Total posts : 45366
I have had a problem here with my ramsey fm25b that tends to be over the top when it comes to treble, ive heard distortion on a cheap Durabrand boombox that made the sound almost the way you described yours. I moved the radio farther away from the transmitter and some of it cleared up, the rest of the noise was artifacts from the fm25b.
As i said the 25b has in my opinion too much treble and not enough bass or almost no bass. I think i found the solution or fix for the 25b’s lack of bass response. But anyways, i went out to my pontiac transport wich has a factory am/fm cassette radio, the noise was non-existant out there wich led me to believe the receivers in the house are just getting slammed with rf.
Did you hear the noise you mentioned on a radio that may be further away?
Im just guessing here, the above solutions maybe a better fix than mine. Good Luck