Amateur radio digital modes

The following is a list of the modes of radio communication used in the amateur radio hobby. Amateurs use a variety of voice, text, image, and data communications modes over radio. Generally new modes can be tested in the amateur radio service, although national regulations may require disclosure of a new mode to permit radio licensing authorities to monitor the transmissions. Encryption , for example, is not generally permitted in the Amateur Radio service except for the special purpose of satellite vehicle control uplinks.
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Digital Modes

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Amateur Radio Digital Modes » Electronics Notes

Communication technologies that are specifically designed to improve "live" HF keyboard operation can now be achieved which were previously only theory, too complex, or too costly to implement to be practical. Thanks to the generosity of radio amateurs hams with programming knowledge, and to the Internet, new and powerful communications tools are available to all hams. The evolution and wide spread use of the Personal Computer that include a digital sound card for Digital Signal Processing DSP , is allowing radio amateurs to use these tools to develop new modes of digital communication. The distinguishing features of live HF digital operation today are the use of lower power, compact or indoor antennas and courteous operating techniques. This reverses the trend of several years ago.
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Amateur Radio WB8NUT

In a recent article , I lamented my distaste for carrying on the classic amateur radio conversation — calling CQ, having someone from far away or around the block call back, exchange call signs and signal reports and perhaps a few pleasantries. The difference between the two terms is mostly not important to our discussion, though, and in practice a lot of hams use the terms interchangeably. But for completeness, modulation is a way of impressing information on a radio wave, and a mode is a way of using a modulation to communicate.
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These digital modes provide a very interesting way in which to communicate over ham radio, offering different challenges to those presented by the more traditional modes of transmission. What can be thought of as the first of the family of digital modes was RTTY - radio teletype. Originally this used large and heavy mechanical teleprinters or teletypes. With the introduction of computers in the home, these teleprinters became redundant and it was possible to incorporate much greater levels of flexibility. This also saved a significant amount of space, a commodity often short in ham radio stations.
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