Current Status
TNCs were uniquely necessary when home computers lacked the sophistication needed to simultaneously manage a network connection and communicate with the user. They are still used today throughout a very popular position reporting network known as APRS on 144.390 MHz (in Europe 144.800 MHz)
Powerful desktop computers are commonplace in amateur radio stations. Software modems using the computer's soundcard have lowered hardware requirements even further. However, with their lower cost comes additional tweaking in order to make them work properly, and they often don't provide the decoding capabilities at low Signal/Noise ratios. Some handheld and mobile VHF radios currently on the market incorporate TNC abilities within the radio itself in support of the APRS protocol.
Many TNCs are still in use, especially in unattended stations where reliability is important. The importance of location to the APRS system has fueled development of a new generation of small low-power TNCs often integrated with a GPS module for use in mobile tracking stations.
APRS digipeating protocols require specific naming conventions, and older TNCs may not have the required support to be used as a digipeater. However, almost any TNC can be pressed into service for Home or Tracker use. TNCs that were clones of the popular TAPR TNC-2 may be upgradeable via the UIDIGI firmware project.
Read more about this topic: Terminal Node Controller
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