PIM Explorer

Conveniently locate Irritating PIM Sources from 600 to 2700 MHz

Cell Sites are naturally rich with joints of different metals, and at some conditions these passive junctions behave as non-linear devices, hence generating what’s called InterModulation. Any 2 signals can hit such elements and generate IM products which interfere with another co-existing channel at the same site or nearby. Hence, passive intermodulation is a critical issue in cellular networks and despite its relatively small level, it has serious effects if not mitigated.

In general, sources of PIM can be loose cables, corroded connectors, poor performance duplexers, aged/damaged antennas or can be rusty metals that exist beyond the Antenna. The later which is known as “Rusty Bolts” can be caused by elements in the near field of the antenna (few centimeters behind, above, below or
beside the antenna) or metal objects several meters away but still significantly illuminated by the antenna.