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A bigger issue is RM-11831 would also ban DMR, P25, and pretty much every digital mode used on VHF as well, because of its open source requirement - currently e
by Aloha 7y ago
A bigger issue is RM-11831 would also ban DMR, P25, and pretty much every digital mode used on VHF as well, because of its open source requirement - currently every ham digital audio mode uses codecs from DVSI.
- nullc 7y agoProprietary patent encumbered digital modes have done a lot to ham string ham radio: They have resulted in a proliferation of mutually incompatible radios and repeater systems which otherwise could be totally compatible just with a different setting or firmware load. In addition to that most obvious annoyance, encumbered modes have restricted experimentation and exploration. Compare the vibrancy and progress in the open source HF low bandwidth modes implemented by WSJT to the level of technical development at the modem or codec level for dstar. FWIW, my recollection is that the AMBE patents are soon due to expire, if they haven't already.
- Aloha 7y agoBoth P25 and DMR are open standards, the only closed part is IMBE (which I believe is patent free now) and AMBE+2 (which will be patent free in the next 5 years). DSTAR is also a open standard too, but I think only has a single implementer, same for C4FM.