ADX MINI

ADX MINI – Digital QRP HF SDR Transceiver Platform

The ADX MINI is a compact and efficient digital HF transceiver platform designed for amateur radio operators who want a simple, modular, and highly capable QRP radio system. Based on the ADX architecture, it is optimized for digital modes operation using PC-based software such as WSJT-X, making it ideal for modern SDR-style communication.

This system is built around a minimalist design philosophy, reducing complexity while maintaining strong real-world performance. The ADX MINI uses a CD2003 receiver front-end combined with a Class-E QRP transmitter stage, enabling reliable operation across multiple HF bands using interchangeable band-pass filter modules.

The design is intended to work seamlessly with a computer or Raspberry Pi via a simple USB interface, allowing full CAT control and audio integration through standard sound card connections.

The modular structure allows operators to switch bands easily by changing filter modules, supporting common amateur HF bands and enabling efficient multi-band operation.

Key Features

• Digital-only HF QRP transceiver design
• Based on ADX architecture by WB2CBA / Scott Baker variant
• PC-controlled operation using WSJT-X or similar software
• CD2003 receiver front-end
• Class-E QRP transmitter stage
• Modular plug-in band-pass filter system
• CAT control support (Kenwood TS2000 emulation style)
• Optimized for FT8, FT4, JS8, WSPR digital modes
• Simple construction and low-cost component design

Applications

• Amateur radio HF digital modes
• FT8 / FT4 / WSPR operation
• QRP experimental radio projects
• SDR-style PC-controlled transceivers
• Educational RF and communications projects