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

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, nanoc...@gmail.com 
<nanoc...@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!
  

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