- osmocom-sdr - lists.osmocom.org

rtl_fm: degraded demodulation caused by self-introduced DC !?
by Hayati Ayguen 19 Jul '15

19 Jul '15

Hi, after i got rtl_fm run on Raspi 2 with Debian Jessie .. now i have some additional noise in the FM demodulated audio! With a "raw" recording (see attachment) i can see an additional carrier at the DC frequency of the demodulated output. That corresponds to the tuned frequency (= 433.25 MHz) parametrized to rtl_fm. Due to calibration error, the FM carrier has some offset: ~ -1.3 kHz as visible in screenshot. The DC carrier does demodulate to some distortion! Option "-E dc" does not help, cause that removes a DC in the demodulated output. An additional option to filter DC before demodulation does help a bit .. but does not solve the problem, which looks to be introduced earlier .. I would not have expected such a DC, cause IMHO it's produced whilst downconversion or filtering. It's not the RTL dongle's DC, which should be far far away by 1/4 of the high samplerate. Someone else seen this problem? Does anyone have a useful solution? kind regards, Hayati

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how/where to merge code
by Hayati Ayguen 18 Jul '15

18 Jul '15

Hi, just wanted to ask, what to do, so that my changes on https://github.com/hayguen/librtlsdr get merged into https://github.com/steve-m/librtlsdr ? Just now, in this moment, i realize, that there's alos git://git.osmocom.org/rtl-sdr.git referenced at http://sdr.osmocom.org/trac/wiki/rtl-sdr Ok, which is the real origin for rtl-sdr? What is needed to get the changes there? Besides the changes on rtl_fm i've developed a small tool, i called "stdin2wav". It's used by piping rtl_fm's output into stdin2wav, which then saves the output into wave files using libsndfile. Besides saving, it can be combined with the squelch function of rtl_fm. stdin2wav closes the wave file when no more data comes from stdin .. and re-opens a new wave file when new data arrives, cause the squelch opened .. Can/should this small tool also merged to rtl-sdr? Someone has a better place? By the way: someone has a better name? kind regards, Hayati

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NBFM problem with rtl_fm on Raspberry Pi 2
by Hayati Ayguen 15 Jul '15

15 Jul '15

Hi, i'm experiencing problems demodulating (NB)FM with rtl_fm, when compiling directly on Raspberry Pi 2 with Raspbian: i just get noise! WBFM does work. And i tested many things like calibration, frequency, samplerate .. directly with a LPD (low power device). rtl_tcp works nice with SDR# and i can verify the calibration with it. In the end, i got paranoid and thought of compiler errors. So i tested the same on a Raspberry Pi (1) B+ with same Raspbian image: That works good. No problems! Anyone else experiencing the same problem? What is the solution? kind regards, Hayati

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osmocom app GUIs don't look correct
by Urban Hakansson 14 Jul '15

14 Jul '15

Hi everybody, I have a problem. Yesterday I installed Fedora 20 (x86_64) laptop the following, bladeRF from nuand, and UHD + GnuRadio + gr-osmosdr + gr-iqbal etc... using Marcus Leech's build-gnuradio script. "$ wget http://www.sbrac.org/files/build-gnuradio && chmod a+x ./build-gnuradio && ./build-gnuradio" I know have installed the following versions. 1) bladeRF: libbladeRF 1.4.0 bladeRF-cli 1.2.0 FPGA: 0.3.0 Firmware: 1.8.0 GnuRadio 3.7.7 UHD 3.9.0 I am running the osmocom_fft utility on both the Ettus B210 and the bladeRF. osmocom_fft -a bladerf=0 -s 1M -f 947M osmocom_fft -a uhd -s 1M -f 947M Both seem to be running fine except that the GUI does not look correct. Please see attached images showing two screen shots of the osmocom_fft GUI. Nuand bladeRF: Center Frequency and Gain Settings are messed up. Text and sliders missing, and the boxes with the actual values are not in the right location. Ettus B210: Center Frequency and RX Gain are messed up.Text and sliders missing, and the boxes with the actual values are not in the right location. Side note: uhd_fft runs without any problems (on the B210) and the GUI looks correct. Nothing is missing or in a strange location on the screen. What can be causing this? How can I fix it? Thank you for your consideration Reagards, Urban Hakansson Senior Software Engineer Tecore Networks Phone: +1 410 872 6315 Fax: +1 410 872 6010 Email: uhakansson(a)tecore.com This e-mail may contain privileged, confidential, copyrighted or other legally protected information, and is intended exclusively for the intended recipient. If you are not the intended recipient (even if the e-mail address above is yours), you may not review, store, use, copy, disclose or retransmit it in any form. If you are not the intended recipient or otherwise have received this by mistake, please immediately notify the sender by return e-mail (or sysadmin(a)tecore.com) then delete the message in its entirety. Thank you.

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sdrangelove build issues on mipsel
by Arturo Borrero Gonzalez 08 Jul '15

08 Jul '15

Hi there, In debian, sdrangelove is having some build issues on mipsel [0]. At first, there was an issue regarding the '-msse2' switch. If I delete the switch, then another build error happens: ======== 8< ======== [...] [ 21%] Building CXX object CMakeFiles/sdrbase.dir/sdrbase/dsp/interpolator.cpp.o /usr/bin/c++ -DQT_CORE_LIB -DQT_GUI_LIB -DQT_MULTIMEDIA_LIB -DQT_NETWORK_LIB -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_WIDGETS_LIB -DUSE_FFTW -Dsdrangelove_EXPORTS -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -O3 -DNDEBUG -fPIC -isystem /usr/include/mipsel-linux-gnu/qt5 -isystem /usr/include/mipsel-linux-gnu/qt5/QtCore -isystem /usr/lib/mipsel-linux-gnu/qt5/mkspecs/linux-g++ -isystem /usr/include/mipsel-linux-gnu/qt5/QtWidgets -isystem /usr/include/mipsel-linux-gnu/qt5/QtGui -isystem /usr/include/mipsel-linux-gnu/qt5/QtOpenGL -isystem /usr/include/mipsel-linux-gnu/qt5/QtMultimedia -isystem /usr/include/mipsel-linux-gnu/qt5/QtNetwork -I/tmp/buildd/sdrangelove-0.0.1.20140824/obj-mipsel-linux-gnu -I/tmp/buildd/sdrangelove-0.0.1.20140824/include -I/tmp/buildd/sdrangelove-0.0.1.20140824/include-gpl -fPIC -o CMakeFiles/sdrbase.dir/sdrbase/dsp/interpolator.cpp.o -c /tmp/buildd/sdrangelove-0.0.1.20140824/sdrbase/dsp/interpolator.cpp In file included from /tmp/buildd/sdrangelove-0.0.1.20140824/sdrbase/dsp/interpolator.cpp:4:0: /tmp/buildd/sdrangelove-0.0.1.20140824/include-gpl/dsp/interpolator.h:4:23: fatal error: immintrin.h: No such file or directory #include <immintrin.h> ^ compilation terminated. [...] ======== 8< ======== Do you have any hint for this? Thanks, best regards. PS: Please keep me in CC, i'm not subscribed. [0] https://buildd.debian.org/status/fetch.php?pkg=sdrangelove&arch=mipsel&ver=… -- Arturo Borrero González

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[PATCH] add get/set BW for rtl-sdr
by P 26 Jun '15

26 Jun '15

This patch use freshly implemented feature of rtl-sdr for R820T frontend, bandwidth setting. As of current version BW value cannot be get from rtl-sdr, so only original set value is used.

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Multiple hackrf boards support (patch)
by Heikki Hannikainen 02 Jun '15

02 Jun '15

Hi, I have a little pull request for gr-osmosdr, to enable multiple devices support for hackrf. This allows doing things like full duplex using two boards in a single graph. You can specify either hackrf=0 and hackrf=1 to select by a device index, or the serial number (or an unique suffix of a serial number), hackrf=f00d and hackrf=1234abba. hackrf_info lists multiple devices and their serial numbers. Apps like gqrx seem to magically work, too, and allow device selection. The hackrf project just merged the pull request for libhackrf & tools 3 days ago, and it's already available in macports at least. The gr-osmosdr patches here do work against old libhackrf as before, it detects the presence of the new hackrf_device_list API and enables multiple device support only if it is available. What is the preferred patch format, I have the changes available as a feature branch in github? https://github.com/hessu/gr-osmosdr/tree/feature/hackrf_multidev - Hessu

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how to compile librtlsdr for cygwin?
by Simon Eigeldinger 30 May '15

30 May '15

Hi all, anyone could help me with compiling librtlsdr for cygwin to use it in some software i want to compile with cygwin? greetings and thanks, simon -- Simon Eigeldinger Follow me on Twitter: http://www.twitter.com/domasofan/ E-Mail: simon.eigeldinger(a)vol.at MSN: simon_eigeldinger(a)hotmail.com ICQ: 121823966 Jabber: domasofan(a)andrelouis.com --- Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft. http://www.avast.com

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BW setting for R802T tunner
by Jiří Pinkava 29 May '15

29 May '15

Hi, this series of patches add BW setting support for R820T and interface to set BW explicitly. This work is partialy based on some patches flying around namely Alexander Kurpiers. Testing have been done for some dongles at it looks good except for rally narrow BW setting. No testing of BW setting have been performed for other RF frontends i have only R820T now. JP

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build/compiling gr-osmosdr airspy error
by Andreas Ladanyi 29 May '15

29 May '15

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