3.5.6 Microphonic noise. When subjected to the vibration test specified herein, the microphonic noise output of
the amplifier shall not exceed 0.003 volt (see 4.5.2.2.9).
3.5.7 Transformers. Transformers shall be in accordance with MIL-PRF-27.
3.5.8 Wiring of amplifier. The amplifier shall be wired as specified on figure 4. The hookup wire shall be AWG No.
22 (642.4 circular mils) in accordance with NEMA HP-3. The outer covering shall be PTFE (Polytetrafluoroethylene).
See figure 4 concerning color coding.
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