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WsprryPi 2.x – A Modern WSPR Beacon Using Only a Raspberry Pi

WsprryPi is an open-source project that transforms a Raspberry Pi into a standalone WSPR (Weak Signal Propagation Reporter) beacon. With no need for additional radio hardware, it offers an affordable and elegant way for amateur radio operators to experiment with low-power HF propagation.

The project recently reached version 2.1.1, bringing major improvements under the hood and ongoing support for current and upcoming Raspberry Pi hardware.

🔍 What is WSPR?

WSPR (pronounced “whisper”) is a digital radio mode designed for weak signal communication. It was developed by Joe Taylor, K1JT, to test propagation paths over long distances using very low power. WSPR beacons transmit signals containing location and callsign data that are automatically reported to a central network of receiving stations.

The WSPR network allows operators to see in near real-time how far their signal is being received—ideal for antenna testing and propagation studies.

🛠️ What is WsprryPi?

WsprryPi is a software package that enables a Raspberry Pi to transmit WSPR signals directly from its GPIO pins—no external transmitter needed. Originally based on PiFM, the concept was expanded and modernized by several contributors. The latest versions (2.x and beyond) are completely rewritten, no longer tied to the legacy codebase, and released under the MIT License for broader adoption.

Project page: https://github.com/lbussy/WsprryPi
Documentation: https://wsprdocs.aa0nt.net

🌟 Key Features

Full WSPR transmitter: Works standalone with Raspberry Pi GPIO
No SDR or external hardware required
Supports multiple WSPR bands (via harmonic filtering)
Raspberry Pi 4 and 5 support
Lightweight and efficient
Easy installation with a one-liner script
curl -L install wspr.aa0nt.net | sudo bash

🆕 What’s New in Version 2.x?

Rewritten core codebase for better performance and maintainability
Improved timing accuracy, especially in the WSPR transmission loop
Enhanced systemd integration for auto-start and reliability
Future-ready support for modern Raspberry Pi OS and hardware
More modular, extensible design

The development shift toward a modernized structure means it’s easier to maintain, easier to contribute to, and more robust in handling real-world scenarios.

⚠️ Things to Keep in Mind

WSPR transmission through GPIO may produce harmonics. Filtering is essential to ensure spectral cleanliness and regulatory compliance.
A low-pass filter or bandpass filter should be used before connecting the GPIO output to an antenna.
Only licensed amateur radio operators should use WsprryPi for over-the-air transmissions.

✅ Conclusion

WsprryPi continues to be a great tool for experimentation, learning, and passive beaconing. Whether you’re testing a new antenna, studying propagation, or simply interested in digital modes, it’s a low-cost project that packs a lot of value. The Raspberry Pi—already a favorite among radio experimenters—becomes even more versatile with WsprryPi installed.

If you want to give it a try, check out the GitHub repo or the official docs to get started. It’s a perfect example of how modern software and open hardware can empower amateur radio in smart, efficient ways.