December 2012 - osmocom-sdr - lists.osmocom.org

Trying to use rtl_fm, etc
by Alan Corey 02 Jan '13

02 Jan '13

With rtl_fm, I get a tiny burst of audio about once a minute. My dongle is a vendor ID 0x0bda, product ID0x2838 from http://www.amazon.com/gp/browse.html?ie=UTF8&marketplaceID=ATVPDKIKX0DER&me… I did: rtl_fm -f 88500000 - | play -t raw -r 24k -e signed-integer -b 16 -c 1 -V1 - I got: Found 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 00000013 Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Found Rafael Micro R820T tuner -: (raw) Encoding: Signed PCM Channels: 1 @ 16-bit Samplerate: 24000Hz Replaygain: off Duration: unknown In:0.00% 00:00:00.00 [00:00:00.00] Out:0 [ | ] Clip:0 Oversampling input by: 42x. Oversampling output by: 1x. Buffer size: 8.13ms Tuned to 88752000 Hz. Sampling at 1008000 Hz. Output at 24000 Hz. Exact sample rate is: 1008000.009613 Hz Tuner gain set to automatic. In:0.00% 00:00:00.68 [00:00:00.00] Out:16.4k [ =====|===== ] Clip:0 ^CSignal caught, exiting! The dongle works if I boot into Windows, but in OpenBSD I can't get anything out of it. I'm still trying to get dependencies for Gnuradio together. The only odd thing is that being OpenBSD, there's no -lrt when I link. Those functions are built into something else so I compile without the -lrt. There isn't an -lrt library. I've tried writing little scripts to run it so I do it consistently. My wide FM one: #!/bin/sh rtl_fm -W -l 0 -f 88500000 - | play -t raw -r 32000 -e signed-integer -b 16 -c 1 -V4 - Narrow: #!/bin/sh rtl_fm -N -l 0 -f 162550000 - | play -t raw -r 32k -e signed-integer -b 16 -c 1 -V4 - I've played with various options. If I use -R it runs for a long time with lots of data by Sox's meter, but I don't hear anything. If I pipe it to a file (without -R) the file is very small and grows slowly, not what I would expect from audio. I just grabbed a fresh copy by git yesterday but it works about the same. A fresh run: freebie# rtl_fm -N -f 162550000 - | play -t raw -r 32k -e signed-integer -b 16 -c 1 -V 4 - Found 1 device(s): play: SoX v14.3.2 0: Realtek, RTL2838UHIDIR, SN: 00000013 Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Found Rafael Micro R820T tuner Oversampling input by: 42x. Oversampling output by: 1x. Buffer size: 8.13ms Tuned to 162802000 Hz. Sampling at 1008000 Hz. Output at 24000 Hz. Exact sample rate is: 1008000.009613 Hz Tuner gain set to automatic. Signal caught, exiting! I don't have much idea what's going on, but I'm tempted to try opening it from a pipe (in C) to see if I can capture anything more. Alan ----- Radio Astronomy - the ultimate DX

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Re: Direct sampling mode and rtl_xxx
by Sdr Guru 31 Dec '12

31 Dec '12

On Mon, Dec 31, 2012 at 2:02 AM, Alan Corey <alancorey(a)yahoo.com> wrote: > Some of them have a -R option for raw, I think that's what it does (rtl_fm > anyway). > This is a different topic. raw = no demodulation About "Direct sampling mode" https://groups.google.com/forum/#!topic/ultra-cheap-sdr/cG988R1D8uE SG > > Any documentation on this set of programs would be a good thing, other > than looking in the code or using --help. > > Alan > > > ----- > Radio Astronomy - the ultimate DX > > ------------------------------ > *From:* Sdr Guru <sdrguru1(a)gmail.com> > *To:* osmocom-sdr(a)lists.osmocom.org > *Sent:* Sunday, December 30, 2012 5:39 PM > *Subject:* Direct sampling mode and rtl_xxx > > Hi > > Is it possible to use rtl_fm, rtl_sdr and rtl_tcp in "Direct sampling > mode" > > SDR Guru > > > >

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rtl-sdr over multicast & multiple decoders
by James Sharp 31 Dec '12

31 Dec '12

I've been playing around with rtl-sdr as a way to stream trunking radio and air band traffic. I've done a bit of research and found people who are using multiple dongles, one to digest the control channel and one or more to tune and receive the voice channels as the talk groups come and go. They're also using multiple dongles and/or squelch scanning to stream airband signals Around here, all of the channels of the trunking system as well as all of the "interesting" fit inside the bandwidth of a dongle running at 3.6Msps. So, my question is this: Would it not be more efficient to have a single tuner dongle outputting all of its samples over multicast (or into a shared memory segment for that matter, if you want to stay on the same host) and then having a bunch of decoder processes listening to the samples and decoding what they need out of them?

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Direct sampling mode and rtl_xxx
by Sdr Guru 30 Dec '12

30 Dec '12

Hi Is it possible to use rtl_fm, rtl_sdr and rtl_tcp in "Direct sampling mode" SDR Guru

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decode raw
by Vitaliy Kulchevych 21 Dec '12

21 Dec '12

Hi, all! I want parse and decode raw data from my sdr device. I have RTL2832 based DVB-T receiver. I want get data from receiver via rtl-sdr sotware, parse and decode, and sent completed data through websocket to client in browser. Where I can find description of returning data from rtl_sdr, rtl_tcp. Specs, docs? Or what is the best way to do something like this my idea? Thanks! -- live free or die;

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Exceptionally Hard & Soft Meeting,exploring the frontiers of open source and DIY,Berlin, December 28-30 2012
by Andrea Montefusco 21 Dec '12

21 Dec '12

Maybe I lost some previous message, but I don't remember to have already seen that here. Anyway... From http://ehsm.eu/index.html: Harald Welte will present the Osmocom project he founded. In particular, there will be OsmocomBB, a free software GSM stack evolved enough to actually make phone calls and send SMS (plus all the possible explorations of the GSM system), and OsmoSDR, a small-size, low-cost software defined radio device. *am* --------------------------------------------------------- Andrea Montefusco iw0hdv http://www.montefusco.com tel: +393356992791 fax: +390623318709 ---------------------------------------------------------

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Information about the sampling rate of the RTLSDR driver
by frederic.evennou＠orange.com 17 Dec '12

17 Dec '12

Hello, I am testing a DVB-T USB key including the Elonics E4000 chipset and I want to check the sampling rate of this card. I set up the sampling rate at 2.048 Ms/s (rtlsdr_set_sample_rate), and my storing buffer is 8*1024 bytes, so I expect receiving 1024 I/Q samples every 500 microseconds. I am using the rtlsdr_read_async function to read the samples. Unfortunately the loop in my program indicates that 8*1024 bytes are read every 2 milliseconds. I am using the gettimeofday function to measure the time in microseconds. Does this result mean that the best I can do is to read some samples every 2 ms at 2.048 Ms/s. This would mean that I am missing 1.5 ms of signal. Is that correct or I am doing something wrong ? Thanks for your help. Frederic _________________________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, France Telecom - Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. This message and its attachments may contain confidential or privileged information that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and delete this message and its attachments. As emails may be altered, France Telecom - Orange is not liable for messages that have been modified, changed or falsified. Thank you.

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Re: Update: New and improved airplane stuff
by Sdr Guru 16 Dec '12

16 Dec '12

On Fri, Dec 14, 2012 at 9:26 PM, Sdr Guru <sdrguru1(a)gmail.com> wrote: > On Tue, Dec 11, 2012 at 12:41 AM, keenerd <keenerd(a)gmail.com> wrote: > >> 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. >> >> > Hi Keener, > > nice work. > > Choosing between multiple devices (Windows7) is not working. > rtl_adsb.exe -d 1 > rtl_adsb.exe: invalid option -- d > > Thank you. It works now (Fedora). > I want to make a comparison between the E4000 and R820T. > > R820T produces 15% more packages than the E4000. Has anyone compared the rtl1090 and ADSB# ? http://sdrsharp.com/index.php/a-simple-and-cheap-ads-b-receiver-using-rtl-s… SDR Guru

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patch for rtl_tcp
by TAKAHASHI Tomohiro 14 Dec '12

14 Dec '12

Hi all, I'm new to this list. First, I want to say thank you to authors and contributors of this great work. I have set up a receiver server on Raspberry Pi with rtl_tcp, it seems it works good and can receive various signals with client gr-osmosdr on gnuradio or gqrx. But unfortunately I have encountered a trouble. I found rtl_tcp raise segv on reconnected from client. I investigated cause of segv and succeed to make a patch. Fixed rtl_tcp works good on raspberry pi(raspbian) and windows(mingw). I also make a startup script for debian/raspbian. I have push fixed code on github branch. https://github.com/edy555/rtl-sdr/tree/rtltcpFixSegv Please consider to pull this patch into original osmocom repo. Thanks, Tomohiro --- TT twitter: @edy555 blog: http://ttrftech.tumblr.com (in japanese)

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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

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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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osmocom-sdr December 2012