Boonton PIM 31 User Manual - Manual (Page 79)

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A visual example of intermodulation caused by two CW signals.
Ideally, test
frequencies f1 and f2 should be at the edge of the transmit guard bands, so that
the IM3 products f
IM3L
and f
IM3H
fall at the edge of the receive band(s), usually
utilized as guard bands. This minimizes interference within the system under test
and also eliminates potential interference in other wireless bands
IM3 serves as an example. With IM3 as a result of PIM, other IM products (IM5,
IM7, IM9, IM11, …) will be present as well, and can impact base station
performance significantly.