Open-source digital controller for the uSDXn V1

modular 40m QRP transceiver.

The uSDXn V1 Controller PCB is the digital control section of the uSDXn V1 Modular QRP Transceiver, an open-source 40m QRP HF transceiver platform designed for experimentation, education, and amateur radio development.

The Controller PCB is based on an Arduino Nano / ATmega328P and provides the digital control and user interface functions of the transceiver, including frequency control, LCD display, rotary encoder, push buttons, PTT, CW key input, and communication with the Si5351 frequency synthesizer.

The Controller is designed as a separate modular PCB that interfaces with the uSDXn V1 Analog Core PCB. This modular architecture allows the digital and analog sections to be built, tested, modified, and developed independently.

The first hardware release uses through-hole components to make the project accessible to builders, experimenters, and students.

The complete hardware design, schematics, documentation, BOM files, and manufacturing files are available through the project GitHub repository.

Open Hardware License: CERN-OHL-P-2.0.

Project Resources

The complete project documentation, hardware files, firmware, and development information are available on GitHub:

https://github.com/wj6c/uSDXn

Community discussion, experimentation, troubleshooting, and project updates are available through the uSDX Community Facebook group:

https://www.facebook.com/groups/uSDXQrp