OP25 VirtualBox Project - Run OP25 on Windows 7

[KA1RBI]

screen shots per your request:

ok just as a guess, it looks like you might be off frequency just slightly. Both the FFT and the Datascope suggest activity just below the frequency that the receiver is tuned to. Can you try adjusting the PPM and then the Fine tune sliders so as to lower the tuned frequency by 5 or 10 Khz. Then try adjusting the command line 'q' value up and down slightly (in increments of +1 or -1) until the signal is centered without resorting to the sliders. I've seen cases where the reported PPM values need to be tweaked a bit so this wouldn't be the first time for that...

 

[tlefkowitz]

op25

Out of desperation, I tried this, suggested yesterday by PiccoIntegra, I think:

./scope.py --args "rtl=0" -N 'LNA:42' -f 859.10000e6 -S 2400000 -q 47 -v 0

The Traffic Window comes alive again. Of course, the above is missing my .tsv info

What gives?
Todd

 

[KA1RBI]

Out of desperation, I tried this, suggested yesterday by PiccoIntegra, I think:

./scope.py --args "rtl=0" -N 'LNA:42' -f 859.10000e6 -S 2400000 -q 47 -v 0

The Traffic Window comes alive again. Of course, the above is missing my .tsv info

What gives?
Todd

If you look at the FFT (spectrum) and the eye (datascope) when things are working you should see a centered signal and have a reference for how things should look, for comparison purposes. If the problem is due to a slight frequency offset (this is a very common "error" reported to the GNU Radio mailing list) there is only a limited number of things that can cause it. There are a couple of command line options (-q and -c and somewhat, -o) that specifically address the problem, with -c being a last resort, but really should not be necessary. Long ago Scott might have mentioned problem when using -o in some cases, can't recall details (??).

There might also be a stray warning message issued when the scope app started that could provide a clue. It is puzzling that there is a difference when adding -T - how much of a difference in the FFT do you observe with and without -T ?

Separately, when running with your list of multiple control channels specified, I'd expect the program to be hunting among all of them (with messages issued appropriately).

Max

 

[KA1RBI]

Another feature to program would be a "Resume Scan" button. On busy systems it is must have!

The "skip" feature has been now been fixed, thanks to Joe for testing and giving feedback.

The way this works is when 'skip' is pressed the currently-active talkgroup is blacklisted for one second, to allow any other system activity to be heard.

Also, I've done a rollup of all of the changes in the 'max' git branch and merged into master. So it's no longer necessary to check out the 'max' branch since everything that was/is in there is now also in master.

Nothing bad will happen if you continue to use 'max' however...

73

Max

 

[tlefkowitz]

Thanks to many of you great people, I am up and running in Tucson. Unfortunately, I had to go to Phoenix for the weekend and am having TeamViewer audio issues.

Trunking question..my SDR is tuned to the Simulcast North control channel on 859.1 (Tucson PCWIN Phase II system). There are other control channels for other areas in S Arizona, on other frequencies...Simulcast North comes in loud and clear at my home QTH. Should I expect to hear only the users in my local area or should the entire S Arizona system be receivable with OP25 running on 859.1?

Thanks
Todd

 

[tlefkowitz]

remote audio OP25 on Linux

Hi Gang

I have OP25 working on my home Linux Mint. I usually use TeamViewer to remote into the Linux machine. I cannot figure out how to get audio from the Linux machine to be audible in TeamViewer. Any recommendations, since I would like to hear audio while I'm away from home

Thanks

 

[br0adband]

I ended up having to install the Pulse Audio control panel thing (sorry, can't recall the precise name of it and I don't even have Linux Mint installed presently, go figure) which then allowed me to "pipe" the audio out to Audacity for recording purposes - you may have to do something similar and create a new pipe of sorts that Teamviewer can pick up on for broadcasting it as needed.

Wasn't all that easy to do since I'm far from a Linux expert but after an hour or two of reading and research I discovered that control panel add-on for Pulse Audio gave me the capability to do what I wanted, it could be just what's needed for your situation as well.

I swear, not to knock on Linux or OP25 in any manner, but if and when DSD+ gets P25 Phase II decode capability, that's just going to blow things wide open all over again.

 

[tlefkowitz]

op25

Yes...I am trying to figure out how to install Pulse Audio but am such a Linux noob and not very skilled in installing Linux apps

 

[br0adband]

Pulse Audio is already part of Linux Mint, what you need to install is the control applet that lets you make adjustments to how Pulse Audio handles and redirects the audio internally, more or less. The actual application is known as Pulse Audio Volume Control and you install it with:

sudo apt-get install pavucontrol

and then it'll appear in the Audio section of the flyout menu (it's a GUI program, not command line). You can find more info here:

Adjust Volume of Individual Applications with PulseAudio | Tombuntu

Without that installed and configured right I could not get Audacity to "tap" into the audio coming from OP25 - once that control thing was installed it was fairly easy to accomplish things, I'm guessing if you install it you should be able to figure out how to route things towards Teamviewer as easily.

You won't be able to do anything unless there's an audio source, so don't forget to actually have OP25 running and providing an audio signal for the control app to "see" before you run it or else it won't be able to do anything at all. Once an audio source is visible, however, then you can configure things and PAVUControl will remember it for future uses.

 

[tlefkowitz]

op25

YES..I think that will work

Thanks, as usual

 

[tlefkowitz]

op25

Stuck as usual

I brought up PulseAudio. It shows ALSA plugin Python as the playback source, I believe; the meter shows activity every time OP25 audio is seen. In Configuration, I used Analog Stereo, and both input and output tabs have Analog Stereo Output chosen and show activity. I still don't hear anything through Team Viewer, though. Surely I am missing something here

Todd

 

[tlefkowitz]

remote audio OP25 on Linux

I have been working with PiccoIntegra trying to get remote audio via TeamViewer...I would like to hear my OP25 audio during the day when I'm away from the home OP25 Linux machine. I usually use Team Viewer to remote into my Linux machine. All of OP25 shows up, and when I bring up the Pulse Audio and Sound apps, the Alsa plug-in shows audio activity...in both inputs and outputs screens..yet NO audio on my traveling PC. Can anyone suggest another way of getting my OP25, and audio???

Frustrated but hopeful

Todd

 

[mrlindstrom]

These guys were on Ubuntu but the steps looked pretty generic aside from the package tool:

wine - Teamviewer 9 Ubuntu 13.10 Sound - Ask Ubuntu

 

[Scannerfan15]

If I use a discriminator tap from a scanner, how do I tell op25 to use CQPSK LSM demodulation?

If I decode a non-simulcast C4FM signal, op25 works fine with no decode errors or lost packets, but when I try to decode a simulcast CQPSK LSM system near to my location, It works sometimes when it wants to but has alot of decode errors.

 

[tlefkowitz]

remote audio OP25 on Linux

Hi All

Finally figured out how to get remote audio...instead of Team Viewer, I was able to install Splashtop on the Linux machine and on my Mac. They offer a deal for $1.99/mo that allows access to home PC from any network. Audio came roaring in, once I figured out how to install Slashtop with the Ubuntu Software Center...which itself required instructions on how to adapt it for Mint!

Thanks for help and encouragement

Todd

 

[AZScanner]

Thanks to many of you great people, I am up and running in Tucson. Unfortunately, I had to go to Phoenix for the weekend and am having TeamViewer audio issues.

Trunking question..my SDR is tuned to the Simulcast North control channel on 859.1 (Tucson PCWIN Phase II system). There are other control channels for other areas in S Arizona, on other frequencies...Simulcast North comes in loud and clear at my home QTH. Should I expect to hear only the users in my local area or should the entire S Arizona system be receivable with OP25 running on 859.1?

Thanks
Todd

Hi Todd,

A fellow Tucsonian! Awesome! Just moved here a few months ago after 20+ years in Phoenix and I've been really enjoying it. Phoenix was just becoming too "L.A." for me.

To answer your question, I've found I get the most bang for my OP25 buck if I scan Simulcast B. You'll hear much more on A or B than you will on North.

As for live audio, I see you got that figured out another way, but I use icecast/ices2 to stream audio from my soundcard output for listening to my OP25 setup on the go. Do a little googling on it - if you got OP25 up and running, getting Icecast and Ices2 working will be a snap compared to all that. I just have mine set up to stream the output from pulseaudio and leave OP25 running with the speakers turned down. Works great!

-AZ

 

[tlefkowitz]

Hi Todd,

A fellow Tucsonian! Awesome! Just moved here a few months ago after 20+ years in Phoenix and I've been really enjoying it. Phoenix was just becoming too "L.A." for me.

>>Hi AZ..pleased to meet you, too. Spent 35 + yrs in Scottsdale,and have the same feelings about the LA thing..kids and parents are still up in the Valley. I live in Oro Valley and practice in Tucson, near St Joe's Hosp..ophthalmology.

I am a ham, N7PMP, but haven't been active in years. I still love listening, and SDR-RTL has brought me back with a vengeance. The fun of finding out what I can do with the dongles has brought me to OP25..a real challenge, but I have it up and running, thanks largely to members of the RR forums. Linux is still a new thing for me. I bought a SSD for my Windows7 PC and installed Linux Mint on it.

To answer your question, I've found I get the most bang for my OP25 buck if I scan Simulcast B. You'll hear much more on A or B than you will on North.

>>I was wondering about that...so, I can add Sim B to my file? I am delighted with what I get from N, but am always looking for more.

As for live audio, I see you got that figured out another way, but I use icecast/ices2 to stream audio from my soundcard output for listening to my OP25 setup on the go. Do a little googling on it - if you got OP25 up and running, getting Icecast and Ices2 working will be a snap compared to all that. I just have mine set up to stream the output from pulseaudio and leave OP25 running with the speakers turned down. Works great!

>>That's a great suggestion. A networking guy was installing new workstations in new exam rooms just before lunch. I cornered him and asked about my Linux sound issues. He suggested looking up Linux Audio Servers, and at Starbucks I googled it...alas, Icecast came up. A few mins later, I found your post!!

I will definitely download it and let you know.

Best
Todd
eyeman27@earthlink.net

 

[tlefkowitz]

remote audio server

AZ

I have downloaded ICES and Icecast 2 to my Linux machine and have installed them

How do I add ICES/Icecast 2 to my streams on Pulse Audio....haven't been able to figure this one out. I do have PulseAudio Manager installed as well

Thanks
Todd

 

[tlefkowitz]

icecast for op25

AZ

I have Icecast 2 running..still stuck at how to use it to stream audio from OP25..please advise

Todd

 

[tlefkowitz]

AZ

I'm not finding any SDR# activity on the Sim A or Sim B up here in Oro Valley...plenty on Sim N

Todd