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|  MIL-R-23016(Wep)
audio frequency signal of 1 volt rms, open circuit, is
applied as shown in Figure 25. Measurements shall be made
over a frequency range of 50 to 15,000 cps.
Radio Frequency Radiated:
3.2.9.14.2
No malfunction or reduction of specified sensitivity shall
be produced when the equipment is subjected to a radio
frequency field. This field shall be established with a
50-ohm signal generator driving the antenna listed below.
Care shall be taken to use matching networks when required.
The test setup is shown in Figure 26 for the rod antenna
and is similar to Figures 11 and 12 for the other antennas,
with the signal source replacing the interference meter.
Open-circuit
Antenna
Microvolts
Frequency
41-inch rod
100,000
0.15 to 25 mc
35-mc dipole
25 to 40 mc 10,000 (3,000 for receiver bandpass)
Tuned dipole
100,000
40 to 1,000 mc
100,000
Same as used
1,000 to 10,000 DC
for radia-
tion test
Receiver Intermodulation:
3.2.9.14.3
The contractor shall test the intermodulation properties
of receiving type equipment by either of the two tests
following.
3.2.9.14.3.1
Two-Signal Intermodulation Test:
Receivers, preamplifiers, or antenna couplers shall not pro-
duce an output indication when two sine wave signals repre-
senting undesired signals are connected to the input terminals
of the test sample. The two frequencies shall be chosen so
that their sum or difference is equal to the test frequency
and so that neither will give an output when applied alone.
The magnitude of each shall be at least 70 db above 1 micro-
volt at the test sample terminal; one shall be modulated
30 percent with a 10,000-cycle signal, and other 30 percent
with 1400-cycle signal. Impedance matching networks shall
be used as required.
73
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