PhoenixNest M110A Modem
Professional HF Data Modem - Now Free & Open Source!
MIL-STD-188-110A implementation with direct SDR receive capability. No licenses, no restrictions - just download and go!
📡 NEW: Direct SDR Receive
The I/Q pipeline is validated and ready for real-world testing!
SDRplay RSP2 Pro → phoenix_sdr → .iqr file → IQSource → Demodulator (48 kHz)
🧪 Beta Testers Wanted!
Help us validate the SDR receive chain with real over-the-air signals.
What You Need:
- SDRplay RSP2 Pro (or compatible)
- Windows 10/11 PC
- Signal source (MSDMT, QTMSDMT, or live 110A signals)
Test Scenarios:
- Local loopback - MSDMT TX → audio → Phoenix Nest RX
- RF loopback - MSDMT TX → radio → SDR → Phoenix Nest RX
- Over-the-air - Capture real 110A signals from MARS nets
💰 Help Keep This Project Alive
This project is developed using AI-assisted coding tools. Here's what it actually costs:
| Category | Monthly | 3 Months |
|---|---|---|
| Claude Max | $100 | $300 |
| GitHub Copilot | $50 | $150 |
| API/Usage Costs | ~$75 | $225 |
| Total | ~$225/mo | $675+ |
Real talk: I run a firewood company. That's how we're paying for this - selling firewood. If you find this software useful, please consider supporting the project.
Contact to SupportDirect SDR Receive
Connect your SDRplay RSP2 Pro directly. No soundcard needed for receive!
SDR Info →Open Source
Full source code available on GitHub. Contribute, modify, and learn from the codebase.
GitHub →12 Waveform Modes
Full MIL-STD-188-110A implementation. 75 bps to 4800 bps with short and long interleave.
Learn More →🎉 Why Open Source?
We believe that reliable HF communications should be accessible to everyone. By open-sourcing the M110A Modem, we're empowering:
Study and improve HF communication protocols
Build custom solutions and integrations
Experiment with digital modes without barriers
Collaborate and contribute to the project