Jeez I thought more people knew
Jeez I thought more people knew…….
let me make it nice and simple for everyone who is trying to make it more complicated than it is. All natural radio sources, like pulsars, stars, planets, trees and people emit BROADBAND radio waves, meaning that they can be detected over a broad range of frequencies (let’s say 730-1150 AM all picked up the same station, that would be a broadband signal)
NARROWBAND signals do not come from any known natural source. That would be like your radio station, or walkie-talkie frequency, or cell phone transmission. As far as we know, narrowband signals can only be produced artifically. Therefore, any narrowband signal determined to be coming from anywhere not in our neighbourhood would be suspected to be evidence of extraterrestrial intelligence.