Transform your smartphone into a full-fledged two-way radio with KV4P HT! Imagine being able to communicate even when mobile networks are down—all you need is your Android phone and a small, super cheap module (about $35) that turns your device into a portable VHF radio. No bulky radios, no hassle, just your phone and this open-source wonder.

Created by Vance Vagell (callsign KV4P), this project is as fun as it is functional. Simply plug the module into your phone’s USB-C port, launch the app, and your phone is now a radio. You can easily access your memory channels, scan frequencies, and even send and receive text messages using the AX.25 protocol, all without needing a cellular connection.

And the best part? This little gadget isn’t just about receiving transmissions. You can send and receive text messages completely off-grid, and the app even sends notifications for incoming messages—just like regular texts. The app allows you to scan through frequencies, add your own memories, and adjust settings to your liking. It’s all incredibly intuitive.

The KV4P HT even comes with some neat features like sticky push-to-talk for easier use, accessibility options like live captions, and squelch controls for better audio clarity. If you’re into tinkering with electronics, 3D printing, or just getting into the world of ham radio, this project is perfect for you. Plus, it’s so cheap, you’ll have enough left to buy that overpriced latte! Interested in building your own? Here’s a step-by-step guide! You can also follow the instruction right here.

[Via Korben.info (French)]