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>
Sent: Saturday, October 24, 2020 7:28 PM
To: 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, 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/ [1] 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/ [2]
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 <kanto...@gmail.com>
*Sent:* Saturday, October 24, 2020 3:27 PM
*To:* 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, 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>>
Sent: Saturday, October 24, 2020 12:52 AM
To: 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
Freetel-codec2@lists.sourceforge.net
<mailto:Freetel-codec2@lists.sourceforge.net>
https://lists.sourceforge.net/lists/listinfo/freetel-codec2 [3]
_______________________________________________
Freetel-codec2 mailing list
Freetel-codec2@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/freetel-codec2 [3]
_______________________________________________
Freetel-codec2 mailing list
Freetel-codec2@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/freetel-codec2 [3]
_______________________________________________
Freetel-codec2 mailing list
Freetel-codec2@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
