Monitored 87.9 Mhz some more today while driving. Sitting at the stop sign on 6th Ave and 205th St NE waiting for a chance to pull out in traffic and listing to noise when a strong signal emerged, remained for about three seconds, then rapidly was gone back to white noise again.
Then driving down I-5, just south of the University district, picked up a signal briefly.
All of these times it faded up very suddenly, stayed for a short duration, then faded out very rapidly.
Didn’t hear enough of it to determine what it was, one time sounded like religious music, another time sounded like Chinese music, but both times it only lasted a few seconds so not enough to really know what was going on.
It definitely was not cross-modulation, the signal was clean and only one program material. Also, at 6th, I was sitting still when the signal came up out of the noise, achieved full quieting, and then went back into the noise.
I was driving to where I have equipment co-located, traveling east bound on Highway 90, just past Mercer Island, just into Bellevue (Washington), monitoring 87.9 because I had picked up a pirate station in downtown Bellevue a week prior.
The station I had picked up in downtown was extremely weak, receivable for only a few blocks so it may even actually been legal (the radio in my car is very sensitive).
But this was something totally different. It rapidly faded in, in about 1-2 seconds, just east of Mercer Island, it was playing a Viagra commercial, it was rock solid from about the I-405 interchange to the East Gate exit, where it faded out equally fast as it had faded in.
There are only two legal stations on this frequency in the US, one is a whopping 10 watts at a high school in California, the other 28 watts at a church in Nevada.
When I came back from the co-lo facility, it was gone. Maybe something breaking through form a parallel dimension .. (Twilight Zone music)