Decode UKHASnet packets with a RTL SDR dongle

This is a simple UKHASnet decoder for RTL SDR dongles. Other similar decoder might already exist but this was a way for me to understand the protocol and get used to it.

You need to have a working dongle and rtl_fm running.

Before starting

rtl_test

rtl_test -p 10 to get ppm error or use kalibrate but it did not work for me on OSX.

Get started

make

./UKHASnet-decoder -h

TODO (see code for details)

• Synchronisation:
  • Add tolerance bit option (and possibly use the preamble for more robustness)
  • Support inverted bits
• Confirm that RFM CRC computation is weird (has someone had some experience with that ?)
• Find better threshold formula to account for packet with no sufficient bit transitions