Hi TPKJ, in my network we have all technologies, GSM 900/1800, UMTS900/2100, LTE 800/2600/1800, but in this case I can ensure 100% that there wasnt any kinnd of intermodulation.
The intermodulation problems can be found very easy, the power in the another technology (interference) is increased and then the efect can be seen in the LTE (cell under interference). but here all was OK, in the FFT there was a big spike that was there for several days and suddenly it has gone.
the site was almost isolated, just covering a small village.
Many times we have interference form repeaters, but I can identify that signal, I have seen it many times, but this one was totally different, just a spike without any variations in the power.
We also have interference problems when the site is close to the train track but again we know the cause.
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