osmocom-sdr

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906 discussions

Debian Jessie and kernel 3.9.1
by Anton Komarov 25 Aug '13

25 Aug '13

Tested several rtl dongles with linux 3.9.1 on Debian Jessie (testing) and got disappointing results 2 dongles simultaneously working ok if using 3 or more than 3rd dongle not working (1st and 2nd working ok) in Debian Wheezy i did manage to run 5 dongles simultaneously (kernel 3.2) i suppose developers should pay attention to than fact. -- public PGP key http://pastebin.com/dqZqgyVE

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Proposal: Java wrapping of .dll/.so
by Alessandro Staniscia 20 Aug '13

20 Aug '13

Hi ml users, I'm a newbie of this ml and this is my first message. So, just a little presentation of me: I'm a Software analyst and I work full time with java and some time in C++. I was a linux user on my beautiful but defunct linux laptop! Now (almost 15 days) I'm a linux user on windows laptop. Into the company, java is a solution to write a Crossplatform service and software. In my free time I have used various tools based of rtlsdr library, and I found very difficult to retrieve alternative of all linux-based software! So, if I would write java program, does exist a java wrapping of rtlsdr library? In your opinion, building a wrapper of the library is a stupid or a good feature? IMHO many software ( parser/plotter/networktool) are written in java and this is a opportunity for the library to retrieve this knowhow. What do you think?

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Problems compiling rtl-sdr on debian
by lee jones 20 Aug '13

20 Aug '13

Hello all! Just been trying to compile rtl-sdr ( http://sdr.osmocom.org/trac/wiki/rtl-sdr ) on my linux box but I'm having a few problems. Btw the linux distro is debian running a 64-bit kernel; 3.10-1-amd64. Here's the problem. I can't seem to get rtl-sdr to compile quite right either with the cmake or autotools instructions from the sdr website. I've tried both methods; only one completes (but produces an unstable version) the other version dosen't compile at all. Here's the output I get from trying to build by using cmake - http://slothpuck.no-ip.org/tmp/cmake-build.txt and then with autotools method - http://slothpuck.no-ip.org/tmp/autoconf-build.txt I get a lot of errors with the cmake method with lots of warnings about unused paramaters; the autotools method dosen't even complete. The cmake version does however but appears to be very unstable. If I try to run one of the programs made by rtl-sdr -- the program rtl_tcp with another program such as gqrx, .e.g by starting rtl_tcp in a terminal then run gqrx in another ( http://www.oz9aec.net/index.php/gnu-radio/gqrx-sdr ) I find it causes rtl_tcp to crash - either with a segfault, or with a "worker cond timeout, signal caught exiting!" message (rtl_tcp hung in this case). I do have libusb (both library and dev) and gnuradio installed btw. any thoughts on what might be going wrong at all? Thanks ljones

4 11

Is My RTL2838U + R820T Tuner working?
by Curt Carpenter 20 Aug '13

20 Aug '13

Just to close the loop... Thanks to Skip's link to rtl_fm here on the list, I've finally managed to get my dongle working, and am happily listening to my local FM station on my computer now :-) And now that I'm sure my hardware is working, I can start to explore the osmocom software seriously. Thanks for the help!

1 0

Re: How RTL-SDR samples signals
by David Basden 20 Aug '13

20 Aug '13

Hmmm. You're right. My bad; I confused it with (I suspect) the E4000 VCO, and it really doesn't make sense given the wider channel bandwidth of a DVB signal. At 8 bits, 225 Msps isn't going to fit down USB2 though :( On Mon, Aug 19, 2013 at 08:47:20PM -0700, jdow wrote: > That doesn't necessarily square with "7-bit ADC for RF signals level > measurement". It's unclear to me where it would get the signal with > enough levels that a 7-bit ADC would get used. You'd have to decimate > down to 225 Msps or so in order to get 7 bits of data. > > {^_^} Joanne/W6MKU > > On 2013/08/19 20:17, David Basden wrote: > >The RTL2382U has an ADC onboard; The dongles don't use a seperate > >ADC. The main other component is the tuner. > > > >The RTL2382U uses a sigma-delta ADC, so it samples at a much higher > >rate than it needs, but only at 1 bit. It then trades the high > >sample rate for higher dynamic range. (Think reverse PWM, although > >that is a huge oversimplification). > > > > > >http://www.maximintegrated.com/app-notes/index.mvp/id/1870 > > > >The crystal is to drive the clock of the RTL2832U. It's almost certainly > >running a single 1 bit sample per clock. > > > >If you were to get the samples at the 28.8Msps rate, they would be 1 bit > >samples, which you would still have to filter and downsample for most > >uses. I'm not aware of any way to get the samples out at that rate. > > > >David > > > >On Mon, Aug 19, 2013 at 11:44:51PM -0300, Lucas Ingles wrote: > >>Hello to all, > >> > >>Please, can someone help me to understand how RTL2832U samples signals? > >>I know it has two ADCs, one for the I (in-phase) component and other ADC > >>for the Q (quadrature) component. > >> > >>In http://superkuh.com/rtlsdr.html the author states the signal is sampled > >>initially at 28.8 Msps and then re sampled to present whatever sample rate > >>is desired. > >> > >>But > >>http://www.realtek.com.tw/products/productsView.aspx?Langid=1&PFid=35&Level… > >>says > >>that 28.8MHz is the frequency of the crystal, not the ADC. > >> > >>I am confused with that, can someone help me? > >>If RTL2832U is able to sample at 28.8Msps, why don't use the maximum sample > >>rate? Maybe USB limitations? > >> > >>Also, all ADCs used in RTL-SDR dongles are inside RTL2832U? Or we have > >>external ADCs? > >> > >>Thanks very much in advance, > >>Lucas Ingles > >

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How RTL-SDR samples signals
by Lucas Ingles 20 Aug '13

20 Aug '13

Hello to all, Please, can someone help me to understand how RTL2832U samples signals? I know it has two ADCs, one for the I (in-phase) component and other ADC for the Q (quadrature) component. In http://superkuh.com/rtlsdr.html the author states the signal is sampled initially at 28.8 Msps and then re sampled to present whatever sample rate is desired. But http://www.realtek.com.tw/products/productsView.aspx?Langid=1&PFid=35&Level… says that 28.8MHz is the frequency of the crystal, not the ADC. I am confused with that, can someone help me? If RTL2832U is able to sample at 28.8Msps, why don't use the maximum sample rate? Maybe USB limitations? Also, all ADCs used in RTL-SDR dongles are inside RTL2832U? Or we have external ADCs? Thanks very much in advance, Lucas Ingles

2 1

Is My RTL2838U + R820T Tuner working?
by Curt Carpenter 20 Aug '13

20 Aug '13

Hello! I received my USB-DVB-T+DAB+FM dongle last week, and have been trying to find a signal with it since, but with no luck. Can anyone tell me how to tell if it is working at all? I'm using the Windows version of Osmocom under WinXP. Using rtl_eeprom, I get the following display: -------------------------- Vendor ID 0x0bda Product ID 0x2838 Manufacturer Realtek Product RTL2838UHIDIR Serial Number 00000000001 Serial Number Enabled Yes IR Endpoint Enabled Yes Remote Wakeup Enabled No ----------------------- When I run rtl_test -s 1.6e6 I get the following response: ----------------------- 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 Supported gain values(29): 0.0 0.9 .... 49.6 Info: This tool will continuously read from the device, and report if samples get lost. If you observer no further output, everything is fine. Reading samples in async mode... -------------------------- If at that point after a while I press Control C, I get --------------------------- Signal caught, exiting! --------------------------- But then my command prompt window hangs up and will do nothing until I close it all together. Does it appear that my dongle is working? Where do I find out how to use the different gains that are listed by rtl_test? Could my difficulties have anything to do with the fact that my dongle is IR Endpoint enabled? I am brand new to this, and haven't had much luck so far, although I think I've gotten further with Osmocom and Windows than with anything else I've tried. Any help/advice/links to more information will be much appreciated. Sorry for the long post -- I was trying to provide as much information as I could. Thanks Curt Carpenter

2 2

OpenBSD: crashing
by Alan Corey 18 Aug '13

18 Aug '13

This is with a version of rtl-sdr I got by git last night and OpenBSD 5.2 (current release). 5.2 has some pthreads fixing so I waited until I bought another computer and loaded it. Are the crashes related to threads? I don't know, but possibly. It didn't work with OpenBSD 5.0 either. rtl_fm crashes and uses threads rtl_adsb crashes and uses threads rtl_tcp doesn't crash, uses threads, actually stops on ctrl-c rtl_test doesn't crash, doesn't use threads, won't stop rtl_eeprom doesn't crash, doesn't use threads, ends normally I'm not real practiced using gdb but I tried looking at a couple of core files, here's a run of rtl_fm: rtl_fm -f 162550000 -N - | play -t raw -r 24k -e signed-integer -b 16 -c 1 -V1 - -: (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 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 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. In:0.00% 00:00:00.00 [00:00:00.00] Out:0 [ | ] Clip:0 Done. Abort (core dumped) d530# gdb -c rtl_fm.core /usr/local/bin/rtl_fm GNU gdb 6.3 Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-unknown-openbsd5.2"... Core was generated by `rtl_fm'. Program terminated with signal 6, Aborted. Reading symbols from /usr/lib/libpthread.so.16.0...done. Loaded symbols for /usr/lib/libpthread.so.16.0 Reading symbols from /usr/lib/libm.so.7.0...done. Loaded symbols for /usr/lib/libm.so.7.0 Reading symbols from /usr/local/lib/librtlsdr.so.0.0...done. Loaded symbols for /usr/local/lib/librtlsdr.so.0.0 Reading symbols from /usr/local/lib/libusb-1.0.so.1.0...done. Loaded symbols for /usr/local/lib/libusb-1.0.so.1.0 Symbols already loaded for /usr/lib/libpthread.so.16.0 Reading symbols from /usr/lib/libc.so.65.0...done. Loaded symbols for /usr/lib/libc.so.65.0 Loaded symbols for /usr/libexec/ld.so #0 0x0abbd98d in kill () from /usr/lib/libc.so.65.0 (gdb) bt #0 0x0abbd98d in kill () from /usr/lib/libc.so.65.0 #1 0x0ac29545 in abort () at /usr/src/lib/libc/stdlib/abort.c:68 #2 0x005e9298 in pthread_mutex_unlock (mutexp=0x3c003d8c) at /usr/src/lib/librthread/rthread_sync.c:218 #3 0x1c00266e in full_demod (fm=0xcfa2de5c) at /usr/src/misc/osmocom/2013-04-15/rtl-sdr/src/rtl_fm.c:583 #4 0x1c0028ff in demod_thread_fn (arg=0xcfa2de5c) at /usr/src/misc/osmocom/2013-04-15/rtl-sdr/src/rtl_fm.c:641 #5 0x005ebc2e in _rthread_start (v=0x84da4c00) at /usr/src/lib/librthread/rthread.c:111 #6 0x0aba62e9 in __tfork_thread () from /usr/lib/libc.so.65.0 The backtrace (bt) shows that it dies trying to do a mutex_unlock (I think). rtl_tcp also does a mutex_unlock and it doesn't crash. I'm probably reading it wrong for all I know. I don't know what's causing the signal 6 either. I'd also like to get the -lrt of of the cmake files. OpenBSD doesn't use or have lrt, it works without. I can edit it out and compile, but every time I run cmake again, I have to edit the files again. Alan ----- Radio Astronomy - the ultimate DX

5 10

Fwd: Need a starting point to learn RTL-SDR
by Andrew Mount 11 Aug '13

11 Aug '13

---------- Forwarded message ---------- From: *Andrew Mount* Date: Friday, August 9, 2013 Subject: Need a starting point to learn RTL-SDR To: Andrew Back <andrew(a)carrierdetect.com>, " osmocom-sdr-request(a)lists.osmocom.org" < osmocom-sdr-request(a)lists.osmocom.org> Andrew, Thank you. I have two radio astronomy projects in mind. The first is a HF system that will enable me to pick or zoom into a narrow band of frequencies , say 20-22 mHZ from a larger 18 - 26 mHZ range ( currently scanned by a spectrograph) to study N type storm events from Jupiter. This will require coding on my part as I have to interface with pre-existing software in order to load data accepted by the NASA RADIO JOVE archive. The other application ( much easier) is to build an RTL based 220 mHZ range meteor scatter detection system. The meteor detection system is the current project. I have the computer, the RTL and am waiting on the antenna, ( due to arrive by 30 August). This has already been worked out software wise, it is a plug and chug type of project. The advantage is that I can be collecting meteor data by the end of the year and I will learn about RTL SDR in the process. In order to build my own custom SDR system, what is needed is knowledge of a more how to -and what is- type. I need to learn the technical language, what programs to use, how an RTL works, integration with a build ( i have access to Matlab? ) environment, how to write drivers, etc. I need to know how it works, how to speak the language and what are the prerequisite tools to get the job done. Any suggestions that would build proficiency in these areas would be invaluable for me. Thanks for responding so quickly and best wishes, Andy On Friday, August 9, 2013, Andrew Back wrote: > On 9 August 2013 13:03, Andrew Mount <capeorion(a)gmail.com> wrote: > > Are there any good books or Internet references that the listserv members > > could recommend as a starting point ? > > > > I am an amateur astronomer who is interested in learning how to use > RTL-SDR > > to do radio astronomy. > > The top Google result looks promising: > > http://www.rtl-sdr.com/rtl-sdr-for-budget-radio-astronomy/ > > Regards, > > Andrew > > -- > Andrew Back > http://carrierdetect.com >

3 2

Need a starting point to learn RTL-SDR
by Andrew Mount 09 Aug '13

09 Aug '13

Are there any good books or Internet references that the listserv members could recommend as a starting point ? I am an amateur astronomer who is interested in learning how to use RTL-SDR to do radio astronomy. Thank you, Andy Mount

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