Stephen Cass details in IEEE Spectrum how to bring teletext back to life, that visual information system from the 80s, for use in amateur radio. The proposal is simple: connect a computer sound card to a radio rig. It generates digital tones that modulate the signal, allowing text pages and images to be transmitted and decoded. It's a direct bridge between retro aesthetics and the flexibility of modern hardware.
How to hack the airwaves with digital tones and open-source software 📡
The technical process is based on converting teletext page data into an encoded audio signal. The sound card emits these tones, which are injected into the microphone of an amateur radio. On the other end, another ham radio operator receives the signal and sends it to their PC. A program decodes the tones and reconstructs the page on screen. No specialized hardware is needed, just a computer with audio input and output, and the right software.
When your vintage radio asks for a sound upgrade 🎛️
The fun part is that while the world races towards 5G and fiber optics, a group of people is striving to make an 80s system work with a sound card they probably bought to play DOOM. The charm lies in seeing a ham radio operator seriously explain how their retro text transmission is more reliable than a WhatsApp message in a low-coverage area. Ironies of progress.