MIL-STD-469B APPENDIX A
60.5.4 Procedure. This test should be performed as a closed system test. A typical block diagram of the test setup is shown on figure 37. Disconnect the transmission line to the system antenna at the nearest available breakpoint external to the equipment enclosure. Terminate the transmission line on the receiver side of the disconnect point in an adapter as necessary to match the transmission line to the test receiver.
60.5.4.1 For each of the test frequencies as specified in table III, start at the low extreme of the frequency range as specified in table X and increase the test receiver frequency until a signal is detected. Tune the test receiver for maximum response and record the response level on the data sheet as shown on figure 38.
Connect the coaxial cable leading to the test receiver to a CW signal generator. Tune generator to obtain a frequency matching that of the reference analyzer response. Adjust the generator level to duplicate the reference response level. Record the generator frequency (measured with the frequency counter) and level readings. Continue the frequency scan until the next oscillator emission is found. Repeat entire procedure just described for each oscillator emission encountered in the frequency range as specified in table X.
60.5.5 Sample calculations. The results from receiver oscillator radiation measurements consist of signal generator CW substitution level and frequency and associated test data such as adapter loss. Sample oscillator radiation data forms are shown (see figures 38 and 39).
60.5.5.1 A sample calculation to obtain the receiver oscillator radiation level follows: Measured data:
Signal generator frequency: 1250.764 MHz
Signal generator level (P GEN): 38.0 dBm
Adaptor loss (A1) = 1.4 dB.
The oscillator radiation level (P CW) is calculated
PCW
= PGEN + A1
= 38.0 + 1.4
= 36.6 dBm.
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