- Thanks for the info Jan. Let s hope someone with the necessary skills can help out. Howard From: DVRPTR_V1@yahoogroups.com [mailto:DVRPTR_V1@yahoogroups.com]Message 1 of 6 , Dec 10, 2012View Source
Thanks for the info Jan. Let’s hope someone with the necessary skills can help out.
A year before I tried C4FM and played with a raised-cosine shaping filter...
For an C4FM, APCO P.25 phase I modem a really good demodulator (good clock recovery) is needed. I'm not good to develop signal-processing things, so I still renew my appeal to specialists to join developing here...
I will support, program and integrate an alternative P.25 firmware if some one will introduce me for necessary filters and algorithms...
Btw. I will happy about a well calculated clock recovery + filter solution for GMSK.