MIL-PRF-49118B(CR)
70 dB point is reached, there shall be no returns above 70 dB.
b. SSB, CW and FSK
Bandwidth 6 dB points
2.8 KHz minimum
Bandwidth 26 dB points
4.0 KHz maximum
Bandwidth 60 dB points
6.0 KHz maximum
c. AM
Bandwidth 6 dB points
6 KHz minimum
Bandwidth 60 dB points
14 KHz maximum
3.5.3 Automatic gain control (receiver). The automatic gain control (AGC) shall maintain
the audio output to within 0 dB to +6 dB when the signal to the receiver is reduced from
100 microvolts to the referenced sensitivity level (see 3.5.1). The AGC shall not change more
than 3 dB when the signal to the receiver is increased from 100 microvolts to 0.150 volt. The
AGC attack time shall be 20 milliseconds -10, +15 milliseconds. The discharge time constants
shall be 1.5 seconds, ± 0.5 seconds for SSB operation and 0.75 seconds, ± 0.25 seconds for AM,
FSK and CW operation.
3.5.4 Squelch control (receiver). The squelch control shall operate with a received signal
producing a 4 dB to 10 dB signal-plus-noise to noise ratio at the audio output of the receiver.
The attack time for AM, SSB and FM operation shall be no more than 110 milliseconds and the
decay time shall be 800 milliseconds minimum and 3000 milliseconds maximum.
3.5.5 Audio output power (Receiver). The receiver shall deliver a minimum of
10 milliwatts of audio power at 1000 Hz into a 500 ohm ±20 percent resistive load for a received
signal-plus-noise to noise ratio of 10 dB or better in all modes of operation (see 4.5.5).
3.5.6 Audio distortion (Receiver). The total harmonic distortion of the receiver with
10 milliwatts output in the SSB and AM modes shall not exceed 5 percent at any audio frequency
between 500 to 3000 Hz for RF signals up to 0.150 volt. Between 0.151 and 0.200 volts the
distortion shall not exceed 10 percent in the SSB mode. In the FM mode, the total harmonic
distortion of the receiver shall not exceed 7 percent when receiving signals deviated ±8 KHz and
15 percent when receiving signals deviated ±12 for KHz for RF signals up to 0.3 volt (see 4.5.6).
3.5.7 Audio frequency response (Receiver). The audio frequency response of the receiver
from antenna input to audio output shall be as follows:
500 to 3000Hz
Peak to valley ratio less than or equal to 4 dB
300 Hz
At least 6 dB below 1000 Hz reference
250 HZ
At least 10 dB below 1000 Hz reference
5
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