Here ya go Alan. See if this can answer some if your questions on that.
https://m17-protocol-specification.readthedocs.io/en/latest/ all the best.. Walter/K5WH From: Al Beard via Freetel-codec2 <freetel-codec2@lists.sourceforge.net> Sent: Sunday, October 25, 2020 3:27 PM To: freetel-codec2@lists.sourceforge.net Cc: Al Beard <bear...@unixservice.com.au> Subject: Re: [Freetel-codec2] Comments on the M17 project Hi all, What about the "connection" to HF? HF where we have bandwidth restrictions hence low bit-rate codecs. That's why I asked the question: In the M17 protocol, is there a "codec specifier" ? Many more questions but one is enough. Alan VK2ZIW On Sun, 25 Oct 2020 10:30:17 -0500, walterh wrote > Good to see you Gerhard.. > > I just heard last night that Doug should have his Dude Star application for > Android devices released maybe as early as today, that supports M17. Like it > does for all the other digital modes. > > I heard him using it last night and it sounded great. > > > Lots of great work happening in just the past week. > > Walter/K5WH > > > From: gerh...@oe3gbb.eu <mailto:gerh...@oe3gbb.eu> <gerh...@oe3gbb.eu > <mailto:gerh...@oe3gbb.eu> > > Sent: Sunday, October 25, 2020 2:33 AM > To: freetel-codec2@lists.sourceforge.net > <mailto:freetel-codec2@lists.sourceforge.net> > Subject: Re: [Freetel-codec2] Comments on the M17 project > > Hello Walter and all others, > Very interesting project. > I think a step in between could be to connect the M17-Client to a Gnu-Radio / > Adalm Pluto TRX setup and use MMDVM / M17. That would proove the audio > quality best. > I am goint to setup the M17-Client next days. Could also install a M17 > repeater at OE3XNK using LimeSDR or Pluto as soon some software is ready. > Regards > Gerhard OE3GBB > > > > Am 25.10.2020 02:24, schrieb walt...@k5wh.net <mailto:walt...@k5wh.net> : > > I honestly don't see how that claim could be made at this time, as there is > NO radio on the air at this point to demonstrate that. 😊 > > Perhaps it's a theoretical performance based on the current design, and it > would certainly be incredible to see that. > > Right now, we are ONLY using software on linux to connect to the backend > reflectors. > > So hopefully we will know about the true results when the guys get their > radios going in a week or two, as their components are still coming in from > vendors. > > Walter/K5WH > > -----Original Message----- > From: David Rowe <da...@rowetel.com <mailto:da...@rowetel.com> > > Sent: Saturday, October 24, 2020 7:28 PM > To: freetel-codec2@lists.sourceforge.net > <mailto:freetel-codec2@lists.sourceforge.net> > Subject: Re: [Freetel-codec2] Comments on the M17 project > > Thanks Walter. I was wondering about this statement on the M17 page: > > "M17 uses Codec2, written and developed by David Rowe. Codec2 outperforms > existing proprietary and patented (non-free) vocoders currently available." > > Do you (or others on this list) think Codec 2 at 3200 bits/ outperforms the > codecs used for DMR/DStar and friends? > > - David > > On 25/10/20 10:01 am, <mailto:walt...@k5wh.net> walt...@k5wh.net wrote: > > Here's a few notes I sent to someone else earlier today. > > > > > > > > > > > > M17 is a very NEW project with a great deal of traction just recently. > > > > > > > > <https://m17project.org/faq/> https://m17project.org/faq/ has some > > details about what is happening. > > > > > > > > This is a completely open source project using David Rowe's Codec2 for > > the encoding scheme. Much like the FreeDV for HF we have been using > > for many years. > > > > > > > > They have modified the back-end around Dstar for the reflectors and > > modules, using a very slightly modified version of the xlxd software > > for building reflectors. > > > > > > > > Seems that the reflector count has risen from 3 to 12 in the past 3 > > days, so the word is still getting out to others. > > <https://m17project.org/reflector/> https://m17project.org/reflector/ > > > > > > > > There is no commercially available radio, but the TR-9 is the radio > > that has been designed for it today. I understand they just got their > > alpha pc-boards barely a week ago, and are still sourcing the > > components for it. But there should be some RF available in a week or so. > > > > > > > > Jonathon Naylor has just updated the MMDVM code to support M17, and > > the hotspot devices and the gateway components are being worked next. > > His early comment below. > > > > > > > > Hi All > > > > I've just finished the first round of developing M17 support for the > > MMDVM. It is based on the current specification of M17, but it is a > > dynamic protocol so it may well change before long. I've raised some > > issue with the M17 developers which may mean changes to address those > > issues. > > > > Currently M17 won't work with MMDVM hotspots based on the chip > > modem/radio, only those systems based on MMDVM modem boards. In theory > > the levels are correct and you should be able to load the modem code, > > and the MMDVM Host from the M17 branch and off you go. I don't know if > > it works as I have no M17 radios. Once we get hotspot support for M17 > > then I think it'll be possible to use them as low powered M17 transceivers. > > > > On the networking side, it only connects to one M17 reflector, and > > that is set in the ini file. Currently it's set to M17-USA module A. > > If things move on with M17 then I will create a proper M17 Gateway > > program with echo functionality to allow for dynamic control of the > > reflector, but that is far off at the moment. > > > > I have tested my code against itself, and most of it seems to work, > > some corners have not been tested yet, but they will be in due course. > > > > If anyone has an M17 transceiver and wishes to play with the code, I'd > > be interested in what happens. > > > > Jonathan G4KLX > > > > > > > > > > > > > > > > > > > > > > > > > > > > So it is early in the development stages, but things are indeed moving > > fast, as of just the ast few weeks. > > > > > > > > > > > > > > > > Walter/K5WH > > > > > > > > *From:* Adrian Musceac < <mailto:kanto...@gmail.com> kanto...@gmail.com> > > *Sent:* Saturday, October 24, 2020 3:27 PM > > *To:* <mailto:freetel-codec2@lists.sourceforge.net> > > freetel-codec2@lists.sourceforge.net > > *Subject:* Re: [Freetel-codec2] Comments on the M17 project > > > > > > > > Hi Walter, > > > > Is there like a mailing list of the project or something? > > > > Adrian > > > > On October 24, 2020 4:13:56 PM UTC, <mailto:walt...@k5wh.net> > > walt...@k5wh.net > > < <mailto:walt...@k5wh.net> mailto:walt...@k5wh.net> wrote: > > > > Several of us have been working with M17 for the past week, using > > the Mvoice linux client, and it's working quite well with the > > reflectors they have in place today. > > > > > > > > The number of reflectors have increased from 3 early last week to 9 > > as of this morning, with a couple more that should show up today. > > > > > > > > Since it uses the Dstar concept for reflectors, each one can support > > modules A-Z, so 26 different sets of qso's if it ever gets that > > busy. 😊 > > > > > > > > I am greatly looking forward to seeing the TR-9 radio on the air > > before too long, to really exercise the mode, as the MMDVM and > > hotspot code gets updated by Jonathan. > > > > > > > > Once the gateway option is available, then cross-modes of DMR/Fusion > > etc.. to M17 should will ramp things up until more radios are > > available. > > > > > > > > It's really exciting for me to see yet another opportunity for > > David's Codec2 to truly shine for us. > > > > > > > > M17 is another great victory for the Open Source World! > > > > > > > > Walter/K5WH > > > > > > > > -----Original Message----- > > From: Al Beard <bear...@unixservice.com.au > > <mailto:bear...@unixservice.com.au%20%0b> > > < <mailto:bear...@unixservice.com.au> > > mailto:bear...@unixservice.com.au>> > > Sent: Saturday, October 24, 2020 12:52 AM > > To: <mailto:freetel-codec2@lists.sourceforge.net> > > freetel-codec2@lists.sourceforge.net > > < <mailto:freetel-codec2@lists.sourceforge.net> > > mailto:freetel-codec2@lists.sourceforge.net> > > Subject: [Freetel-codec2] Comments on the M17 project > > > > > > > > Hi all, > > > > > > > > I was looking at the M17 project and noticing their discussion on > > callsign sending. Suggesting in 48 bits for Src and Dest, packing > > the characters as RT11 filenames used to do. (Digital PDP-11 of > > 1975) > > > > > > > > What I notice in our HF mode 700D, it has quite poor data > > reliability particularly in the "Txt MSG" which is where the Src and > > Dest data may well be. > > > > > > > > Adding 96 bits to every frame is in my view way too many bits. > > > > In our current modes eg. 700D, could we sacrifice every tenth frame > > for source and destination? > > > > > > > > Thoughts? > > > > > > > > --------------------------------------------------- > > > > Alan VK2ZIW > > > > Before the Big Bang, God, Sela. > > > > OpenWebMail 2.53, nothing in the cloud. > > > > > > > > > > > > > > > > _______________________________________________ > > > > Freetel-codec2 mailing list > > > > <mailto:Freetel-codec2@lists.sourceforge.net> > > Freetel-codec2@lists.sourceforge.net > > < <mailto:Freetel-codec2@lists.sourceforge.net> > > mailto:Freetel-codec2@lists.sourceforge.net> > > > > <https://lists.sourceforge.net/lists/listinfo/freetel-codec2> > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > > > > > _______________________________________________ > > Freetel-codec2 mailing list > > <mailto:Freetel-codec2@lists.sourceforge.net> > > Freetel-codec2@lists.sourceforge.net > > <https://lists.sourceforge.net/lists/listinfo/freetel-codec2> > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > > _______________________________________________ > Freetel-codec2 mailing list > <mailto:Freetel-codec2@lists.sourceforge.net> > Freetel-codec2@lists.sourceforge.net > <https://lists.sourceforge.net/lists/listinfo/freetel-codec2> > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > _______________________________________________ > Freetel-codec2 mailing list > Freetel-codec2@lists.sourceforge.net > <mailto:Freetel-codec2@lists.sourceforge.net> > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 --------------------------------------------------- Alan VK2ZIW Before the Big Bang, God, Sela. OpenWebMail 2.53, nothing in the cloud.
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