Hi Folks, No it isn't 'true'. The codec used is the one defined by the D-STAR spec. It is the DVSI AMBE codec and is, I am told, the same as that used in P25 systems. There are several non-Icom projects, like the DVDongle and the several 'non icom' repeater stacks running today. With NO Icom gear at all, no Icom intellectual property infringement. A non-Icom homebrew transceiver has been built and tested. It has been widely reported, but is not a 'useable' radio. It was a 'wonder if we could' project. The only Icom specific parts are the things like the message field that is simply where Icom chose to put some data into the defined packet. Anyone who wants to can make a D-Star radio that would compete and coexist with the Icom gear. I strongly suspect it is simply a matter of perceived market size. If it proves big enough others will jump in. 73 Ted W1GRI
_____ From: [email protected] [mailto:[email protected]] On Behalf Of john_ke5c Sent: Wednesday, March 17, 2010 13:47 To: [email protected] Subject: [DSTAR_DIGITAL] Re: Alternative D-STAR Equipment (Was: Looking for DSTAR MAP) > Chris Fowler wrote: > > > Has ICOM extended the spec so that Yaesu can not make a compliant radio? Yes, the codec is locked down but I don't see what would prevent Alinco from making a HT that can talk to an ICOM repeater. > > > John D. Hays wrote: > Anyone can make a D-STAR air protocol compliant radio. If it does the air protocol correctly it should work just fine with both Icom repeaters and the other hardware and software approaches mentioned up thread. True, but perhaps those who could manufacture "D-STAR compliant" (or perhaps just "DVAR") radios aren't motivated to do so if they can't compete in and affect characteristics of the infrasturcture market - repeaters, controllers, etc.? It's still not an open mode like the others - AM, CW, SSB, FM, PSK, etc. 73--John
