This is a simple CW beacon project based on Arduino and Si5351 clock generator. It transmits a predefined message as morse code on a fixed frequency.

Multiband QRP CW TRX based on the QCX

A fully open sourced drop-in replacement for the DL2MAN Sandwich

Si5351 based WSPR beacon

Band hopping WSPR beacon for Arduino and Si5351

.NET Standard library for encoding/decoding messages using the WSPR protocol

All HF bands QRP CW transceiver

BITX40 sketch for Raduino, Pavel's blend.

PCB for the Ararinha 6 RF/Ham Radio project of PY2OHH with 3 bands.

Modular learning system for radio electronics

Arduino controller for portable HF transceiver with an Si5351 oscillator, WSPR, memory channels, etc

QRP CW Transceiver

Dynamic_Playback source code, including Preprocess

A wspr transmitter/receiver using the QRP Labs arduino shield

Portable QRP CW Transceiver

A portable companion for Ham Radio QRP

DC QRP CW transceiver

Source of the SODA POP rig

A compact directional HF wattmeter for portable operation.

High Pass Filter for QRP