Digital Signal Processing (APCO 25)

(1) A link to a digital signal processing Software Defined Radio:

RTL-SDR Tutorial: Decoding Digital Voice (P25, DMR, NXDN, D-STAR) with DSDhttp://www.rtl-sdr.com/rtl-sdr-radio-scanner-tutorial-decoding-digital-voice-p25-with-dsd/

This seems to be mostly for SDR# fans, but I thought someone
might want to re-write it for the gnu radio project.

(2) I need simple minded tutorials for gnu radio just like the ones
I’m finding for the SDR# project. See:

http://sdrformariners.blogspot.co.nz/http://sdrformariners.blogspot.co.nz/