osmocom-sdr

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904 discussions

rtl_fm problem with capture audio
by Vitaliy Kulchevych 30 Nov '12

30 Nov '12

HI! I want grab audio from my sdr-device and convert it to h264. I use rtl_fm, check any options, but I can't listen any good sound :( For example: rtl_fm -f 10000000 -s 44100 - | mplayer - -quiet -rawaudio rate=8000:bitrate=44100 -demuxer rawaudio Can you help me? May be anybody know any software for me? Thank you! -- live free or die;

6 10

News from the OsmoSDR frontier
by Christian Daniel -- maintech GmbH 20 Nov '12

20 Nov '12

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everybody, since we found out that the Atmel SAM3U SSC interface is only capable of transporting 500ksps worth of I/Q data, we heard a lot of complaining because of the too narrow bandwith. Especially compared to the rtl-sdr with about 2msps, our 500ksps was bit contrained. The fact, that the OsmoSDR is much more sensitive to very small signals and brings a 14bit ADC instead of 8bits did not really compensate for the bandwidth loss. Also the mismatch between E4000 output resistance and ADC input brought some unwanted spectral effects. Instead of just releasing stuff, we decided to fix both issues: I now have a prototype with simple stack-on-board, that adds two op-amps to decouple the E4000 from the ADC and lower the impedance and also this board connecteds the available FPGA pins to the MCI (SD-Card) interface of the Atmel SAM3U. For this to get working, we had to rewrite major parts of the ARM firmware and the FPGA VHDL code. Today this work is completed and I can report success: The OsmoSDR now delivers up to 4msps at 14bits. Also the strange peaks around Niquist/zero frequency are gone. Find a screenshot of SDRangelove recording a DAB signal at 2msps (SDRangelove needs some more love until it can cope with 4msps in realtime - but we have verified that 4msps works without dropped samples using the builtin FPGA test mode). http://www.cdaniel.de/download/osmosdr-dab-2mhz.png We will now integrate the changes into the OsmoSDR mainboard and reroute the now free SSC pins to the pin headers instead of the MCI interface. Also we will add the opamps. For the already produced OsmoSDR boards, we will have more of the prototype stack-on-top-boards. We will keep you in the loop! Best regards, Christian PS: Regarding the DAB screenshot: - - The horizontal lines are correct - DAB uses a so called "pilot symbol", which only has energy on a few carriers. That's why it looks like a pause in the signal. - - The vertical line is also correct - DAB does not use the middle carrier to avoid I/Q offset problems on the transmitter side. - -- - --------------------------------------------------- | maintech # Dipl. Inf (FH) Christian Daniel | | GmbH ### Otto-Hahn-Str. 15 · D-97204 Höchberg | - --------------------------------------------------- | AG Würzburg, HRB 8790 Tax-ID DE242279645 | - --------------------------------------------------- | http://www.maintech.de cd(a)maintech.de | - --------------------------------------------------- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://www.enigmail.net/ iQEcBAEBAgAGBQJQfuMIAAoJEHkgzUIsAWriHA0IAI2Agg0vnjLFa5dDpxu9AAkq 6crr1Q/XAgrlmN8TY86yoYTMjJc7IZmjsAAGpidczZtSbwbmLFuTdQEo12dOvaZZ GvkvNttoDE2zsnbU50MzWDK5BUcbfOJoQahX26P+8hbiaIsFKT8Gl8Ao9c2vz79u e04Cl2SodmDDKnV84VL9i39+KZdkGcsbCWnFizqGzTbWyDkoSVviZORp20a3lCEZ g8Af73jwDgVAU4lfrK9gO10G5jibHkQeULNIXFH8NbDiUPSF2557fGsu/9yC1UUC msT0g41x8twb5nesT4ZtWDfQ3tUBgvLHn/ebv9xBxCX1Wg1W2FAFlcajbXx4zRQ= =Taca -----END PGP SIGNATURE-----

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LTE-Tracker
by James Peroulas 20 Nov '12

20 Nov '12

Hi! I just released a major update to the LTE code. There's a new program called LTE-Tracker that camps on a certain frequency and tracks, any LTE cells that it finds. Interesting features (all are in realtime): - You can see cells popping in and dropping off as the receiver is moved around the coverage area of the different cells. - You can see the actual transfer function of the wireless channel plotted on the screen. I've also made a small change to CellSearch so that now, it also displays the number of antennas (ports) on the basestation. Please let me know of any comments or suggestions! http://www.evrytania.com/lte-tools/lte-tracker James -- *Integrity is a binary state - either you have it or you don’t.* - John Doerr

3 5

R820T and Gnuradio
by Ron Senykoff 17 Nov '12

17 Nov '12

I have gnuradio running with the R820D DVB. Latest GQRX has the nice rf gain inside which REALLY helps. Has this been merged over to gr-osmosdr ? I recompiled probably just a few days, both from source. I'm trying to figure out how to set gain from within gnuradio (is there a argument I can pass the device in the source block?). I've been successfully decoding AFSK1200 APRS using gqrx and am trying to figure out how to set up an ultracheap iGate for APRS, maybe with gnuradio in the mix. Also using the OSMOSDR block I still see an LO like spike right in the middle. Here's my output starting GQRX. Interesting it's saying gr-osmosdr supported device types... ron@tripel:~$ startGqrx.sh ron@tripel:~$ gr-osmosdr supported device types: file fcd rtl rtl_tcp uhd >>> gr_fir_ccf: using 3DNow! >>> gr_fir_ccc: using 3DNow!Ext >>> gr_fir_fff: using 3DNow! gr-osmosdr supported device types: file fcd rtl rtl_tcp uhd Using device #0: Generic RTL2832U (e.g. hama nano) Found Rafael Micro R820T tuner TIA! -Ron / KB1UMH

2 2

rtl-fm yet another audio cature problem
by Olof Tangrot 17 Nov '12

17 Nov '12

Hi. I have tried (in a bash shell): rtl_fm -f 96.3e6 -s 48000 - | aplay -r raw -f dat -c 1 That was proposed somewhere as an example to listen to an FM station. But everything terminates with: aplay: main:576: bad speed value 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: 21x. Oversampling output by: 1x. Buffer size: 8.13ms Tuned to 96552000 Hz. Sampling at 1008000 Hz. Output at 48000 Hz. Exact sample rate is: 1008000.009613 Hz Tuner gain set to automatic. Signal caught, exiting! User cancel, exiting... I run Fedora 16 on a 64-bit AMD machine. aplay version is 1.0.26 If I break the command apart and generates a intermediate file it works but using a pipe does not. So is there some other shell that I where this might work or is there some better why to do this? Regards Olof

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Re: rtl_fm problem with capture audio
by keenerd 14 Nov '12

14 Nov '12

> Vitaliy Kulchevych coolchevy at gmail.com > Wed Nov 14 19:01:02 CET 2012 > > I want grab audio from my sdr-device and convert it to h264. > > I use rtl_fm, check any options, but I can't listen any good sound :( > > For example: rtl_fm -f 10000000 -s 44100 - | mplayer - -quiet > -rawaudio rate=8000:bitrate=44100 -demuxer rawaudio My apologies for breaking threading on this message - just signed up to the ML today. I can't help you without a lot more information. Is this a narrow band or a wide band FM signal? Do you want to save the audio to a file or a network stream? What operating system are you using? Why are you trying to compress an audio stream with a video codec? -Kyle http://kmkeen.com

2 1

Compilation issue
by Leonardo Lazzaro 13 Nov '12

13 Nov '12

Hi! I was trying to compile the osmocom sdr project and also trying to report a compilation error. I will like to have an account to contribute. this was the error I got: In file included from /home/llazzaro/tmp/gr-osmosdr/lib/osmosdr_source_c_impl.h:23:0, from /home/llazzaro/tmp/gr-osmosdr/lib/osmosdr_source_c_impl.cc:30: /home/llazzaro/tmp/gr-osmosdr/include/osmosdr/osmosdr_source_c.h: In constructor ‘osmosdr_source_c::osmosdr_source_c()’: /home/llazzaro/tmp/gr-osmosdr/include/osmosdr/osmosdr_source_c.h:57:19: error: no matching function for call to ‘gr_hier_block2::gr_hier_block2()’ /home/llazzaro/tmp/gr-osmosdr/include/osmosdr/osmosdr_source_c.h:57:19: note: candidates are: /usr/include/gnuradio/gr_hier_block2.h:57:3: note: gr_hier_block2::gr_hier_block2(const string&, gr_io_signature_sptr, gr_io_signature_sptr) /usr/include/gnuradio/gr_hier_block2.h:57:3: note: candidate expects 3 arguments, 0 provided /usr/include/gnuradio/gr_hier_block2.h:43:7: note: gr_hier_block2::gr_hier_block2(const gr_hier_block2&) /usr/include/gnuradio/gr_hier_block2.h:43:7: note: candidate expects 1 argument, 0 provided /home/llazzaro/tmp/gr-osmosdr/lib/osmosdr_source_c_impl.cc: In constructor ‘osmosdr_source_c_impl::osmosdr_source_c_impl(const string&)’: /home/llazzaro/tmp/gr-osmosdr/lib/osmosdr_source_c_impl.cc:83:35: note: synthesized method ‘osmosdr_source_c::osmosdr_source_c()’ first required here make[2]: *** [lib/CMakeFiles/gnuradio-osmosdr.dir/osmosdr_source_c_impl.cc.o] Error 1 make[1]: *** [lib/CMakeFiles/gnuradio-osmosdr.dir/all] Error 2 make: *** [all] Error 2 -- http://www.lazzaroleonardo.com.ar/ twitter @llazzaro

2 4

E4000 undocumented registers?
by Adam Nielsen 11 Nov '12

11 Nov '12

Hi all, I've been looking at the E4000 tuner code and I have a couple of questions that aren't answered in the datasheet. I'm hoping someone here might have some insight. In the Elonics-supplied code[1] when setting the frequency (around line 1339), they always write a 1 into register 0x07 (Synth1), which is the "PLL locked" register. Does this affect anything? The datasheet says it's read only and librtlsdr only ever reads this value, it never writes to it. Then, beginning at 82.9MHz and continuing at every multiple of 28.8MHz above this, the first 7MHz is tuned differently, but the rest of the 21.8MHz in that "channel" is set normally. This stops between 233.9MHz and 485.6MHz, then resumes again at 8MHz increments instead of 7MHz up until 868MHz. When tuned differently, register 0x05 (Input clock) gets set to 3, which isn't listed in the datasheet (and also says 'do not write to this register'). Mostly (but not always) when this happens (i.e. first 7-8MHz of the channel), register 0x07 bits 3-4 are also set to various arbitrary values. The datasheet says 0 means "16-32MHz input clock freq range" but this code writes 1 and 2 into this field as well. It seems to write approximately these values: 1 up to 89.9MHz 0 up to 118.7MHz 1 up to 205.1MHz 2 up to 233.9MHz 0 up to 551.2MHz 1 up to 752.8MHz 2 up to 868MHz 0 after 868MHz After the first 7-8MHz the rest of the 28.8MHz channel has the default 0 value set. Does anyone know what these values control? As a side note, register 0x08 (Synth2) appears to do something even though it's listed as reserved. By setting particular bits I can get the rtl_test program to not lock on to any frequency, but oddly enough rtl_fm still works fine. I'm not sure what to make of this yet. I don't suppose this register is documented anywhere else? I'm just wondering whether the datasheets supplied by Elonics are different to the one that is now public. Thanks, Adam. [1]: One of many copies is at https://github.com/mbarbon/rtl2832/blob/master/tuners/tuner_e4000.c

1 0

removing the L-band gap on E4000
by Jacek Lipkowski 08 Nov '12

08 Nov '12

Hello I've tried to remove the L-band gap on my E4000 tuner by changing the divisors. Please see the patch below. I don't have a signal source to test today, so i'm not sure if it works, but the pll locks. I will try to test tomorrow. Without my hack: E4K L-band gap: 1093 to 1233 MHz With my hack: sq5bpf@dellix:~/gnuradio/rtl-sdr/src$ ./rtl_test -t 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 Benchmarking E4000 PLL... [E4K] PLL not locked for 51000000 Hz! [E4K] PLL not locked for 2186000000 Hz! E4K range: 52 to 2185 MHz E4K L-band gap: 0 to 0 MHz Regards Jacek / SQ5BPF --- tuner_e4k.c.orig 2012-11-08 22:08:07.000000000 +0100 +++ tuner_e4k.c 2012-11-08 23:01:05.000000000 +0100 @@ -35,6 +35,7 @@ /* If this is defined, the limits are somewhat relaxed compared to what the * vendor claims is possible */ #define OUT_OF_SPEC +#define HACKED_DIVISORS #define MHZ(x) ((x)*1000*1000) #define KHZ(x) ((x)*1000) @@ -357,7 +358,14 @@ {KHZ(350000), (1 << 3) | 1, 8}, {KHZ(432000), (0 << 3) | 3, 8}, {KHZ(667000), (0 << 3) | 2, 6}, - {KHZ(1200000), (0 << 3) | 1, 4} +#ifdef HACKED_DIVISORS +/* the original settings seem to be ripped from some Elonics driver, + * however changing them a bit removes the L-band gap + * change this to a bit more then the end of your L-band gap --sq5bpf */ + {KHZ(1270000), (0 << 3) | 1, 3} +#else + {KHZ(1200000), (0 << 3) | 1, 4} +#endif }; static int is_fvco_valid(uint32_t fvco_z)

2 2

RTL-SDR with MSI DIGIVOX Micro HD support
by Höss Lajos 07 Nov '12

07 Nov '12

Hi, Good news with MSI DIGIVOX Micro HD (1d19:1104) DVB-T tuner. Now the tuner working. Succesfully received analague UHF TV sound channel 80 kilometer distance from transmitter, taxi driver (164 Mhz) and one frequency from 70cm radio amateur band. The tuner is FCI FC2580 from debug message. I see on http://sdr.osmocom.org/trac/wiki/rtl-sdr great new info for this tuner 146 - 308 MHz and 438 - 924 MHz (gap in between). Not have any wideband generator for check this, but for example with strong local FM radio station 87.5-108MHz tunable, but received only noise. I think the frequency range possibly same. All rtl-sdr DVB-T tuner with fc2850 has a same frequency range? I interesting for not working frequiency, working frequiency or working freq. but poor receiver quality, or any gap. I interesting also for 2 meter radio amateur band, only max. 2 MHz lower. 144-146MHZ only noise received, i not know my antenna bad, or this is not possible. mngc

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