What radio system makes a signal that looks like this?

802.11n/wifi

TV colorburst

Loran-C

ultra low frequency-submarines


Answer: Loran-C (100kHz)



The people who answered it right were:

Takashi T. Minyana
G4AXX
DL9KR
3Z6AEF
VE7RF
PA3DFR
dk8vs
KA8WFC

Thanks to everyone who gave it a try.