Terminal Node Controller (TNC)
A terminal node controller is a device used by amateur radio operators to participate in AX.25 packet radio networks. It is similar in function to the Packet Assembler / Disassemblers used on X.25 networks, with the addition of a modem to convert base band digital signals to audio tones.
TNC's were necessary when home computers lacked the sophistication needed to simultaneously manage a network connection and and communicate with the user. Now, more powerful desktop or laptop computers are commonplace with amateur radio stations. Software modems using the computer's sound card have lowered hardware requirements even further. However, with their lower cost comes additional tweaking in order to make them work properly, and they often do not provide the decoding capabilities at low Signal / Noise rations. Some handheld and mobile VHF radios currently on the market incorporate TNC abilities within the radio itself in support of the APRS and other protocols
A digipeater is a station that does digital repeating. Unlike full-duplex VHF/UHF voice repeaters a digipeater will receive a packet of data, reprocess it, and retransmit on the same frequency. A digipeater which operates on multiple frequencies is called a gateway.
Partial List of Terminal Node Controller for Winlink Express
Byonics: Tiny Track4 - $75, $140 w/GPS
The TinyTrak series is one of the most popular on the raod. Small and purpose-built, the latest TinyTrak can double as a TNC for your Winlink or any other packet needs. It's also the cheapest digipeater solution that I know of. If it is hooked up to a compatible GPS, it can display the locations of other stations.
TNC-X (MFJ-1270X - $129.95
TNC has a optional USB interface, 1200 baud, KISS Mode, and is used with terminal software such as Pr4Win.
SignaLink USB or SignaLink RJ45 - HRO $104.95
Kantronics KPC-3+ Packet Communicator - HRO $199.95
As a single-port radio modem/TNC compatible with the
characteristics of UHF/VHF transmission bands, the KPC-3+ can be
paired with a UHF/VHF radio.
SCS P4dragon DR-7800 HF Modem (Farallon.us $1849)
Operating modes: PACTOR-4, 3, 2, 1, Weather-Fax (receive), GPS
Last Update: 09/12/2016 © Copyright Sumter County ARES. All Rights Reserved.