Ever wonder what all those funny sounds are that you come across from time to time on the ham bands? My daughter used to think it was Martians, but actually most of those strange noises are different types of digital transmissions.

Click the links below to hear what a particular mode sounds like.

Mode:

• AMTOR FEC
• APRS / Packet
• ASCII
• BPSK-31
• BPSK-63
• CCW (FSK)
• Chip
• Domino
• Feld-Hell
• FM Hell
• Hell 80
• MFSK 8
• MFSK 16
• MT63
• Olivia
• PACTOR 1 FEC
• PAX
• PSK-63F
• PSK-220F
• PSKFEC-31
• PSK-Hell
• QPSK-31
• RTTY
• SSTV
• Throb
• Throb X