M17 Project

Author: Andreas Schmidberger, OE3ANC

  • LinHT Rev B – hardware testing status

    It took us some time, but here’s a quick update on where we’re at with the LinHT Rev B hardware tests:

    What‘s working?

    • Variable RF input attenuators
    • RF switch – switching between TX/RX paths
    • RF PA (Power Amplifier) – functional, delivering about 4.5 watts (CW)
    • GNSS connection – UART interface (NMEA)

    Still requires testing

    • GNSS receiver’s antenna path
    • PMU (Power Management Unit) – battery voltage measurements

    Known problems

    • Audio codec IC – reset and I²C communication issues needing a bit of investigation
    • The button below PTT not triggering USB boot sequence correctly
    (more…)

  • M17Web: Listen to M17 reflector traffic in your browser

    Why I built m17web

    When introducing my fellow Austrian hams to M17, I kept hearing the same question: “How does it sound?” This coincided with my desire to experiment with Rust and WebAssembly, creating the perfect opportunity to build a tool that would answer this question while expanding my programming skills.

    How it works

    m17web consists of three main components connecting to mrefd and working together to bring M17 digital voice to your browser. The system listens to UDP traffic from M17 reflectors, routes it through a proxy server, decodes the audio in the browser using WebAssembly, and presents it through a clean web interface—all without requiring any special hardware or software installation.

    (more…)