I recorded two lavs and one boom to a Zoom F8 in a remote location. I didn't notice any audio problems when monitoring. On the files, including each iso, there is a 'warble'. It is on some of the tracks, and not others, though set up and location was the same during short interviews. I say this because i don't think the interference came from the microphones, i think it happened in the recorder? I would like to try and fix it, the spectrum analyzer shows deeper dropout from the 'warble' or 'modulated' tracks. I don't know how to research it because i'm not what happened or what to call it.
Linden Intermodulated Boom .mp3