osmocom-sdr

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904 discussions

Incorrect Sampling Rate
by Knee, Peter A 13 Dec '12

13 Dec '12

All, I have been experimenting with the Realtek dongle and am noticing some strange behavior. There is one sampling rate that I can not seem to get to match up with the number of samples that I'm receiving asynchronously. Specifically, when I try to sample at 514 kHz, I receive samples at approximately half this rate. Has anyone experienced something similar? I've tried looking through the Osmocom driver but everything looks good and it's really odd that everything looks good for other sampling rates. Just for reference, when I run rtl_sdr, I get the following device information: Found 1 device(s): 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Found Elonics E4000 tuner Any help would be appreciated! Thanks, Peter

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Update: New and improved airplane stuff
by keenerd 12 Dec '12

12 Dec '12

A few new features have been pushed in the last two days. Most significant is rtl_adsb, a fast and simple ADS-B decoder. It is not the most sensitive decoder (Prog's and rtl-1090 pick up a few more planes) but it works fairly well. Of course it lacks the interactive maps of other software, however the output can be piped into fancier programs or across the network with netcat. To use it, just run "rtl_adsb". It does not need any options and can pick up plenty of signals with only the stock antenna. Here is a snippet if you plan to use rtl_adsb over the network: while true; do rtl_adsb -R | nc -lp 8080; done Where -R enables raw mode, 8080 is the port of choice, and the while loop restarts netcat after network disconnections. Rtl_fm also got a few tweaks to make it work better with AM voice airband. Rtl_fm could always do scanning but it needed every frequency listed out explicitly. Kind of awkward with hundreds of airband channels. So now you can use ranges: rtl_fm -M -f 118M:137M:25k -s 12k -l 280 | .... That will scan every voice channel. Adjust squelch level for local conditions. Also of note are two little convenience features in rtl_fm. If the output filename is omitted, stdout is assumed. And the use of k/M/G in addition to e3/e6/e9. -Kyle http://kmkeen.com

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Problem under OpenBSD
by Alan Corey 11 Dec '12

11 Dec '12

Under OpenBSD 5.0 I get: Linking C executable rtl_test /usr/bin/ld: cannot find -lrt collect2: ld returned 1 exit status gmake[2]: *** [src/rtl_test] Error 1 gmake[1]: *** [src/CMakeFiles/rtl_test.dir/all] Error 2 gmake: *** [all] Error 2 It built librtlsdr.so.0.0, rtl_eeprom, rtl_fm, rtl_sdr, rtl_tcp so I think it mostly worked. In /usr/tmp/hardware/rtl_dongle/osmocom/git/rtl-sdr/build/src/CMakeFiles/rtl_test.dir/link.txt I see: -lpthread -lm -lrt -Wl The whole link.txt says (continuation \ added by me to shorten lines): /usr/bin/gcc -DNDEBUG -L/usr/local/lib CMakeFiles/rtl_test.dir/rtl_test.c.o \ -o rtl_test librtlsdr.so.0.0 /usr/local/lib/libusb-1.0.so.1.0 -lpthread -lm \ -lrt -Wl,-rpath,/usr/tmp/hardware/rtl_dongle/osmocom/git/rtl-sdr/build/src \ -Wl,-rpath-link,/usr/X11R6/lib:/usr/local/lib It looks like it's trying to link against a library it hasn't installed yet. Is this just an OpenBSD thing or has it happened to anyone else? I saw hamlib do something similar but I had an old version of that installed. Alan, ab1jx ---------------------------------------------- Radio Astronomy - the ultimate DX

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Gr-osmosdr and rtl_tcp with local rtlsdr connected.
by Ben Z en de rest 09 Dec '12

09 Dec '12

Hi all, I am trying to run multimode in grc and have it connect to a rtl_tcp server on another pc. (RaspberryPi) If I do this on a machine without local rtl-sdr that does work. If I run this at a pc which has also a local rtl-sdr it always chooses rtl device 0 and not the rtl_tcp server. Both systems run ubuntu 12.04 and the same grc and multimode versions. The commando used on both systems is python multimode.py --devinfo=rtl_tcp= 192.168.0.50:1234 Any hints how to solve this? Thanks, Ben

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Troubles with gr-osmosdr on ubuntu
by Marek Pietrzak 09 Dec '12

09 Dec '12

Hi, I'm trying to make my rtl dongle work with gnuradio 3.6.1 on ubuntu 12.10. I compiled both recent rtlsdr and gr-osmosdr and all installed fine. Right now I have osmosdr on the list of sources in gnuradio and want just the example FFT display. When I run it the device gets opened without errors but apparently I get no samples, because the plot is blank. The dongle is Terratec T Stick PLUS and it works ok with rtl_fm. Any hint what can be wrong? The output when running: linux; GNU C++ version 4.7.0; Boost_104900; UHD_003.004.002-0-unknown Using Volk machine: sse3_32_orc gr-osmosdr supported device types: file osmosdr fcd rtl rtl_tcp uhd Using device #0 Realtek RTL2838UHIDIR SN: 00000001 Found Elonics E4000 tuner This may be of interest - strace repeating output: poll([{fd=4, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=4, revents=POLLOUT}]) writev(4, [{"\20\0\10\0\30\0\200\4_NET_SUPPORTING_WM_CHECK", 32}, {NULL, 0}, {"", 0}], 3) = 32 poll([{fd=4, events=POLLIN}], 1, -1) = 1 ([{fd=4, revents=POLLIN}]) recv(4, "\1\0\33\f\0\0\0\0\243\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 4096, 0) = 32 recv(4, 0xa5b6de8, 4096, 0) = -1 EAGAIN (Resource temporarily unavailable) recv(4, 0xa5b6de8, 4096, 0) = -1 EAGAIN (Resource temporarily unavailable) Regards, Marek

1 0

E4000
by Mathias Coinchon 05 Dec '12

05 Dec '12

Hello, I was wondering if it's still possible nowadays to find on the market RTL2832 USB sticks based on the Elonics E4000 tuner since they went bankrupt. It seems that most of tuner chips used now are based on Fitopower FC0013. In term of performance, which one is the best according to your experience ? Regards Mathias

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Who do I contact if osmocom-sdr git repositories are inaccessible?
by Edward Brabant 03 Dec '12

03 Dec '12

Hello - I cannot access the git://git.osmocom.org/rtl-sdr and git://git.osmocom.org/gr-osmosdr repositories. What is the name of the contact who is responsible for maintaining the osmocom-sdr git respositories, and what is their email address? Details of the repositories errors are: [brabante@localhost build]$ git clone --progress git://git.osmocom.org/rtl-sdr Initialized empty Git repository in /home/brabante/devel/gnuradio/build/rtl-sdr/.git/ git.osmocom.org[0: 213.95.46.201]: errno=Connection refused git.osmocom.org[0: 2001:780:45:f046::201]: errno=Network is unreachable fatal: unable to connect a socket (Network is unreachable) and [brabante@localhost build]$ git clone --progress git://git.osmocom.org/gr-osmosdr Initialized empty Git repository in /home/brabante/devel/gnuradio/build/gr-osmosdr/.git/ git.osmocom.org[0: 213.95.46.201]: errno=Connection refused git.osmocom.org[0: 2001:780:45:f046::201]: errno=Network is unreachable fatal: unable to connect a socket (Network is unreachable) Thanks in advance. Regards, Ed Brabant, Contractor SPAWAR (Space and Naval Warfare Systems Command) Systems Center (SSC) Pacific Joint Tactical Networking Center (JTNC), Technical Directorate (TD), Standards Group office: 619-767-4397

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Re: New User - Setup Problem - osmo/rtl-sdr and grc - Mac OSX
by Ken FitzGerald-Smith 03 Dec '12

03 Dec '12

> > This put everything in the correct place, but still a no-go. Python chokes on the line in top_block.py that says "import osmosdr". Module not found. > > I tried PYTHONPATH again to see if I could give python a hint, but no go. > > Just seems that python needs to be able to find the osmosdr module. Kevin, presuming you have an otherwise clean build now of everything, and that it is all located in /opt/local then without me explaining why yet, try the following: PYTHONPATH=/opt/local/lib/python2.7/site-packages \ DYLD_FALLBACK_LIBRARY_PATH=/opt/local/lib/python2.7/site-packages:/opt/local/lib \ DYLD_FRAMEWORK_PATH=/opt/local/Library/Frameworks gnuradio-companion /Users/mcquiggi/Desktop/top_block.py I just appended your original python file to the end but you can just decide to launch the app by itself if you wish If it doesn't work, you could check and see what exists at those locations before reporting back. ls -lA /opt/local/lib/python2.7/site-packages ls -lA /opt/local/lib/python2.7/site-packages:/opt/local/lib ls -lA /opt/local/Library/Frameworks I am bit rushed just now but I can explain my research & solution later. Ken

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RTL-SDR in gnuradio, compilation problem
by Martin Bruchanov 02 Dec '12

02 Dec '12

Hello, I'm trying to get work RTL dongle in gnuradio, but when I'm compiling the gr-osmosdr, there is still LIBRTLSDR_FOUND = FALSE. I've checked the cmake input module and tried to correct path for libraries to /usr/lib64, but I cannot find the *.h files for librtlsdr.so (i've got rtl-sdr form git). Thank you for help. Martin PS: I'm using Fedora Core 17, AMD64. -- Martin Bruchanov Skype : bruxytronics WWW : http://bruxy.regnet.cz/ GPG-Key : http://bruxy.regnet.cz/bruxy-gpg.key (0x8107ED53) Linked-In : http://www.linkedin.com/in/bruxy Google+ : http://gplus.to/BruXy

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New User - Setup Problem - osmo/rtl-sdr and grc - Mac OSX
by Kevin McQuiggin 02 Dec '12

02 Dec '12

Hi All: A question and plea for help please! I am new to the list. I have used the rtl-sdr/osmosdr blocks in gnuradio companion before under Ubuntu, but am having problems getting them set up under Mac OS. My gnuradio/grc install used the macports facility. Took a bit of time to get everything to compile, but grc comes up okay. I have successfully downloaded, cmake/make, and installed the rtl-sdr and gr-osmocom packages from git. I had to move all the installed files from /usr/local to /opt/local in order to get everything into the right place for the macports gnuradio to find it. What works: I can load grc and see the osmocom/rtl-sdr blocks. I can add and modify them as usual. Here's a screen shot: What doesn't work: When I generate/run the flow graph, I get messages indicating that the osmosdr module cannot be found: --- Executing: "/Users/mcquiggi/Desktop/top_block.py" Traceback (most recent call last): File "/Users/mcquiggi/Desktop/top_block.py", line 19, in <module> import osmosdr ImportError: No module named osmosdr >>> Done --- Note also that from my xterm if I enter simply: Kevins-MacBook-Air:~ mcquiggi$ python -c "import osmosdr" Traceback (most recent call last): File "<string>", line 1, in <module> ImportError: No module named osmosdr Kevins-MacBook-Air:~ mcquiggi$ I get a python error. There is an 'osmosdr' directory in /opt/local/lib/python2.7/site-packages/. What I have tried: - creatling a soft link called 'osmosdr' (ln -s) in /opt/local/lib/python2.7/ to /opt/local/lib/python2.7/site-packages/osmosdr - setting PYTHONPATH to /opt/local/lib/python2.7/site-packages/ Here is the contents of /opt/local/lib/python2.7/site-packages/osmosdr: Kevins-MacBook-Air:~ mcquiggi$ ls /opt/local/lib/python2.7/site-packages/osmosdr __init__.py _osmosdr_swig.so osmosdr_swig.pyo __init__.pyc osmosdr_swig.py __init__.pyo osmosdr_swig.pyc Kevins-MacBook-Air:~ mcquiggi$ So it looks like it -may- be a simple problem to solve, but I lack the necessary knowledge of how osmosdr integrates with gnuradio. Any help appreciated, Kevin

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