This is a screen shot of the Passive IM Analyzer software running in Engineering Mode
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The screen is split into two halves: the left half is the stimulus side where the high-power interfering signals are controlled; the right half shows the measured response of the intermodulation products generated within the Device Under Test. The default display for the Engineering mode is the Spectral Display, as shown. The intermodulation products fall within the communications receive band and interfere with valid uplink signals.