Unid MFSK (polytone) at 5369khz

[danixvideos]

Perhaps coquelet?

[boobtuber06]

this reminds me of A-school

[lucadepu]

this could be data bursts, wikipedia /wiki/Phase-shift_keying in phase shifting keying. they're easyily hearable

[JohnnyX50]

Hi buddy!, That is fascinating!! What on earth is going on there I wonder. What do the different frequencies represent? In a spectrograph there just small lines going up and down in a seemingly random order :)