osmocom-sdr

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904 discussions

Windows driver for RTL283 device
by Robert Durkacz 22 Jan '13

22 Jan '13

Hello, I am using cygwin with Windows XP but I do not have a good understanding of the Windows OS. I could do with some advice about how the usb driver for the RTL2832U device is meant to be located by the rtl_sdr.c program using the libusb library. For me this program fails with a libusb_open() error of -12. Using the debugger I can see this is due to no driver being found for the RTL2832U device. When the function get_api_type() in windows_usb.c is called it consults the registry for a driver name for the device. In my case it finds RTL2832UUSB and RTL2832UBDA but I suppose this just depends on what is sitting in the registry. Subsequently the program checks to see if the driver name is WINUSB or USBCCGP. Because it is not the program cannot work. Am I meant to ensure either WINUSB or USBGCCP drivers are installed on my computer and must the registry entry for the RTL2832U device point to one of these? If so, is there a recommended procedure to do that? Thanks for any advice Robert Durkacz

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Re: Getting Started...
by Sylvain Munaut 22 Jan '13

22 Jan '13

Hi, You should know that the fw is being rewritten ( branch mci-rewrite ), to use the MCI interface for data transfer, allowing up to 4 MHz transfer. But this will require a HW mod to be detailled later. Cheers, Sylvain

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segmentation fault on Ubuntu 12.04
by Peter A. Bigot 21 Jan '13

21 Jan '13

As a new user of GNU radio with a couple RTL2832 dongles to play with I used the build-gnuradio script to install on Fedora 16 and Ubuntu 12.04. The Fedora install worked fine; but the Ubuntu one produced this: lemur4[18]$ rtl_test 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 Supported gain values (14): -1.0 1.5 4.0 6.5 9.0 11.5 14.0 16.5 19.0 21.5 24.0 29.0 34.0 42.0 Reading samples in async mode... cb transfer status: 1, canceling... Library error 0, exiting... Segmentation fault (core dumped) The traceback showed the fault to occur in libusb1, and seemed similar to the issue discussed at http://lists.gnumonks.org/pipermail/osmocom-sdr/2012-August/000201.html I noticed this patch at the head of master touched the same general part of the code. commit 3cbf1392612a0c6f02ec178f8e78568138f12b0a Author: Hoernchen <la(a)tfc-server.de> Date: Wed Jan 16 20:03:00 2013 +0100 exit if our usb device disappears Reverting this change fixed the issue. Peter

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installing rtl-sdr and whether I need to reinstall gnuradio
by Mike Sousa 17 Jan '13

17 Jan '13

Hi, In reading the directions for rtl-sdr installation, I'm curious if following line in the Software section (http://sdr.osmocom.org/trac/wiki/rtl-sdr#Softwarer): "Please note: prior pulling a new version from git and compiling it, please do a "make uninstall" first to properly remove the previous version" means to uninstall my gnuradio installation, or if I have one, just the rtl-sdr software? I don't have any rtl-sdr software installed yet, but I do have a recent gnuradio installed (v3.6.?) on Ubuntu 12.10. Thanks for your help. '73' Mike, KB1QVO

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Re: rtl-sdr and gr-osmosdr
by Jonathan Guthrie 13 Jan '13

13 Jan '13

Sir: If you look in the place where you built gr-osmosdr, you will find a file called install_manifest.txt which contains where it put all the files. The rtlsdr_source_c.xml and osmosdr_source_c.xml (which are files that describe the sources, both of which produce streams of complex numbers, which is what the naming convention means) are how the gnuradio companion knows how to use those sources. Do a "sudo make uninstall" where you built gr-osmosdr, and then start over with gr-osmosdr. But this time, instead of just running "cmake" with no options, use the command: cmake .. -DCMAKE_INSTALL_PREFIX=/usr You "define" (that's what "-D" means) the value "CMAKE_INSTALL_PREFIX" to be /usr. If you don't define it to be something, it will use the default value of "/usr/local" I have a Web page with partial instructions (it's not intended to be a Linux introduction, although I will do my best to answer specific questions if you have any) and some other stuff on it: http://www.ka8kpn.org/sdr-dongle.html Oh, and while I'm thinking about it, I really detest mailing lists whose default action on a reply is to write directly to the person to whom you are responding rather than to the list. To me, it is optimizing the atypical case and it makes far more sense to optimize for what everyone nearly always wants to do. That is, it may be technically correct, but it is definitely the wrong thing to do. However, I know I've lost that battle, so I'll not mention it again. On 01/12/2013 03:24 PM, tokens(a)myranch.com wrote: > Hi Jonathan, > > Please excuse my ignorant comments and questions but I am very much a > Linux novice. > > I see that there are directories for gr-osmosdr, rtl-sdr, and uhd > under home directory. Under usr/local/share/gnuradio/grc/blocks/ I > find osmosdr_source_c.xml and rtlsdr_source_c.xml. Directories for > gnuradio are under usr/etc and usr/include. I guess this is what you > mean by some bits of gr-osmosdr and rtlsdr end up in usr/local. How do > I force cmake to install the software into /usr. > > Thank you very much. > > Regards, > Al > > -----Original Message----- From: Jonathan Guthrie > Sent: Saturday, January 12, 2013 2:18 PM > To: tokens(a)myranch.com > Subject: Re: rtl-sdr and gr-osmosdr > > On 01/12/2013 09:03 AM, tokens(a)myranch.com wrote: >> I have installed these using the procedures shown in the wiki. I >> didn’t see any errors during the installation. The packages are on >> the computer but they are not listed amongst the sources on GNU Radio >> Companion. >> If I type in the terminal rtl_test –t I get: >> 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 >> usb_open error -3 >> Failed to open rtlsdr device #0 >> >> Any suggestions? >> > > I installed GNURadio as packaged by my distribution, and I did the > "cmake; make; sudo make install" that I found, and I got the symptoms > you described. The problem I had is that packaged software normally > gets installed into /usr and the "cmake, etc" procedure installs it's > software into /usr/local. That meant that grc was looking in the wrong > place to find the gr-osmosdr bits. > > Telling cmake to install the software into /usr fixed my problem. Could > it possibly fix yours? > >

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rtl-sdr and gr-osmosdr
by tokens＠myranch.com 12 Jan '13

12 Jan '13

Using Sudo, as suggested by two readers, takes care of the rtl_test problem. However, I still don’t have the OsmoSDR and RTLSDR source blocks appearing in GNU Radio Companion. Thank you. Al

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Plane plotting software for unix?
by Alan Corey 06 Jan '13

06 Jan '13

I like adsbScope under Windows, but is there anything similar for unix? Hopefully something free that takes a tcp feed. Alan ----- Radio Astronomy - the ultimate DX

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gr-osmosdr frequency range for rtlsdr
by Alexandru Csete 02 Jan '13

02 Jan '13

Greetings, I noticed today that rtl_source_c::get_freq_range() returns an empty range for all but E4000 tuners. Is it due to lack of information? I have dongles with R820T and FCI2580 tuners that I can measure the usable ranges for if needed. Alex

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Why is there Sleep() in rtl_fm?
by Alan Corey 02 Jan '13

02 Jan '13

Is this from Windows or something? In unix it's sleep, not Sleep, and it only takes ints or something similar. I have a native (OpenBSD) usleep so I ifdefed: #ifdef _WIN32 #define usleep(x) Sleep(x/1000) #endif It didn't affect my problem but it made me feel better. Alan ----- Radio Astronomy - the ultimate DX

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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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