But it doesn't preclude the use of D-STAR. (and there is D-STAR data without voice) There's a number of efforts where the AMBE chip (a lot of state-of-art technology crammed into a little chip) is being used to decode and encode D-STAR signals in a manner completely consistent with the open source license. You just need to pass the digital data through the AMBE chip. And with the proper receiver modes, I see no reason why PowerSDR couldn't decode and encode the GMSK signal necessary.
Ed WA4YIH -----Original Message----- From: Tim Ellison [mailto:telli...@itsco.com] Sent: Monday, June 01, 2009 8:09 PM To: Woodrick, Ed; Jim Madden; flexradio@flex-radio.biz Subject: RE: [Flexradio] vhf/uhf digital modes and repeater operation OK, so proprietary was the wrong description. The original specification is in the public domain, developed by JARL as you noted. It specifies the AMBE 2020 codec. Apparently only one company has seen fit (or gone through the trouble) to develop a CODEC to fit the standard. The codec is *not* freely available. It must be licensed from DVSI as a 'black box' (either chips or pre-compiled binaries). This precludes putting it into a GPL application distribution as you have to distribute the source with any pre-compiled binaries. When there is an open source version of the AMBE 2020 codec, then there might be a chance it could be included in open source SDR software. -Tim -----Original Message----- From: Woodrick, Ed [mailto:ewoodr...@ed-com.com] Sent: Monday, June 01, 2009 7:50 PM To: Tim Ellison; Jim Madden; flexradio@flex-radio.biz Subject: RE: [Flexradio] vhf/uhf digital modes and repeater operation Correction - D-STAR is NOT Proprietary. It is an open standard developed by the JARL. -----Original Message----- From: flexradio-boun...@flex-radio.biz [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Tim Ellison Sent: Monday, June 01, 2009 11:08 AM To: Jim Madden; flexradio@flex-radio.biz Subject: Re: [Flexradio] vhf/uhf digital modes and repeater operation Yes, it will have tone support in an upcoming version of the software. D-Start is proprietary. You should be able to interface a TNC to the radio. I suspect that you can do it virtually too, but the AWG software will have to change to support separate sound card instances for TX and RX. -Tim -----Original Message----- From: flexradio-boun...@flex-radio.biz [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Jim Madden Sent: Monday, June 01, 2009 9:49 AM To: flexradio@flex-radio.biz Subject: [Flexradio] vhf/uhf digital modes and repeater operation I'd like to know if the forthcoming vhf/uhf add-on for the 5000 will support repeater operation and if so, how will pl tones be implemented. Also, are there thoughts about using the new add-on with the digital modes such as D-star, APRS, etc. Thanks very much Jim KD7GND _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/
