Pydemod is a set of Python 3 libraries and tools for demodulating radio signals. It does not intend to compete with full-featured packages such as GNU Radio. Instead, it strives to allow radio enthusiasts to gain hands-on experience with modulation schemes.

Pydemod relies on NumPy/SciPy.

Currently, the released modules include:

• physical layer:
  • phase demodulation (naïve)
  • Manchester decoding
  • basic logical levels (TTL-like) decoding and clock synchronization
• data link layer:
  • synchronization and error detection for polynomial codes
  • full implementation of RDS and AMSS codes
  • CRC calculation
• application layer:
  • functional AMSS decoder
  • functional temperature & humidity sensor decoder (supports protocols TX29 and Conrad) → see blog post (in French)
    • You can very easily receive signals using an RTL-SDR dongle, using a command like this: rtl_fm -M am -f 868.4M -s 160k - |./decode_weather.py --protocol tx29 --squelch 4000 --rawle -

Pydemod is licensed under the terms of the GNU GPL v3.

Pydemod is developed by Christophe Jacquet, F8FTK/HB9ITK.