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(a)gmail.com <nanocask(a)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!