![]() The TNC was replaced by a simple, easy to build interface. Somewhere the light bulb went off that every PC contained an analog to digital (A/D) converter the sound card. Amateur Radio U/VHF Packet networks sprung up all over the world, a precursor to the internet. A common mode, called Packet radio quickly became popular as Packet TNCs became readily available at reasonable prices. Strange new words entered our vocabulary like AMTOR, Pactor G-TOR. In the early 80’s manufacturer’s began to create interfaces called Terminal Node Controllers ( TNC ) that connected the PC to a transceiver. A number of manufacturer’s sold interfaces, some quite costly. The interfaces evolved with the electronics into a simple circuit using a 555 chip to encode and 567 chip to decode. At first these were very complex circuits with discrete components. Home brew interfaces connected the teletype to amateur rigs. ![]() RTTY used large mechanical teletype machines to create and decipher Baudot encoded text. Early on in the years prior to the personal computer RTTY was the only available digital mode (besides CW). The rapid expansion of digital communications in amateur radio is all due to the increased computer capabilities and the software that has been developed to process the digital signals.
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