I’ve been monitoring that cyclic change I noted in a previous writing. There was what I think was a blimp of interference between 7-1 and 7-2 because when I inspected it across all frequencies there was a very wideband response.
What is interesting now is that the cyclic motion is slowly decreasing over time. It is perhaps getting more humid? I’m going to have to keep an eye on this interesting signal. It must have a basis in the physical world but exactly what I don’t know.