Patent ID: 8593158

Claim:
An apparatus for measuring passive intermodulation (PIM) comprising: a signal sweep generator; a first signal source providing a signal with a first frequency F 1 , the first signal source connected to the signal sweep generator to provide an offset sweep signal on the frequency F 1 at the output of the first signal source; a second signal source providing a second signal with a second frequency F 2 ; and a first signal combiner having a first input connected to the first signal source, a second input connected to the second signal source and an output providing a signal combining the first signal and the second signal to provide an output with frequencies F 1 and F 2 to a test port that is connectable to a PIM source; a reflected signal passband filter connected to the test port, the reflected signal passband filter for providing a reflected signal of frequency 2F 1 -F 2 from the test port; a downconversion signal port for providing a signal frequency of approximately 2F 1 -F 2 ; and a second signal combiner having a first input receiving and combining the output of the reflected signal passband filter, a second output connected to the downconversion signal port and providing an output enabling analysis of the sweep signal to determine a distance to the PIM source.