MIL-PRF-49118B(CR)
3.5 Performance characteristics.
3.5.1 Sensitivity (Receiver). The receiver shall meet the following sensitivity requirements
on any frequency within the specified ranges. All sensitivity measurements shall be made at an
audio output power of ten (10) milliwatts and the signal generator shall be connected to the 50-
ohm BNC connector on the front panel. Service condition limits shall apply to all tests
performed in receive only mode.
3.5.1.1 FM. The signal-plus-noise-plus-distortion to noise-plus-distortion ratio shall be at
least 10 dB when an RF signal of 0.6 microvolt, modulated with 1000 Hz, ± 8 KHz, deviation is
applied to the receiver on any frequency in the 30.0000 to 75.9999 MHz range. At temperatures
greater than 100o F and below 0o F, the signal-plus-noise-plus-distortion to noise-plus-distortion
ratio shall be at least 10 dB when an RF signal of 0.8 microvolts modulated as above is applied to
the receiver in the 30.0000 to 75.9999 MHz range.*
3.5.1.2 SSB, FSK and CW. The signal-plus-noise-plus-distortion to noise-plus-distortion
0 ratio shall be at least 10 dB when an RF signal of 0.45 microvolts in the 2.0000 to 75.9999
MHz range is applied to the receiver. At ambient temperatures greater than 100° F and below
0°F, the signal-plus-noise-plus-distortion to noise-plus-distortion ratio shall be at least 10dB with
an RF signal of 0.5uv applied to the receiver over the entire frequency range. In all cases, the
frequency of the RF signal shall be such that the recovered audio is 1000 Hz.*
3.5.1.3 AM. The signal-plus-noise-plus-distortion to noise-plus-distortion ratio shall be at
least 10 dB when an RF signal of 2.5 microvolts in the 2.000 to 19.9999 MHz range and 1.95
microvolts in the 20.000 to 75.9999 MHz range is applied to the receiver. At temperatures
greater than 100° F and below 0° F, the signal-plus-noise-plus-distortion to noise-plus-distortion
ratio shall be at least 10 dB when an RF signal of 2.5 microvolts is applied to the receiver over
the entire frequency range. The RF signal in all cases shall be 30 percent modulated by a
1000 Hz tone. If necessary, at temperatures above 100° F and below 0° F, the percent of
modulation may be increased up to a maximum of 80% to obtain the necessary audio output level
to attain these measured service condition limits.
*NOTE: Service condition limits.
3.5.2 IF selectivity (Receiver). The bandwidth in the respective modes of operation shall
be as follows:
a. FM
Bandwidth 6 dB points
32 KHz minimum
Bandwidth 60 dB points
70 KHz maximum
Within a 50 KHz range beyond the 60 point on both sides of the response curve, there shall
be no returns above the 60 dB response. Ultimate attenuation is 70 dB minimum. Once the
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