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ADX - Arduino Digital Modes HF Transceiver

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IMPORTANT NOTE ON NT7S SI5351 LIBRARY VERSIONS

Please install SI5351 Library that is in ADX Github under ADX Firmware! Or use Etherkit SI5351 Library Version 2.1.3. ADX firmware is compatible with only Etherkit SI5351 Library version 2.1.3.


ADX is an Arduino based Digital Modes Transceiver.

  • ADX - is abbreviation for Arduino Digital Xceiver.

  • ADX is a mono band (actually quad band) digital modes optimized HF transceiver that can cover four pre-programmed bands one band at a time by swapping Band LPF Modules. It can work on 80m, 40m, 30m,20m, 17m and 15m bands and can operate on four of the most popular digital modes, FT8, FT4, JS8call and WSPR. No 12m and 10m bands as it stretches RX IC CD2003GP to it’s limits as it is designed for AM band reception. Well I can’t complain for a 30 cents receiver IC!

My goal with this project is to design a simple HF Transceiver optimized for operating on Digital modes:

  • Simple to procure – meaning not effected by chip shortage

  • Simple to build – 2 modules, 2 IC’s and 4 Mosfets!

  • Simple to setup and tune – One simple calibration procedure is all needed.

  • Simple to operate – Plug in ADX MIC to soundcard MIC input and ADX SPK to PC soundcard speaker input and we are good to go with any digital modes Software.

  • Dirt Cheap – Costs less than 25$ to get all parts and PCB if we exclude ridiculous shipping costs!

  • For ease of following which parts to solder while building Main board of ADX, Interactive BOM File - ibom_ADX.html file is a great help. Just run that file on Microsoft edge and follow each highlighted component and solder one by one. This interactive BOM was prepared by Gilles DELPECH - F1BFU. Thank you Gilles!

If you like my designs and would like to support my work: https://www.buymeacoffee.com/wb2cba

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