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

Band hopping WSPR beacon for Arduino and Si5351

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

Si5351 based WSPR beacon

All HF bands QRP CW transceiver

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

Modular learning system for radio electronics

BITX40 sketch for Raduino, Pavel's blend.

QRP CW Transceiver

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

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

A wspr transmitter/receiver using the QRP Labs arduino shield

DC QRP CW transceiver

Portable QRP CW Transceiver

Dynamic_Playback source code, including Preprocess

ESP32 CYD HAM Clock for the field

Source of the SODA POP rig

M9OMS VLDO V2 — very low dropout (LDO) linear voltage regulator for QRP. RF-quiet 9/12/13.8 V, 2 A, for QRP radios. No switching noise.

A compact directional HF wattmeter for portable operation.