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2. Terminal node controller - Wikipedia

   en.wikipedia.org/wiki/Terminal_node_controller

   A terminal node controller (TNC) 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 baseband digital signals to audio tones. [1]

3. Parallel Logic Radio Interface - Wikipedia

   en.wikipedia.org/wiki/Parallel_Logic_Radio_Interface

   The circuit shown below is the Deluxe PLRI interface, and is used to connect a radio to a PC using a parallel port and sound card. This circuit is fully compatible with the Version 3 IRLP board, and can be used in place of an IRLP board. This circuit allows negative or positive COS from the radio, and also supports negative or positive PTT keying.

4. Fldigi - Wikipedia

   en.wikipedia.org/wiki/Fldigi

   Fldigi (short for Fast light digital) [4] is a free and open-source program which allows an ordinary computer's sound card to be used as a simple two-way data modem.The software is mostly used by amateur radio operators who connect the microphone and headphone connections of an amateur radio SSB or FM transceiver to the computer's headphone and microphone connections, respectively.

5. List of software-defined radios - Wikipedia

   en.wikipedia.org/.../List_of_software-defined_radios

   Kit 7.5 MHz ext No 48 kHz 0/1 USB Yes Yes Yes SoftRock Lite II [113] Kit 1.891 – 1.795 MHz, 3.57 – 3.474 MHz, 7.104 – 7.008 MHz, 10.173 – 10.077 MHz, 14.095 – 13.999 MHz (also purchasable in other tunings) ext No 96 kHz 0/1 USB Yes Yes Yes SoftRock RX Ensemble II LF [114] Kit or Pre-built 180 kHz – 3.0 MHz ext No

6. Category:Digital amateur radio - Wikipedia

   en.wikipedia.org/wiki/Category:Digital_amateur_radio

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7. List of amateur radio software - Wikipedia

   en.wikipedia.org/wiki/List_of_amateur_radio_software

   MacLoggerDX is a full-featured amateur radio contact logger for macOS with Transceiver control, Rotor control, Callbook lookup, QSL handling (Hardcopy / LoTW / eQSL / Club Log), DX Cluster and spotting, and basic contesting support.

8. The Internet Archive is building a library of amateur radio ...

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9. M17 (amateur radio) - Wikipedia

   en.wikipedia.org/wiki/M17_(amateur_radio)

   The project received a grant from the Amateur Radio Digital Communications in 2021 [7] and 2022. [8] The protocol has been integrated into several hardware and software projects. [ citation needed ] In 2021, Kaczmarski received the ARRL Technical Innovation Award for developing an open-source digital radio communication protocol, leading to ...