I did this quick video on YT -- called "FT-40 tones".
All up and down 10 meters (everywhere) I hear this tone that I don't have on any other band. It's midrange, maybe 1khz or so. Radio is on AM. I have no idea what this is. -- thanks for any help.
Thought it might be some sort of calibration tone or something but don't hear it on other bands and don't see any function on the radio for that.