DSTAR/P25 ham
DSTAR/P25 ham
are these two modes of operating the same exact thing? i am just getting into DSTAR and do not fully understand. can these be monitored on digital scanners?
Well they are both digital voice systems but they use different modulation (c4FM/CQPSK for P25 and GMSK? for DSTAR) etc and are totally incompatible. P25 was developed for Public Safety and can be monitored by a digital capable scanner. DSTAR was developed for amateur radio (by the Japanese ARL I think) and I'm not aware of any scanner (except perhaps the receivers made by icom???) that can decode DSTAR.
Chris - KB1NVI
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They are incompatible as stated above but an interesting side note is that the codecs for both are made and licensed to Digital Voice Systems Inc http://www.dvsinc.com in Westford MA. P25 or is a standard also called APCO project25 which had several codec manufacturers competing for a standard that then was approved by both APCO and the Federal government as their Phase1 standard. The same company designed a Codec standard for ICOM that is call D-STAR. Other manufacturers can use it but none do as of yet and probably none will ever at this point. Yaesu has already announced they plan to use their own standard a variant of TDMA. With Moto-Turbo, NexEdge, IDAS their are many digital formats out their and few are compatible. IDAS-NEXedge is the only exception I can think of.