At HADARS, we love a good hands-on challenge, and this year’s HADARS Buildathon 2025 is now underway!

Our club “Buildathon” project will have members assembling the Kanga Kits Little Roo – a simple yet effective 40m direct-conversion receiver that’s perfect for both newcomers and seasoned builders.  To kick off the build, Max, G4SDX, delivered a presentation covering the circuit’s design, functionality, and what makes this kit a great entry into homebrew radio construction. He explained the principles behind the receiver, including how it demodulates signals and how the local oscillator plays a key role in its operation.

For those who couldn’t attend – or want to revisit the details – we recorded Max’s talk, and it’s now available as part of HADARS SPARK!. Whether you’re soldering along at home or just curious about the project, this is a fantastic opportunity to get hands-on with radio construction.

As the Buildathon progresses, we’ll be sharing updates, troubleshooting tips, and (hopefully) success stories as members bring their Little Roos to life.

Check back after each build session for updates/photo’s/more downloads …

📡 Watch the full talk below –>

Are you taking part in the Buildathon?  Let us know how your build is going using the feedback form.