The early text mode digital radio communication like RTTY, AMTOR, and PACTOR were all first generation digi-modes. Check out my article on Digital Radio Fundamentals for more on the basics and the generation classification of various digital radio modes.Īmateur radio digital communication modes – Past & present Then came PSK31 followed by countless other protocols that have changed the world of digital radio forever.
Though PACTOR was far better in this regard but due to its proprietary nature, it never became as popular as one might have expected. The aggressive ARQ handshaking between the TX and RX was a nightmare resulting in frequent failure of T/R switching relays in the transceiver. Although they were good for duplex communication channels, they performed rather unsatisfactorily on a simplex radio system. The earlier ARQ (automatic repeat request) based modes like SITOR, AMTOR, and PACTOR which had at one time taken the world by storm fell out of favor pretty fast. The evolution of digital radio modes has gone through various generational changes over the decades. Whereas, with the advent of advanced technologies and computer algorithms and with the passage of time, several digital modes that came into being at one time often fell by the side only to be replaced by better modes with better protocols. However, even though there has been rapid evolution that brought in scores of new, more reliable, efficient, and robust protocols, RTTY still remains firmly entrenched to date. This was a straightforward and very basic mode that used binary FSK over a narrow baseband and was essentially an extension of cable teletype. The earliest text mode digital radio communication protocol that was used for effective long-distance radio communication of text messages was Radio-Teletype (RTTY). Radio amateurs have been in the forefront of the process of experimentation, development, and validation of workability and reliability of many of the digital communication modes that are in vogue today.
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Data and Text mode digital radio communication has matured over the decades and now forms an important aspect not only of professional and commercial radio but is also an integral part of amateur radio.
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