Yes, please ref.  https://gitea.osmocom.org/op25/op25/src/branch/master/op25/gr-op25_repeater/...

The code is currently released as experimental-only, YMMV.  It should, however , properly decode an H-CPM signal (under the proper conditions).  See the commentary for further details.

Max

On Wednesday, January 3, 2024, 8:15:26 PM EST, nanocask@gmail.com nanocask@gmail.com wrote:

Happy New Year!

Has anyone worked on demodulating H-CPM?

This is the modulation used by the SU when transmitting in an APCO P25 Phase II system.

Thanks Osmocom for all the pioneering SDR work you have done!