![]() Several software packages will be discussed to help you get started. Then, to decode the audio, it is only a matter of selecting the right software for the mode of interest. If yours does not, you can add an inexpensive USB sound card to do the job. What makes this setup work nicely is that most PCs have sound cards that can accept the audio signals from the radio. Block diagram of shortwave data receiver. Figure 2 shows how the pieces fit together.įIGURE 2. Then, the sound is analyzed using audio decoders in the PC software. That is, the radio signals are first converted to audio signals using your radio receiver. One of the things that all of these modes have in common is that they are audio modes. ![]() To convey images and graphics, commercial stations use radio-facsimile (FAX), while amateur stations use slow scan TV (SSTV) and EasyPal. Text messages are usually conveyed with these protocols. These modes - developed by amateur radio operators - use low power and complex coding, and allow communication over great distances. Some of the popular newer modes are Binary Phase Shift Keying (BPSK), Weak Signal Propagation Reporter (WSPR), and the weak signal digital modes JT65/9. Some are as simple as Morse code (CW) or Radio-teletype (RTTY), while others are more sophisticated such as AMTOR or SITOR which are similar to RTTY. In this article, I will show you how to use a low cost ($62) shortwave radio to get you started in this exciting hobby.ĭata transmissions vary in complexity and contain a wide variety of information. ![]() If you are connected to the Internet, your radio receptions can be reported to websites like, , and others where they will be displayed on a world map such as PSK Reporter as shown in the lead photo. As amazing as it seems, many of these data signals can be picked up and decoded at home using just a low cost shortwave receiver, your PC, and some specialized software. Digging a bit deeper, there is another world of shortwave radio that does not use conventional sounds.
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