So I recently bought a cassette player because I haven't had one since I was like 13 but when it arrived I noticed it had settings for short wave which I thought was kinda weird but I just didn't notice it when I bought it anyway later that day when the sun went down I was out on my porch messing with it I mostly found Spanish radio broadcasts and one guy giving a late night sermon but then as I was slowly turning the knob I found something that was kinda gard to tune in to it took a little bit of delicacy to hear it clearly it was just this loud roar accompanied by a bunch of beeps and tones that would repeat also my player says it only has a range of 55 meters if anyone has any ideas on what it is I'd like to hear them I've never messed with short wave before so I have no clue