MIL-P-83927B (USAF)
(2) Relay K3 shall close when an RMS voltage of not less than 11 volts
nor greater than 25 volts at the resonance frequency is applied between J1 -
K and J1 - H with J2 - P grounded.
(3) Relay K3 shall not pull in when an RMS voltage of less than 80_
volts at a frequency of 4000 Hz + 50 Hz is applied between J1 - K and J1 - H
with J2 - P grounded.
(4) The maximum voltage applied between J1 - T (+) and J1 - H with J2 -
P grounded necessary to activiat relay K3 shall be 18 volts DC.
(5) All of the above shall apply over the temperature range of -D650C
to + 100°C.
3.3.3.4 Audio Amplifier.
a. Audio Amplifier of Types PP-2401B/A, PP-4285/A and PP-4286/A.
(1) The amplifier shall operate class "A" push-pull, and shall be so
designed and constructed that a short circuit or open circuit across the
output will not damage the amplifier. Input impedance shall be a minimum of
20,000 ohms.
(2) Gain characteristics shall be:
Input-Volts RMS
Output-Volts RMS into
at 840 and 1200 Hz
600 - Ohms ± 1%, Non-Inductive Load
005
2.5 minimum
5
25 minimum
10 or greater
40 + 5
(3) The distortion at 5.5 VRMS input at 150, 840, and 2000 Hz shall not
exceed 15%.
(4) With a 12,000 ohm (l%) resistor across the input of the audio
amplifier, the random noise across a 600 ohm (1%) output load shall not
exceed 0.15 VRMS.
b.
Audio Amplifier of Type PS1037-3C.
(1) The amplifier shall operate class "A" push-pull, and shall be so
designed and constructed that a short circuit or open circuit across the
output will not damage the amplifier. Input impedance shall be a minimum of
20,000 ohms.
(2) Gain characteristics shall be:
Input-Volts RMS
Output-Volts RMS into
at 840 and 1200 Hz
10 Ohms ± 1%, Non-Inductive Load
0.5
0.32 minimum
5
3.2 minimum
10 or greater
4.5 to 6.0
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