The OP25 Group in 2009/2010 added a software TX for P25 FDMA which was based on the fullrate MBE codec contribution made by Pavel Yazev.
Today with the addition of a halfrate encoder we announce a software TX for two amateur radio digital voice modes (dstar and ysf) as well as 2-slot DMR Base Station support in addition to the existing P25 TX. The ysf support includes both halfrate and fullrate voice modes. At this time my impression of the voice quality is very good to excellent in all modes except dstar where it may be considered only fair; we believe the issues with the dstar codec will be very amenable to improvement over time.
The software has been tested successfully using a PC+soundcard connected to an Icom IC-820H via the high-speed (packet 9,600 data input) connector in the back of the radio. Support for SDR TX devices such as the hackrf and usrp will be added at some point.
To get started, clone the repo, checkout the 'max' branch, and open the doc html file in your browser: git clone https://git.osmocom.org/op25 cd op25 git checkout max Then use your favorite web browser to view the file op25/gr-op25_repeater/apps/tx/doc.html within the repo.
73
Max
My testing was limited due to 'only' having a HackRF to test with. Once support for that is added I'll be able to comment more.
Excellent work Max and the whole OP25 team!
Sent from my iPhone
On Mar 22, 2017, at 10:31, ikj1234i@yahoo.com [op25-dev] op25-dev@yahoogroups.com wrote:
The OP25 Group in 2009/2010 added a software TX for P25 FDMA which was based on the fullrate MBE codec contribution made by Pavel Yazev.
Today with the addition of a halfrate encoder we announce a software TX for two amateur radio digital voice modes (dstar and ysf) as well as 2-slot DMR Base Station support in addition to the existing P25 TX. The ysf support includes both halfrate and fullrate voice modes. At this time my impression of the voice quality is very good to excellent in all modes except dstar where it may be considered only fair; we believe the issues with the dstar codec will be very amenable to improvement over time.
The software has been tested successfully using a PC+soundcard connected to an Icom IC-820H via the high-speed (packet 9,600 data input) connector in the back of the radio. Support for SDR TX devices such as the hackrf and usrp will be added at some point.
To get started, clone the repo, checkout the 'max' branch, and open the doc html file in your browser:
git clone https://git.osmocom.org/op25 cd op25 git checkout max Then use your favorite web browser to view the file op25/gr-op25_repeater/apps/tx/doc.html within the repo.
73
Max
osmosdr device support for the digital voice TX (dv_tx.py) has been pushed to the repo. This has been tested using the hackrf (jawbreaker) only but should work with any device supported by the osmosdr drivers (to include the USRP, etc).
Also there has been a backlog of changes in the 'max' branch that are now merged into master; at this point both 'master' and 'max' are the same.
For info on running the DV TX app (including the additions to support osmosdr), see the doc.html file in the repo [op25/gr-op25_repeater/apps/tx/doc.html]
Max
Max,
Thanks for all your hard work on this project.
P.S. For anyone that saw my post from a couple weeks ago... I ended up and rebuilt my system on new hardware and its behaving well. No idea why hardware that worked fine for 6+ weeks steady last summer isn't good enough any longer but this system is more power efficient anyway so its a win.
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Apu apu＠spfld.com [op25-dev] -
ikj1234i＠yahoo.com [op25-dev]
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Mark “Dygear” Tomlin dygear＠gmail.com [op25-dev]