This is a Frequency-Shift-Keying Demodulator to work with your shortwave receiver and computer. One end plugs into the Line Out (1/8" headphone jack) on any single-sideband receiver, and the other plugs into a serial port. The included software allows the demodulator to convert Morse Code into plain text automatically, and to decode over-the-air fax broadcasts. Software is DOS based. Package includes demodulator, software on 3.5" disks, and manuals.
$15, CONUS shipping included.