ADX - Arduino Digital Modes Transceiver UPDATE (08 April 2023):

• ADX Build Manual V1.4 Released.

• Calibration Procedure Changed to protect EEPROM from R/W wear out during calibration. (20 December 2023)

• Caution Note on SI5351 Library.

• ZENER DIODE PA MOSFET PROTECTION to protect PA Mosfets from excessive SWR conditions.(20 December 2023)

• ADX_CAT_V1.2 Firmware release with CAT Control Functionality added.(07 April 2023)

• ADX_CAT_V1.3 Firmware with ADX FSK TX code.(08 April 2023) In some ADX rigs improved FSK TX code creates TX stream interruptions. Use firmware version whichever works on your rig.

• SI5351 Module pull up resistor fix update added to Build Manual V1.4 (08 April 2023)

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.

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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, 15m and 10m bands and can operate on four of the most popular digital modes, FT8, FT4, JS8call and WSPR.

• ADX now supports CAT via emulating KENWOOD TS2000 HF Transceiver with 115200 bps,8,1 Serial comm. CAT controls Band and Mode changes.

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!

• Plug in a USB cable between ADX Arduino and your PC, Select Kenwood TS2000 with 115200bps,8,1 setup as your CAT rig and you will have CAT control on ADX!

• 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