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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.
A fully open sourced drop-in replacement for the DL2MAN Sandwich
Si5351 based WSPR beacon
Band hopping WSPR beacon for Arduino and Si5351
PCB for the Ararinha 6 RF/Ham Radio project of PY2OHH with 3 bands.
Arduino controller for portable HF transceiver with an Si5351 oscillator, WSPR, memory channels, etc
A wspr transmitter/receiver using the QRP Labs arduino shield
A compact directional HF wattmeter for portable operation.
Python3, HTTP POST in python, working with image, csv files in Python
Source code of the ATSAMF QRP transceiver by Rick PA5NN