freetel-codec2 — sub 5 kbit/s open source voice codec

[Freetel-codec2] FreeDV 2.0.1 released

[Mooneer S. <mo...@gm...>]

Hi all,

FreeDV 2.0.1 has been released, containing bugfixes for issues discovered
after the release of version 2.0.0. It can be downloaded using the
following links:

Windows:
https://github.com/drowe67/freedv-gui/releases/download/v2.0.1/FreeDV-2.0.1-windows-x86_64.exe
macOS:
https://github.com/drowe67/freedv-gui/releases/download/v2.0.1/FreeDV.dmg
Linux AppImage (Ubuntu 22.04+, Fedora 42):
https://github.com/drowe67/freedv-gui/releases/download/v2.0.1/FreeDV-2.0.1-x86_64.AppImage

More information about this release can be found on the GitHub release
page: https://github.com/drowe67/freedv-gui/releases/tag/v2.0.1

Thanks,

-Mooneer K6AQ

[Freetel-codec2] [Announcement] FreeDV Activity Day - July 19-20, 2025

[Mooneer S. <mo...@gm...>]

Hi all,

This is a reminder that this month's FreeDV Activity Day is this coming
weekend. (As a reminder, Activity Day takes place on the third weekend of
every month.) This event will bring together people interested in HF
digital voice on the air for conversation and fun. Contacts using the
official application as well as ezDV, the SM1000 handheld microphone and
other supporting devices and applications are welcome.

*Event time:* 12AM Pacific time (0700Z) on July 19 to 11:59PM on July 20
(0659Z on July 21) (48 hours).

*Suggested frequencies:*
160 meters: 1.997 MHz
80 meters: 3.625, 3.643, 3.693, 3.697 MHz or 3.803 MHz
60 meters (in countries where allowed): 5.4035 MHz or 5.3665 MHz
40 meters: 7.177 MHz or 7.197 MHz
20 meters: 14.236 MHz or 14.240 MHz
17 meters: 18.118 MHz
15 meters: 21.313 MHz
12 meters: 24.933 MHz
10 meters: 28.330 or 28.720 MHz
10 GHz (for those in range of QO-100): 10489.640 MHz

(Note that LSB/DIGL is used below 10MHz as per current convention for voice
modes, USB/DIGU otherwise. 60 meters is of course USB/DIGU only.)

As this isn't a contest, there's no pressure to make contacts or send logs,
but you can always confirm QSOs via the usual means if you'd like (LoTW,
eQSL, QRZ, etc.) Enabling reporting (PSK Reporter and FreeDV Reporter) in
the FreeDV application and joining FreeDV Reporter and Discord are
recommended, however, so others can see that you're on the air and hearing
them (for instance, here's the current map of listeners). :D

Feel free to spread this far and wide among your local ham friends and
groups! :) Let me know if you have any questions about the event and
definitely post here if you have issues getting the application working
prior to the event.

Thanks,

-Mooneer K6AQ

[Freetel-codec2] Field Day tomorrow

[Mooneer S. <mo...@gm...>]

Hi all,

As you may be aware, the annual ARRL Field Day event is this weekend. This
makes the usual HF bands used for FreeDV extremely busy, which makes
contacts using it more difficult. I'd like to remind people (especially
since we've gotten a lot of new users recently) that FreeDV also has
calling frequencies on the WARC bands:

17 meters: 18.118 MHz
12 meters: 24.933 MHz

These two frequencies are useful as contest operation (including Field Day,
even though it's technically not a contest) is typically not allowed on
WARC bands. Additionally, in my experience, 17 meter propagation is
typically similar to 20 meter propagation as well. If you give the WARC
bands a try this weekend, let us know how it went!

Thanks,

-Mooneer K6AQ

Re: [Freetel-codec2] [Announcement] FreeDV Activity Day - June 21-22, 2025

[Mooneer S. <mo...@gm...>]

Correction: 3.850 MHz in the below list should be 3.803 MHz. This will be
corrected in subsequent announcements. The latest frequency list can always
be found on FreeDV Reporter ("Calling Frequencies" tab at
https://qso.freedv.org/).

-Mooneer K6AQ

On Fri, Jun 20, 2025 at 2:02 PM Mooneer Salem <mo...@gm...> wrote:

> Hi all,
>
> This is a reminder that this month's FreeDV Activity Day is this coming
> weekend. (As a reminder, Activity Day takes place on the third weekend of
> every month.) This event will bring together people interested in HF
> digital voice on the air for conversation and fun. Contacts using the
> official application as well as ezDV, the SM1000 handheld microphone and
> other supporting devices and applications are welcome.
>
> *Event time:* 12AM Pacific time (0700Z) on June 21 to 11:59PM on June 22
> (0659Z on June 23) (48 hours).
>
> *Suggested frequencies:*
> 160 meters: 1.997 MHz
> 80 meters: 3.625, 3.643, 3.693, 3.697 MHz or 3.850 MHz
> 60 meters (in countries where allowed): 5.4035 MHz or 5.3665 MHz
> 40 meters: 7.177 MHz or 7.197 MHz
> 20 meters: 14.236 MHz or 14.240 MHz
> 17 meters: 18.118 MHz
> 15 meters: 21.313 MHz
> 12 meters: 24.933 MHz
> 10 meters: 28.330 or 28.720 MHz
> 10 GHz (for those in range of QO-100): 10489.640 MHz
>
> (Note that LSB/DIGL is used below 10MHz as per current convention for
> voice modes, USB/DIGU otherwise. 60 meters is of course USB/DIGU only.)
>
> As this isn't a contest, there's no pressure to make contacts or send
> logs, but you can always confirm QSOs via the usual means if you'd like
> (LoTW, eQSL, QRZ, etc.) Enabling reporting (PSK Reporter
> and FreeDV Reporter) in the FreeDV application and joining FreeDV Reporter
> and Discord are recommended, however, so others can see that you're on the
> air and hearing them (for instance, here's the current map of listeners). :D
>
> Feel free to spread this far and wide among your local ham friends and
> groups! :) Let me know if you have any questions about the event and
> definitely post here if you have issues getting the application working
> prior to the event.
>
> Thanks,
>
> -Mooneer K6AQ
>

[Freetel-codec2] [Announcement] FreeDV Activity Day - June 21-22, 2025

[Mooneer S. <mo...@gm...>]

Hi all,

This is a reminder that this month's FreeDV Activity Day is this coming
weekend. (As a reminder, Activity Day takes place on the third weekend of
every month.) This event will bring together people interested in HF
digital voice on the air for conversation and fun. Contacts using the
official application as well as ezDV, the SM1000 handheld microphone and
other supporting devices and applications are welcome.

*Event time:* 12AM Pacific time (0700Z) on June 21 to 11:59PM on June 22
(0659Z on June 23) (48 hours).

*Suggested frequencies:*
160 meters: 1.997 MHz
80 meters: 3.625, 3.643, 3.693, 3.697 MHz or 3.850 MHz
60 meters (in countries where allowed): 5.4035 MHz or 5.3665 MHz
40 meters: 7.177 MHz or 7.197 MHz
20 meters: 14.236 MHz or 14.240 MHz
17 meters: 18.118 MHz
15 meters: 21.313 MHz
12 meters: 24.933 MHz
10 meters: 28.330 or 28.720 MHz
10 GHz (for those in range of QO-100): 10489.640 MHz

(Note that LSB/DIGL is used below 10MHz as per current convention for voice
modes, USB/DIGU otherwise. 60 meters is of course USB/DIGU only.)

As this isn't a contest, there's no pressure to make contacts or send logs,
but you can always confirm QSOs via the usual means if you'd like (LoTW,
eQSL, QRZ, etc.) Enabling reporting (PSK Reporter and FreeDV Reporter) in
the FreeDV application and joining FreeDV Reporter and Discord are
recommended, however, so others can see that you're on the air and hearing
them (for instance, here's the current map of listeners). :D

Feel free to spread this far and wide among your local ham friends and
groups! :) Let me know if you have any questions about the event and
definitely post here if you have issues getting the application working
prior to the event.

Thanks,

-Mooneer K6AQ

Re: [Freetel-codec2] [digitalvoice] FreeDV 2.0.0 released

[Mooneer S. <mo...@gm...>]

Hi Steve,

Currently we recommend use of Barry G4MKT's build script for
compilation/installation on Linux:
https://github.com/barjac/freedv-rade-build. This should work fine on a
Raspberry Pi 5 AFAIK but if not, please submit a GitHub issue to his repo.

Thanks,

-Mooneer K6AQ

On Wed, Jun 4, 2025 at 10:12 AM Steve Stroh <ste...@gm...> wrote:

> Will this version be released for use on a Raspberry Pi 5 as was demo’d at
> Hamvention 2025?
>
> Steve N8GNJ
>
> Steve Stroh (he / him / his)
> ste...@gm...
>
> For Amateur Radio / Zero Retries / Conference:
> *Steve Stroh N8GNJ*
> Editor
> *Zero Retries Newsletter*
> st...@ze... <//st...@ze...>
> https://www.zeroretries.org
> *Zero Retries Digital Conference 2025*
> https://www.zeroretries.org/p/conference
> Radios are Computers - With Antennas!
>
>
>
> On Tue, Jun 3, 2025 at 18:58 Mooneer Salem <mo...@gm...> wrote:
>
>> Hi all,
>>
>> FreeDV 2.0.0 has been released, containing the first official release of
>> the RADE V1 mode previously trialled over several preview releases. Radio
>> Autoencoder (RADE) technology is a new approach to sending speech over HF
>> radio. It combines Machine Learning (ML) with classical DSP to send high
>> quality speech over HF radio at SNRs as low as -2dB in a bandwidth of 1500
>> Hz. More information about Radio Autoencoder can be found at
>> https://freedv.org/radio-autoencoder/.
>>
>> As part of this effort, deprecated modes (700C, 800XA, 2020 and 2020B)
>> have been removed from the application. Additionally, this contains
>> numerous bug fixes and non-RADE specific enhancements from the last
>> official release (1.9.9.2).
>>
>> It can be downloaded using the following links:
>>
>> Windows:
>> https://github.com/drowe67/freedv-gui/releases/download/v2.0.0/FreeDV-2.0.0-windows-x86_64.exe
>> macOS:
>> https://github.com/drowe67/freedv-gui/releases/download/v2.0.0/FreeDV.dmg
>>
>> More information about this release, including changelog, can be found on
>> GitHub release page:
>> https://github.com/drowe67/freedv-gui/releases/tag/v2.0.0
>>
>> Thanks,
>>
>> -Mooneer K6AQ
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "digitalvoice" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to dig...@go....
>> To view this discussion visit
>> https://groups.google.com/d/msgid/digitalvoice/CAAzDfxPFVxO3B172pUZO9OrTfhP%3DZ%2B%3DvJSPCudhBKpZ7arUcOw%40mail.gmail.com
>> <https://groups.google.com/d/msgid/digitalvoice/CAAzDfxPFVxO3B172pUZO9OrTfhP%3DZ%2B%3DvJSPCudhBKpZ7arUcOw%40mail.gmail.com?utm_medium=email&utm_source=footer>
>> .
>>
> --
> You received this message because you are subscribed to the Google Groups
> "digitalvoice" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to dig...@go....
> To view this discussion visit
> https://groups.google.com/d/msgid/digitalvoice/CAGh1Bg4dnf2XXFXqC0xg1js3bSYY%3DAf%3Dk-Roa-3p8ihi6K%2BJWw%40mail.gmail.com
> <https://groups.google.com/d/msgid/digitalvoice/CAGh1Bg4dnf2XXFXqC0xg1js3bSYY%3DAf%3Dk-Roa-3p8ihi6K%2BJWw%40mail.gmail.com?utm_medium=email&utm_source=footer>
> .
>

Re: [Freetel-codec2] FreeDV 2.0.0 released

[<gar...@ya...>]

Hi all, 
  
  
  
  FreeDV 2.0.0 has been released, containing the first official release of 
the RADE V1 mode previously trialled over several preview releases. Radio 
Autoencoder (RADE) technology is a new approach to sending speech over HF 
radio. It combines Machine Learning (ML) with classical DSP to send high 
quality speech over HF radio at SNRs as low as -2dB in a bandwidth of 1500 
Hz. More information about Radio Autoencoder can be found at  
https://freedv.org/radio-autoencoder/ . 
  
  As part of this effort, deprecated modes (700C, 800XA, 2020 and 2020B) 
have been removed from the application. Additionally, this contains 
numerous bug fixes and non-RADE specific enhancements from the last 
official release (1.9.9.2). 
  
  It can be downloaded using the following links: 
  
  Windows:  
https://github.com/drowe67/freedv-gui/releases/download/v2.0.0/FreeDV-2.0.0-windows-x86_64.exe 
  
macOS:  
https://github.com/drowe67/freedv-gui/releases/download/v2.0.0/FreeDV.dmg 
  
  More information about this release, including changelog, can be found on 
GitHub release page:  
https://github.com/drowe67/freedv-gui/releases/tag/v2.0.0 
  
  
  
  
  
  Thanks, 
  
  
  
  
  -Mooneer K6AQ 
  
  
  
  
  Hi all, 
  
  
  
  FreeDV 2.0.0 has been released, containing the first official release of 
the RADE V1 mode previously trialled over several preview releases. Radio 
Autoencoder (RADE) technology is a new approach to sending speech over HF 
radio. It combines Machine Learning (ML) with classical DSP to send high 
quality speech over HF radio at SNRs as low as -2dB in a bandwidth of 1500 
Hz. More information about Radio Autoencoder can be found at  
https://freedv.org/radio-autoencoder/ . 
  
  As part of this effort, deprecated modes (700C, 800XA, 2020 and 2020B) 
have been removed from the application. Additionally, this contains 
numerous bug fixes and non-RADE specific enhancements from the last 
official release (1.9.9.2). 
  
  It can be downloaded using the following links: 
  
  Windows:  
https://github.com/drowe67/freedv-gui/releases/download/v2.0.0/FreeDV-2.0.0-windows-x86_64.exe 
  
macOS:  
https://github.com/drowe67/freedv-gui/releases/download/v2.0.0/FreeDV.dmg 
  
  More information about this release, including changelog, can be found on 
GitHub release page:  
https://github.com/drowe67/freedv-gui/releases/tag/v2.0.0 
  
  
  
  
  
  Thanks, 
  
  
  
  
  -Mooneer K6AQ 
  
  
  
  
  Hi all, 
  
  
  
  FreeDV 2.0.0 has been released, containing the first official release of 
the RADE V1 mode previously trialled over several preview releases. Radio 
Autoencoder (RADE) technology is a new approach to sending speech over HF 
radio. It combines Machine Learning (ML) with classical DSP to send high 
quality speech over HF radio at SNRs as low as -2dB in a bandwidth of 1500 
Hz. More information about Radio Autoencoder can be found at  
https://freedv.org/radio-autoencoder/ . 
  
  As part of this effort, deprecated modes (700C, 800XA, 2020 and 2020B) 
have been removed from the application. Additionally, this contains 
numerous bug fixes and non-RADE specific enhancements from the last 
official release (1.9.9.2). 
  
  It can be downloaded using the following links: 
  
  Windows:  
https://github.com/drowe67/freedv-gui/releases/download/v2.0.0/FreeDV-2.0.0-windows-x86_64.exe 
  
macOS:  
https://github.com/drowe67/freedv-gui/releases/download/v2.0.0/FreeDV.dmg 
  
  More information about this release, including changelog, can be found on 
GitHub release page:  
https://github.com/drowe67/freedv-gui/releases/tag/v2.0.0 
  
  
  
  
  
  Thanks, 
  
  
  
  
  -Mooneer K6AQ

[Freetel-codec2] FreeDV 2.0.0 released

[Mooneer S. <mo...@gm...>]

Hi all,

FreeDV 2.0.0 has been released, containing the first official release of
the RADE V1 mode previously trialled over several preview releases. Radio
Autoencoder (RADE) technology is a new approach to sending speech over HF
radio. It combines Machine Learning (ML) with classical DSP to send high
quality speech over HF radio at SNRs as low as -2dB in a bandwidth of 1500
Hz. More information about Radio Autoencoder can be found at
https://freedv.org/radio-autoencoder/.

As part of this effort, deprecated modes (700C, 800XA, 2020 and 2020B) have
been removed from the application. Additionally, this contains numerous bug
fixes and non-RADE specific enhancements from the last official release
(1.9.9.2).

It can be downloaded using the following links:

Windows:
https://github.com/drowe67/freedv-gui/releases/download/v2.0.0/FreeDV-2.0.0-windows-x86_64.exe
macOS:
https://github.com/drowe67/freedv-gui/releases/download/v2.0.0/FreeDV.dmg

More information about this release, including changelog, can be found on
GitHub release page:
https://github.com/drowe67/freedv-gui/releases/tag/v2.0.0

Thanks,

-Mooneer K6AQ

[Freetel-codec2] [Announcement] FreeDV Activity Day - May 17-18, 2025

[Mooneer S. <mo...@gm...>]

(Sorry for the delay in sending this out, I'm currently at Dayton and have
been pretty busy.)

Hi all,

This is a reminder that this month's FreeDV Activity Day is this coming
weekend. (As a reminder, Activity Day takes place on the third weekend of
every month.) This event will bring together people interested in HF
digital voice on the air for conversation and fun. Contacts using the
official application as well as ezDV, the SM1000 handheld microphone and
other supporting devices and applications are welcome.

*Event time:* 12AM Pacific time (0700Z) on May 17 to 11:59PM on May 18
(0659Z on May 19) (48 hours).

*Suggested frequencies:*
160 meters: 1.997 MHz
80 meters: 3.625, 3.643, 3.693, 3.697 MHz or 3.850 MHz
60 meters (in countries where allowed): 5.4035 MHz or 5.3665 MHz
40 meters: 7.177 MHz or 7.197 MHz
20 meters: 14.236 MHz or 14.240 MHz
17 meters: 18.118 MHz
15 meters: 21.313 MHz
12 meters: 24.933 MHz
10 meters: 28.330 or 28.720 MHz
10 GHz (for those in range of QO-100): 10489.640 MHz

(Note that LSB/DIGL is used below 10MHz as per current convention for voice
modes, USB/DIGU otherwise. 60 meters is of course USB/DIGU only.)

As this isn't a contest, there's no pressure to make contacts or send logs,
but you can always confirm QSOs via the usual means if you'd like (LoTW,
eQSL, QRZ, etc.) Enabling reporting (PSK Reporter and FreeDV Reporter) in
the FreeDV application and joining FreeDV Reporter and Discord are
recommended, however, so others can see that you're on the air and hearing
them (for instance, here's the current map of listeners). :D

Feel free to spread this far and wide among your local ham friends and
groups! :) Let me know if you have any questions about the event and
definitely post here if you have issues getting the application working
prior to the event.

Thanks,

-Mooneer K6AQ

[Freetel-codec2] FreeDV at Dayton Hamvention

[Mooneer S. <mo...@gm...>]

Hi all,

Just wanted to give you guys a heads up about our plans for Dayton this
weekend:

1. FreeDV booth: Same place as last year (Building 1, #1909). If you
haven't seen what RADE is capable of, you'll be able to listen to a recent
QSO as it was originally transmitted.
2. Talks: I'll be giving a ~5 minute synopsis of what we've been doing this
past year at the ARDC forum (12:50pm in Room 3 on Friday) as well as a
longer FreeDV/RADE talk on Saturday at 9:15 in Room 4.

Hope to see you guys there if you happen to be in the area :)

Thanks,

-Mooneer K6AQ

Re: [Freetel-codec2] [digitalvoice] Fwd: RATPAC Wednesday MAY 7 - Machine Learning and FreeDV

[Jim T. <jti...@gm...>]

>
>
> *TOMORROW - Wednesday, MAY 7,* *RATPAC Zoom Presentation *
> 9:00 PM ET / 6:00 PM PT /  GMT 02:00 AM Thursday
> *TOPIC: Machine Learning and FreeDV*
> *Facilitator:  Mooneer Salem, *K6AQ <https://www.qrz.com/db/K6AQ>* ◄ Be
> sure to check out Mooneer's QRZ page*
>

I think the meeting is at 9:00 PM ET / 6:00 PM PT, which means it is
actually at 01:00 GMT on Thursday.

- Jim 7J1AJH

[Freetel-codec2] Fwd: RATPAC Wednesday MAY 7 - Machine Learning and FreeDV

[Mooneer S. <mo...@gm...>]

Reminder about my talk tomorrow. Hope to see you there!

-Mooneer K6AQ

---------- Forwarded message ---------
From: RATPAC <rat...@gm...>
Date: Tue, May 6, 2025, 8:10 PM
Subject: RATPAC Wednesday MAY 7 - Machine Learning and FreeDV
To: <mo...@gm...>


*TOMORROW - Wednesday, MAY 7,* *RATPAC Zoom Presentation *
9:00 PM ET / 6:00 PM PT /  GMT 02:00 AM Thursday
*TOPIC: Machine Learning and FreeDV*
*Facilitator:  Mooneer Salem, *K6AQ <https://www.qrz.com/db/K6AQ>* ◄ Be
sure to check out Mooneer's QRZ page*
------------------------------
------------------------------
*Please Join Wednesday's Zoom Meeting*





*https://us02web.zoom.us/j/2128884758?pwd=VAFBYhN9lrnf7ubNOLr93HJoMENQBa.1
<https://us02web.zoom.us/j/2128884758?pwd=VAFBYhN9lrnf7ubNOLr93HJoMENQBa.1>Meeting
ID: 212 888 4758Passcode: RATPAC*
------------------------------
▬ *THURSDAY's PRESENTATION  *▬
*Please plan to join us, Thursday, May 1 - **Topic**: Field Day Update*

*Facilitators: Marty Woll, N6VI <https://www.qrz.com/db/N6VI> and Anthony
Luscre, K8ZT <https://www.qrz.com/db/K8ZT>**Be sure to check out** Marty
and Anthony's QRZ pages (call signs above are linked)*
------------------------------

*·       Past RATPAC Presentations : Published Format list
<https://docs.google.com/spreadsheets/d/e/2PACX-1vTVywG1s025_zsAaKrn8Lr_DPGT6tGV0SVsV5LEdBA91dFCYk_LP8S3kXhMcD9vXFM3Cg-q468jf6Nd/pubhtml>**
//  Menu Format list
<https://docs.google.com/spreadsheets/d/1xwGRjICRo6Cq6nYLgQbZt2bN2xVDb6_SIDW6KFK4nbk/edit#gid=0>*


*·       Website link: https://www.ratpac.us <https://www.ratpac.us>*

*·       Facebook: https://www.facebook.com/ratapacfb
<https://www.facebook.com/ratapacfb>*

*·       YouTube:  https://tinyurl.com/y8sc3jyy
<https://tinyurl.com/y8sc3jyy>*

*·       RATPAC Speaker & Suggestion Form: http://tiny.cc/rp-suggest
<http://tiny.cc/rp-suggest>*

*·       Online scheduler for presenters: *
*https://forms.gle/Vtw6kTHQWYwWM7pUA* <https://forms.gle/Vtw6kTHQWYwWM7pUA>

*73 ~Dan*


*Dan Marler, K7REX <https://www.qrz.com/db/k7rex>*
*rat...@gm... <rat...@gm...>*

<https://www.ratpac.us>

*Join one or more of our Groups.io to receive notifications and participate
in related discussions: *







*RATPAC - https://groups.io/g/RATPAC <https://groups.io/g/RATPAC> NewHams -
https://groups.io/g/NewHams <https://groups.io/g/NewHams> EMCOMM -
https://sec-emcomm.groups.io/g/main <https://sec-emcomm.groups.io/g/main>*
*Please be sure to include your name and call sign when registering. *



*Radio Amateur Training Planning and Activities Committee (RATPAC) *comprises
Amateur Radio Operators of a wide variety of backgrounds and experiences.
Together, we host *twice-a-week* nationwide Amateur Radio Zoom
presentations each *Wednesday and Thursday*. The presentation audience
consists of thousands of amateur radio operators worldwide who participate
directly in the Zoom sessions or with video links of the presentation and
related documentation sent out after each session.

[Freetel-codec2] FreeDV RATPAC talk - May 7, 2025

[Mooneer S. <mo...@gm...>]

Hi all,

I just wanted to let everyone know that I'll be giving a talk on Zoom for
RATPAC about the latest RADE work we've been doing on May 7th, 2025 at 9PM
EDT (UTC-4). More information about RATPAC can be found at
https://www.ratpac.us/. Zoom information is below as well:

https://us02web.zoom.us/j/2128884758?pwd=RG94eEY2L3FiMEg0U3ZIWmhXaEdwdz09
Password: RATPAC

Hope to see you there!

Thanks,

-Mooneer K6AQ

[Freetel-codec2] [Announcement] FreeDV Activity Day - April 19-20, 2025

[Mooneer S. <mo...@gm...>]

Hi all,

This is a reminder that this month's FreeDV Activity Day is this coming
weekend. (As a reminder, Activity Day takes place on the third weekend of
every month.) This event will bring together people interested in HF
digital voice on the air for conversation and fun. Contacts using the
official application as well as ezDV, the SM1000 handheld microphone and
other supporting devices and applications are welcome.

*Event time:* 12AM Pacific time (0700Z) on April 19 to 11:59PM on April 20
(0659Z on April 21) (48 hours).

*Suggested frequencies:*
160 meters: 1.997 MHz
80 meters: 3.625, 3.643, 3.693, 3.697 MHz or 3.850 MHz
60 meters (in countries where allowed): 5.4035 MHz or 5.3665 MHz
40 meters: 7.177 MHz or 7.197 MHz
20 meters: 14.236 MHz or 14.240 MHz
17 meters: 18.118 MHz
15 meters: 21.313 MHz
12 meters: 24.933 MHz
10 meters: 28.330 or 28.720 MHz
10 GHz (for those in range of QO-100): 10489.640 MHz

(Note that LSB/DIGL is used below 10MHz as per current convention for voice
modes, USB/DIGU otherwise. 60 meters is of course USB/DIGU only.)

As this isn't a contest, there's no pressure to make contacts or send logs,
but you can always confirm QSOs via the usual means if you'd like (LoTW,
eQSL, QRZ, etc.) Enabling reporting (PSK Reporter and FreeDV Reporter) in
the FreeDV application and joining FreeDV Reporter and Discord are
recommended, however, so others can see that you're on the air and hearing
them (for instance, here's the current map of listeners). :D

Feel free to spread this far and wide among your local ham friends and
groups! :) Let me know if you have any questions about the event and
definitely post here if you have issues getting the application working
prior to the event.

Thanks,

-Mooneer K6AQ

Re: [Freetel-codec2] Codec 2 used in SDR-based DMR transceiver

[Adrian M. <kan...@dr...>]

On Saturday, 12 April 2025 11:11:18 EEST Maarten Venter wrote:
> Dear Adriaan
> 
> Thank you for this feedback. Would this contribution compile on SM1000 or
> the STM32F405 embedded hardware?
> 
> Looking forward to hearing from you.
> 
> Kind regards

Hi Maarten,

I'm afraid not, because it's using the GNU Radio framework for the DSP and Qt 
for graphics, so it currently would only run on a Linux host and needs too 
much CPU and memory for an embedded platform.

I think maybe the OpenRTX project could use parts of the code as they are and 
write the ARM DSP (mostly symbol sync and RRC filter are the biggest parts) to 
work on real radios like the MD380 (or Connect Systems?). But I don't know 
much about embedded, the toolchains are completely foreign to me.

To be very clear, this is a completely software-based DMR baseband, so it 
would not use the baseband chip on the radio. Why? Because I want to implement 
and test various Tier III trunking features (like full duplex calls, IPv4 
transport) that I don't get on my Tier 3 portable radios and I need low-level 
baseband tweaking access.

I wrote a blog post with more technical details at: 
https://qradiolink.org/open-source-DMR-transceiver-implementation.html

I'd love some feedback, especially regarding the possibility of using some 
type of voice forward error correction with the 2400 bits/s Codec2 rate. But 
this also needs to happen at the repeater so I can't do something on my own 
here.

Best,
Adrian

Re: [Freetel-codec2] Codec 2 used in SDR-based DMR transceiver

[Maarten V. <ven...@gm...>]

Dear Adriaan

Thank you for this feedback. Would this contribution compile on SM1000 or
the STM32F405 embedded hardware?

Looking forward to hearing from you.

Kind regards

On Mon, 31 Mar 2025 at 10:13, Adrian Musceac <kan...@dr...> wrote:

> Greetings,
>
> I would like to report that a DMR transceiver was implemented with SDR
> hardware and using Codec 2 as the audio payload.
>
> The usual audio codec used in commercial DMR implementations is AMBE2+ at
> a
> bitrate of 2450 bits/second. The vocoder socket in each DMR TDMA frame
> (lasting 30 msec of 4FSK symbols) is transmitted every 60 msec and
> includes
> three encoded audio packets of 20 msec each for a total of 216 bits.
>
> I have replaced the audio payload with Codec 2 2400 bits/sec packets also
> consisting of 20 msec each. Some bits in the payload remain unused due to
> the
> small bitrate difference and could potentially be used for other in-band
> signalling.
>
> The audio transmission and reception was tested with MMDVM-based DMR
> repeaters, which allow other types of audio payload to be passed through
> if
> the DMR FID is not set to one of the ETSI or DMRA values. This is
> necessary
> because otherwise MMDVM will try to run AMBE FEC and clobber useful Codec
> 2
> bits.
>
> I can provide other technical details if there is any interest in this.
>
> Adrian YO8RZZ
>
>
>
>
> _______________________________________________
> Freetel-codec2 mailing list
> Fre...@li...
> https://lists.sourceforge.net/lists/listinfo/freetel-codec2
>


-- 
*Maarten Venter*

Re: [Freetel-codec2] Codec 2 used in SDR-based DMR transceiver

[Adrian M. <kan...@dr...>]

On Monday, 31 March 2025 14:32:34 EEST Walter Holmes wrote:
> This sounds incredibly interesting to me.
> 
> Please let us know how does this get implemented?
> 
> Are you modifying an existing radio, to bypass the DMR chip to install the
> custom firmware, like the M17 hack for TYT type radios?
> 
> Or is there some other method to achieve this?
> 
> Many thanks,
> 
> 
> Walter/K5WH

Hi Walter,

I'm afraid it is not that exciting yet, the entire DMR transceiver is 
implemented so far using only Linux host DSP (with open source C++ code and 
libraries) and uses a SDR device as the radio interface (the LimeSDR-mini was 
tested so far).

I hope that the code can provide a starting point for the OpenRTX project (or 
any other related project) in an open source implementation which can run on 
commonly available DMR radios, but this is at the moment out-of-scope for this 
particular case.

There are some slides from a presentation at:
https://qradiolink.org/images/DMR-TRX-GNURadio-Codec2.odp

And a demo video for the functionality at:
https://www.youtube.com/watch?v=h4YrMieKY3Y

I can come back later with more details if needed, since the slides are a bit 
outdated now.
With many thanks to Jonathan Naylor G4KLX who has been so kind to let me use 
parts of his code from MMDVM for this project.

Adrian YO8RZZ

Re: [Freetel-codec2] Codec 2 used in SDR-based DMR transceiver

[Walter H. <wa...@k5...>]

This sounds incredibly interesting to me.

Please let us know how does this get implemented?

Are you modifying an existing radio, to bypass the DMR chip to install the
custom firmware, like the M17 hack for TYT type radios?

Or is there some other method to achieve this?

Many thanks,


Walter/K5WH

-----Original Message-----
From: Adrian Musceac <kan...@dr...> 
Sent: Monday, March 31, 2025 2:49 AM
To: fre...@li...
Subject: [Freetel-codec2] Codec 2 used in SDR-based DMR transceiver

Greetings,

I would like to report that a DMR transceiver was implemented with SDR
hardware and using Codec 2 as the audio payload.

The usual audio codec used in commercial DMR implementations is AMBE2+ at a
bitrate of 2450 bits/second. The vocoder socket in each DMR TDMA frame
(lasting 30 msec of 4FSK symbols) is transmitted every 60 msec and includes
three encoded audio packets of 20 msec each for a total of 216 bits. 

I have replaced the audio payload with Codec 2 2400 bits/sec packets also
consisting of 20 msec each. Some bits in the payload remain unused due to
the small bitrate difference and could potentially be used for other in-band
signalling.

The audio transmission and reception was tested with MMDVM-based DMR
repeaters, which allow other types of audio payload to be passed through if
the DMR FID is not set to one of the ETSI or DMRA values. This is necessary
because otherwise MMDVM will try to run AMBE FEC and clobber useful Codec 2
bits.

I can provide other technical details if there is any interest in this.

Adrian YO8RZZ




_______________________________________________
Freetel-codec2 mailing list
Fre...@li...
https://lists.sourceforge.net/lists/listinfo/freetel-codec2

Re: [Freetel-codec2] Codec 2 used in SDR-based DMR transceiver

[Adrian M. <kan...@dr...>]

On Monday, 31 March 2025 11:50:26 EEST Andy Wood wrote:
> Nice one 😉
> 
> At least the ill-fated dPMR would actually let you choose a codec rather
> than be locked into AMBE.
 
Hi,

The ETSI standard TS 102 361-1 does not specify any particular vocoder for 
DMR, it's up to manufacturers to choose one, and I think AMBE was the 
solution that was converged upon by everyone. I believe there are some 
vendors which do provide alternative vocoders for their DMR transceivers. 
One of them is Hytera.

But otherwise there is no restriction in the standard as to what the audio 
payload should be. There are only some technical and practical 
considerations, such as the availability of a dedicated chip in order to meet 
the stringent power budget of handheld terminals.

Best,
Adrian

Re: [Freetel-codec2] Codec 2 used in SDR-based DMR transceiver

[Andy W. <and...@ho...>]

Nice one 😉

At least the ill-fated dPMR would actually let you choose a codec rather than be locked into AMBE.


-----Original Message-----
From: Adrian Musceac <kan...@dr...> 
Sent: 31 March 2025 09:49
To: fre...@li...
Subject: [Freetel-codec2] Codec 2 used in SDR-based DMR transceiver

Greetings,

I would like to report that a DMR transceiver was implemented with SDR hardware and using Codec 2 as the audio payload.

The usual audio codec used in commercial DMR implementations is AMBE2+ at a bitrate of 2450 bits/second. The vocoder socket in each DMR TDMA frame (lasting 30 msec of 4FSK symbols) is transmitted every 60 msec and includes three encoded audio packets of 20 msec each for a total of 216 bits. 

I have replaced the audio payload with Codec 2 2400 bits/sec packets also consisting of 20 msec each. Some bits in the payload remain unused due to the small bitrate difference and could potentially be used for other in-band signalling.

The audio transmission and reception was tested with MMDVM-based DMR repeaters, which allow other types of audio payload to be passed through if the DMR FID is not set to one of the ETSI or DMRA values. This is necessary because otherwise MMDVM will try to run AMBE FEC and clobber useful Codec 2 bits.

I can provide other technical details if there is any interest in this.

Adrian YO8RZZ




_______________________________________________
Freetel-codec2 mailing list
Fre...@li...
https://lists.sourceforge.net/lists/listinfo/freetel-codec2

[Freetel-codec2] Codec 2 used in SDR-based DMR transceiver

[Adrian M. <kan...@dr...>]

Greetings,

I would like to report that a DMR transceiver was implemented with SDR 
hardware and using Codec 2 as the audio payload.

The usual audio codec used in commercial DMR implementations is AMBE2+ at a 
bitrate of 2450 bits/second. The vocoder socket in each DMR TDMA frame 
(lasting 30 msec of 4FSK symbols) is transmitted every 60 msec and includes 
three encoded audio packets of 20 msec each for a total of 216 bits. 

I have replaced the audio payload with Codec 2 2400 bits/sec packets also 
consisting of 20 msec each. Some bits in the payload remain unused due to the 
small bitrate difference and could potentially be used for other in-band 
signalling.

The audio transmission and reception was tested with MMDVM-based DMR 
repeaters, which allow other types of audio payload to be passed through if 
the DMR FID is not set to one of the ETSI or DMRA values. This is necessary 
because otherwise MMDVM will try to run AMBE FEC and clobber useful Codec 2 
bits.

I can provide other technical details if there is any interest in this.

Adrian YO8RZZ

[Freetel-codec2] [Announcement] FreeDV Activity Day - March 15-16, 2025

[Mooneer S. <mo...@gm...>]

Hi all,

This is a reminder that this month's FreeDV Activity Day is this coming
weekend. (As a reminder, Activity Day takes place on the third weekend of
every month.) This event will bring together people interested in HF
digital voice on the air for conversation and fun. Contacts using the
official application as well as ezDV, the SM1000 handheld microphone and
other supporting devices and applications are welcome.

*Event time:* 12AM Pacific time (0700Z) on March 15 to 11:59PM on March 16
(0659Z on February 17) (48 hours).

*Suggested frequencies:*
160 meters: 1.997 MHz
80 meters: 3.625, 3.643, 3.693, 3.697 MHz or 3.850 MHz
60 meters (in countries where allowed): 5.4035 MHz or 5.3665 MHz
40 meters: 7.177 MHz or 7.197 MHz
20 meters: 14.236 MHz or 14.240 MHz
17 meters: 18.118 MHz
15 meters: 21.313 MHz
12 meters: 24.933 MHz
10 meters: 28.330 or 28.720 MHz
10 GHz (for those in range of QO-100): 10489.640 MHz

(Note that LSB/DIGL is used below 10MHz as per current convention for voice
modes, USB/DIGU otherwise. 60 meters is of course USB/DIGU only.)

As this isn't a contest, there's no pressure to make contacts or send logs,
but you can always confirm QSOs via the usual means if you'd like (LoTW,
eQSL, QRZ, etc.) Enabling reporting (PSK Reporter and FreeDV Reporter) in
the FreeDV application and joining FreeDV Reporter and Discord are
recommended, however, so others can see that you're on the air and hearing
them (for instance, here's the current map of listeners). :D

Feel free to spread this far and wide among your local ham friends and
groups! :) Let me know if you have any questions about the event and
definitely post here if you have issues getting the application working
prior to the event.

Thanks,

-Mooneer K6AQ

[Freetel-codec2] [Announcement] FreeDV Activity Day - February 15-16, 2025

[Mooneer S. <mo...@gm...>]

Hi all,

This is a reminder that this month's FreeDV Activity Day is this coming
weekend. (As a reminder, Activity Day takes place on the third weekend of
every month.) This event will bring together people interested in HF
digital voice on the air for conversation and fun. Contacts using the
official application as well as ezDV, the SM1000 handheld microphone and
other supporting devices and applications are welcome.

*Event time:* 12AM Pacific time (0800Z) on February 15 to 11:59PM on
February 16 (0759Z on February 17) (48 hours).

*Suggested frequencies:*
160 meters: 1.997 MHz
80 meters: 3.625, 3.643, 3.693, 3.697 MHz or 3.850 MHz
60 meters (in countries where allowed): 5.4035 MHz or 5.3665 MHz
40 meters: 7.177 MHz or 7.197 MHz
20 meters: 14.236 MHz or 14.240 MHz
17 meters: 18.118 MHz
15 meters: 21.313 MHz
12 meters: 24.933 MHz
10 meters: 28.330 or 28.720 MHz
10 GHz (for those in range of QO-100): 10489.640 MHz

(Note that LSB/DIGL is used below 10MHz as per current convention for voice
modes, USB/DIGU otherwise. 60 meters is of course USB/DIGU only.)

As this isn't a contest, there's no pressure to make contacts or send logs,
but you can always confirm QSOs via the usual means if you'd like (LoTW,
eQSL, QRZ, etc.) Enabling reporting (PSK Reporter and FreeDV Reporter) in
the FreeDV application and joining FreeDV Reporter and Discord are
recommended, however, so others can see that you're on the air and hearing
them (for instance, here's the current map of listeners). :D

Feel free to spread this far and wide among your local ham friends and
groups! :) Let me know if you have any questions about the event and
definitely post here if you have issues getting the application working
prior to the event.

Thanks,

-Mooneer K6AQ

[Freetel-codec2] FreeDV at Orlando HamCation - February 7-9, 2025

[Mooneer S. <mo...@gm...>]

Hi all,

Just wanted to let everyone know that FreeDV will have a booth at the North
Hall of Orlando HamCation this weekend (near the HamCation prize booth). If
you happen to be in the area, come check us out! More information about
HamCation can be found at https://www.hamcation.com/.

Additionally, I'll be giving a talk about/demoing FreeDV's new RADE mode
tomorrow (February 7) at 3:30pm in CS II (the set of popup tents in the
back of the fairgrounds). Hope to see you there too! Let me know if you
have any questions.

Thanks,

-Mooneer K6AQ

Re: [Freetel-codec2] FreeDV 2.0.0-20250130 released

[Mooneer S. <mo...@gm...>]

Hi Gary,

This might need more runtime from other people to be sure of what's going
on, especially since some others (i.e. Rick) don't seem to have that
problem.

I will note though that there were some tweaks to the transmit level for
the RADE signal, so as a reminder, it's always good to make sure you're not
causing ALC to trigger (adjusting the TX Attenuation slider as needed).

Thanks,

-Mooneer K6AQ

On Thu, Jan 30, 2025 at 10:25 AM Gary Kohtala - K7EK via Freetel-codec2 <
fre...@li...> wrote:

> Thank you for this new preview release, which many of us have
> been anxiously awaiting. Here are my initial impressions:
>
> I noticed something strange with this new version. What may
> possibly be overmodulation, tending to cause a wobbly or garbled
> signal, sometimes dropping out (clipping?). I don't think it was
> conditions,
> although that may have some minor effect. Several stations I monitored in
> the opening moments of running the new version were very obviously
> eating their microphones, and sounded, well, terrible. Their RF signals
> were strong, S9 +20 db, but the audio quality left much to be desired.
> On the plus side, I could *somewhat *clear up the distorted signals by
> opening up my receiver to a full 5 khz bandwidth. But even then, signals
> were not solid, often dropping out, possibly due to what I perceive as a
> clipping effect. Perhaps my terminology is not quite correct, however I am
> just reporting what I am hearing. Perhaps there are better words to
> explain
> the poor signals. My first impression is that transmitted signal quality
> and
> overall reliability was substantially better with the initial preview
> release.
> Perhaps it is pure coincidence, or I am mistaken. It does seem that
> transmit
> audio level settings are more critical in this release.
>
> Something else I noticed is a pulsing sound on the transmitted signal
> (listening
> on the radio, prior to demodulation) of some stations. This may be a
> matter of
> latency on the computers in question. Although anecdotal, as my previous
> comments,
> this pulsing seems to be in association with dropouts, despite an
> excellent RF
> signal.  I do not recall these problems with the initial preview release,
> which
> just worked, and worked well, out of the box.
>
> I will keep a watch on things and report any additional observations. I am
> not being
> critical. Just trying to be thorough as a software tester and consumer.
> Once again,
> thanks very much for making this second preview release available. Much
> appreciated.
>
>
> Best regards,
>
> Gary, K7EK
>
>
> On Thursday, January 30, 2025 at 04:36:58 AM EST, Mooneer Salem <
> mo...@gm...> wrote:
>
>
> Hi all,
>
> This is the second preview release of FreeDV containing the new RADE mode.
> For more information about RADE's development, check out the blog posts on
> the FreeDV website:
>
> * https://freedv.org/davids-freedv-update-feb-2024/
> * https://freedv.org/davids-freedv-update-march-2024/
> * https://freedv.org/davids-freedv-update-april-2024/
> * https://freedv.org/davids-freedv-update-may-2024/
> * https://freedv.org/davids-freedv-update-june-2024/
> * https://freedv.org/davids-freedv-update-july-2024/
> * https://freedv.org/davids-freedv-update-august-2024/
> * https://freedv.org/mooneers-freedv-update-august-2024/
> * https://freedv.org/mooneers-freedv-update-september-2024/
> * https://freedv.org/davids-freedv-update-september-2024/
>
> Changes versus the first preview release:
>
> * Signal to noise ratio (SNR) is now displayed while receiving RADE
> signals.
> * Received signals are now reported to FreeDV Reporter (without callsigns)
> once per second. Once a callsign is received (at the end of the
> transmission), the callsign is reported to both FreeDV Reporter and PSK
> Reporter.
> * Fixed bug preventing sync indicator from turning green with RADE.
> * Visual Studio Redistributable is now installed if your PC does not
> already have it. (This is required for the Python packages FreeDV uses.)
> * Fixed bug preventing Request QSY button from being enabled in RADE mode.
> * RADE has been renamed to RADEV1 in the UI and FreeDV Reporter.
> * macOS binaries are now signed and notarized, avoiding the need for the
> workaround in the previous build.
> * Fixed issue causing FreeDV to segfault on exit when RADE is running.
> * Python files are now precompiled to improve startup time.
> * Core RADE code is now in C (versus Python).
> * Uninstaller now fully cleans up after Python.
> * Audio chain is cleaned up to improve audio quality.
> * README has been updated to clarify Linux instructions and to provide a
> link to a script to auto-build with RADE support. (Thanks @barjac!)
> * Maximum SNR displayed in the main window is now 40 dB to reflect
> real-world testing.
> * "devel" in the version string is shortened to "dev" and incremented to
> "dev2" to reflect the second preview build.
>
> Limitations:
>
> * Multiple RX mode is not supported. If you choose RADE and push Start,
> that's the only mode you can work; you'll need to stop, choose another mode
> and start again to work FreeDV with the existing modes.
> * Squelch cannot currently be disabled with RADE. It's unknown at this
> time whether disabling squelch is possible.
> * Due to compilation problems, 2020/2020B modes are disabled.
> * There is currently no Windows ARM build; this will hopefully be included
> in a future preview build. You may be able to use the 64-bit Intel/AMD
> Windows build in the meantime.
> * Minimum hardware requirements haven't been fully outlined, so your
> system currently may not be able to use RADE. Future planned optimizations
> may improve this.
>
> Other notes:
>
> * The below builds are significantly bigger than previous releases. This
> is due to needing to include Python and the modules that RADE requires.
> Planned porting to C/C++ will eventually negate the need for Python.
> * The Windows build includes Python but not the modules that RADE
> requires. As part of the install process, the version of Python built into
> FreeDV will go out to the internet to download the needed modules.
> * As development is expected to happen quickly, these preview builds have
> a six month expiry date (currently July 30, 2025).
> * 32-bit Windows is no longer supported due to its likely inability to
> work with RADE.
>
> More information and download links can be found at
> https://github.com/drowe67/freedv-gui/releases/tag/v2.0.0-20250130.
>
> Thanks,
>
> -Mooneer K6AQ
> _______________________________________________
> Freetel-codec2 mailing list
> Fre...@li...
> https://lists.sourceforge.net/lists/listinfo/freetel-codec2
> _______________________________________________
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> Fre...@li...
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>