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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