I have seen this signal many times before and I think it has been on the forum a while back. But my memory is a short thing these days so I don't remember when. What is it??? (over the horizon, maybe) Al, N4AB
It looks a lot like the trash generated by the under counter halogen lights in my kitchen. Two ways it can generate RF Hash: 1) the wall wart power supply is trashy. 2) Sometimes one of the bulbs can develop a micro crack in the filament. It doesn't keep it from burning, but it has a permanent arc that becomes a great spark gap transmitter.
It also looks similar to the trash generated by my neighbor's charge converter whenever he would plug in his camping trailer in preparation for the weekend camping retreat.
But those are only two of the options........others include: Plasma TV, defective "invisible fence," pool heater/pump, solar charger, and much more.
Part 15 devices should be regulated more effectively than they are right now. RF Pollution is rampant.