Re: [Discuss-gnuradio] using DAB+FM+DVB-T dongle for spectrum monitoring

[Nate Temple]

Hi vempati,

You need to blacklist the default driver for the RTL.

Create/open this file: sudo nano /etc/modprobe.d/rtlsdr-blacklist.conf

And add the 3 lines below to it, and then restart your machine.

blacklist dvb_usb_rtl28xxu
blacklist rtl2832
blacklist rtl2830


- Nate





> On Apr 4, 2016, at 11:15 PM, vempati Sarma <address@hidden> wrote:
> 
> Hi All,
> I am trying to use my first hardware with gnuradio and facing problems.Would 
> be thankful for any help.
> DAB+FM+DVB-T dongle; alternately described as 
> DVB-T tv stick DAB RTL2832U R820T 25MHz-1700MHz
> (SDR E4000 upgrade version) for Win 8 HMP_430
> My OS is Ubuntu 14.04 LTS on Compaq nx6115.
> Since I am not familiar with intricacies of build and file structures,
>  I preferred to use default in-built versions of gnuradio and other software 
> of Ubuntu packages.
> I installed gr-osmocom with Synaptic Package manager.
> On opening gnurdaio-comapnion I find osmocom source, rtl-sdr source in blocks 
> menu.
> For first trial I just connected RTL-SDR source with WX FFT sink, expecting 
> to see spectrum.
> 
> Here is the log:
> ---------------
> << Welcome to GNU Radio Companion 3.7.2.1 >>>
> 
> Loading: "/home/vsrks/dongle1.grc"
> >>> Done
> 
> Showing: "/home/vsrks/dongle1.grc"
> 
> Generating: "/home/vsrks/top_block.py"
> 
> Generating: "/home/vsrks/top_block.py"
> 
> Executing: "/home/vsrks/top_block.py"
> 
> linux; GNU C++ version 4.8.2; Boost_105400; UHD_003.005.005-0-unknown
> 
> Using Volk machine: sse3_32_orc
> gr-osmosdr 0.1.1 (0.1.1) gnuradio 3.7.2.1
> built-in source types: file osmosdr fcd rtl rtl_tcp uhd hackrf bladerf 
> rfspace 
> Using device #0 Realtek RTL2838UHIDIR SN: 00000001
> 
> Kernel driver is active, or device is claimed by second instance of librtlsdr.
> In the first case, please either detach or blacklist the kernel module
> (dvb_usb_rtl28xxu), or enable automatic detaching at compile time.
> 
> usb_claim_interface error -6
> 
> FATAL: Failed to open rtlsdr device.
> 
> Trying to fill up 1 missing channel(s) with null source(s).
> This is being done to prevent the application from crashing
> due to gnuradio bug #528.
> ----------
> END of log.
> 
> I find from archives a similar problem was raised in January, 2016,
>  but I did not locate the solution. Any suggestions on how to modify the 
> configuration?
> I tried rmmod command but system replies with 'in use' error message,
>  indicating device is claimed as soon as inserted.
> 
> -- 
> vsrk sarma
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