rtl_tcp + op25 = problems

[mccleway]

So I've had rtl_tcp running on my Raspberry Pi 3 for sometime now. Works great. I can start the server and connect to it over my network from a Win 10 desktop running SDR# with no problems.

Enter yesterday.......I decided to install op25 on the same Pi, and play around with it. I was able to get op25 loaded with minimal issues, and had it running just fine. Then I got out of op25 and tried to go back to start rtl_tcp again, and I get 'undefined symbol: rtlsdr_set_bias_tree'. The first time I had the issue, I had a different message that I couldn't find in Google, so I decided to uninstall op25 and rtl-sdr, and start over. I did that, and tried rtl-sdr first, and it worked just fine. Then I installed op25, and it worked just fine. Tried to go back to rtl-sdr and that's when I get the bias_tree message.

From what I can decipher from Google this may have to do with a usb library that's installed. So my question is, is there a way to get them both to play nice with each other? I'm not trying to run them at the same time. I just need to them to run individually.

 

[slicerwizard]

I doubt it says bias_tree.

Sounds like OP25 is using an older RTL interface (on Windows, it would be the rtlsdr.dll file) that is missing the indicated function.

I would make a backup of that file, then install OP25, then restore that file.

 

[mccleway]

You are correct. It's 'bias_tee'. The install is on a raspberry pi running raspbian linux, not windows.

 

[a417]

you might have multiple versions of "rtl_tcp" on your system.

let's look.

 which -a rtl_tcp

If you have more than one listed, then one might work with the libraries you have installed...and one might not.

 

[mccleway]

There's only one version on rtl_tcp on the machine. I just checked. Thanks for recommending it though.

Right now I'm in the process of uninstalling both programs, and reinstalling them doing op25 first, and then rtl-sdr last to see if it makes a difference.

 

[mccleway]

Ok.....I uninstalled both rtl-sdr & op25, then went back and reinstalled them.

This time I did op25 first, and tested it. It worked fine. I shut op25 down, and proceeded to install rtl-sdr V3. Tested it, and it worked fine. Closed it down and went back to try op25 and it doesn't work anymore. Getting this error: "osmosdr source_c creation failure"

 

[boatbod]

It's definitely a library mismatch of some sort. The op25 install.sh script installs various pre-built driver packages and one of these is apparently incompatible with the version that rtl_tcp is using. Suggest installing op25 first, then try building rtl_tcp from sources.

 

[mccleway]

Thanks for the confirmation boatbod. I'll give your suggestion a shot, but I'll admit that "building from source" has always been a mystery for me. I'm not comfortable with the process at all. Anybody got any steps to follow?

 

[mccleway]

I guess I should clarify that last post a little. I'm pretty sure the way that I installed rtl-sdr was "building from source", but not completely sure. The process that I used was directly from the README on the rtl-sdr-blog GitHub page.

rtlsdrblog/rtl-sdr-blog