What Are Those Crazy Sounds On The lower End Of The Bands ? 

Samples of digital signals.  To play just double click the file.  To download right mouse click and select: Save Target As..

AMTOR_SAMPLE.WAV

BPSK31_SAMPLE.WAV

THROB_SAMPLE.WAV

HELLSCHREIBER_SAMPLE.WAV

RTTY_SAMPLE.WAV

MFSK_SAMPLE.WAV

MT63_SAMPLE.WAV

.

Click On The Below Links To View

West Mountain Radio

Sound Card Interfacing for RTTY, PSK31, and SSTV

Donner's Digital Interface Web Page

DigiPan Download Page

The Official PSK31 Web Site