osmocom-sdr

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904 discussions

Rtl-Sdr
by Peter Hoffmann 26 Mar '12

26 Mar '12

Hy, I just stumbled over the rtl-sdr without any prior knowledge about srd or the osmocom-project. I'm sorry if this hole project is just not for newbies but I wanted to at least ask for help. I planing to use the Noxon DVB USB Stick as an sdr to listen to our baby monitor and extend it's radius this way. My first step is to listen to a fm radio station by collecting some I/Q on the stations frequency. But neither the I/Q nor the cfile I created using the gnu-radio companion results in data I can listen to sending it to /dev/audio. I assume, I'm making some major mistakes so I want to ask for some hints or reading advice (some M to RTFM ;-) Thank you, Hoffmann P

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RTL-SDR software
by Michał Rogala 23 Mar '12

23 Mar '12

Hi! A have a question regarding current development status of RTL-SDR project - does someone develop any additional tools than those available on osmocom git? Actually I'm developing ExtIO DLL library to connect various SDR software (ie. Winrad, HDSDR, etc) with RTL-SDR dongles. I'm asking because I don't want to duplicate someone's else work. best regards Michal Rogala

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Status Update
by Christian Daniel -- maintech GmbH 22 Mar '12

22 Mar '12

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi everybody, after a few weeks of apparent silence I'm here to report the current status of the OsmoSDR stick. I know that a bit more reporting and general traffic on the list would be good for the project, but please be patient with us since this project runs in all our spare time - and there is not much of that... I have to admit that the advent of the rtl-sdr is bit a kick into the stomach, but I fear that the problem lies with us and our slow progress. However I can only stress that the OsmoSDR will be more flexible, powerful, programmable (even stand-alone operation is possible!) and sensitive. Many of you don't care much about sensitivity, but you will notice the difference when you see it... But now to the facts: - - the OsmoSDR revision 2 review is completed and the PCBs are ordered - - depending on the workload of the PCB shop, we have to wait ten to 15 working days for the PCBs to ship to Stefan Reimann (DG8FAC) - - he will assemble 20 boards immediately (machine time is booked) - - after that we will tests and checks that no fatal bug remains - - after that the rest are assembled - - we will have about 100 boards then (most probably a few will need some rework as soldering is not a 100% process) For the revision 2 we changed the following things: - - clock output of the Si570 was reworked the mitigate voltage level problems on the E4000 input - - a lowpass in to E4000 input was added to kill harmonics from the Si570 (the Si570 produces a square wave signal) - - a ~20dB LNA was added to increase sensitivity to -125dB @ 450 MHz (at least we hope so :) - - a lowpass at the antenna input was added to avoid driving 100mW into the E4000 when a WLAN near to the stick goes on TX - - serial wire debugging for the SAM3U was added - - a few lines at the FPGA were rerouted - - LEDs moved to the border of the board - - the board was shrunk 1mm to fit into a casing - - the expansion pins were moved to fit into the 2.54mm grid (a breadboard should fit neatly on top) During the sensitivity tests I did two weeks ago I saw that the RX spectrum is pretty clean and the RX filters in the E4000 are really good. So - even with a few weeks delay - we can finally look forward to get our hands at the OsmoSDR and we will have a really good receiver at our hands! Cherio! Christian - -- - --------------------------------------------------- | 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://enigmail.mozdev.org/ iQEcBAEBAgAGBQJPaLNtAAoJEHkgzUIsAWrihOMIAIunTXO47hk4fcUxLjaj/mB3 24vBjxqpbnHWGgG35bLAjTICkpg0sZEgxppl3w7nKR1vzyoCVl2qdXfuFhrml/WP mREjLTjtYZB2o1snDKmyoV7jnvHlXKql4AbMnNz2XAlQ0kgDw+BLJf1CNvHpTeNK 6c0WA7XzVEZVYHiCBI8hDWl1/WUK2JLRdmJ7sFrINO40kn5ka5trUDDfCaAr/fAR +0rD0Fhqm3R7tOHmC9e4PWwslY1pGYB2pbcCbICHgEWlQQRSGxdSCzkEL0/STcuI rHuLTpfSrHkbn/TtHaIuVvfraAq8fRARiVqoMooIK0+h8bxfFiHxbHznuh33moY= =zTDS -----END PGP SIGNATURE-----

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FC0012 tuner
by Mathias Coinchon 19 Mar '12

19 Mar '12

Hi, The rtl-sdr is really great ! Congratulation and thank you for your work ! This really democratises the SDR to anyone with so low prices. I have an ezcap ez646 USB stick, based on rtl2832u but this one has a FC0012 tuner chip. I wondered if some of you had information or clues about this tuner as you have developped the driver for the FC0013. Then I could attempt to adapt the code for this stick. Regards Mathias Coinchon opendigitalradio.org

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Re: OsmoSDR sensitivity
by Dieter Spaar 06 Mar '12

06 Mar '12

Hello Christian, On Tue, 06 Mar 2012 17:49:02 +0100, "Christian Daniel -- maintech GmbH" <cd(a)maintech.de> wrote: > > The RX is not a sensitivity-wonder. Perhaps a preamp? I have to correct my previous posting, the Funcube has an LNA between antenna and the E4000 so the sensitivity numbers are not comparable. But maybe it is possible to use a similar circuit. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Re: OsmoSDR sensitivity
by Dieter Spaar 06 Mar '12

06 Mar '12

Hello Christian, On Tue, 06 Mar 2012 18:59:35 +0100, "Christian Daniel -- maintech GmbH" <cd(a)maintech.de> wrote: > > your package is still laying here... sorry... :((((((( (head -> desk) No problem, thats why I have looked for this USD 20 device ;-) Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Re: OsmoSDR sensitivity
by Dieter Spaar 06 Mar '12

06 Mar '12

Hello Christian, On Tue, 06 Mar 2012 17:49:02 +0100, "Christian Daniel -- maintech GmbH" <cd(a)maintech.de> wrote: > > The RX is not a sensitivity-wonder. Perhaps a preamp? According to the Funcube Technical FAQ: Each unit is tested for 0.15uV for 12dB SINAD NBFM at 145MHz and 435MHz I am not 100% sure how to compare this number with your results but this seems to be (much) better (if my quick calculation wasn't totally wrong). Also from my very short and quick experience with a DVB-T Stick based on an E4000 and RTL2832U, the sensitivity is quite good (I only tried DAB/FM/DVB-T so far with a very bad antenna inside a building). BTW, according to a newsgroup post this device also offers some sort of raw mode with around 2 MHz sample rate for 8-bit I/Q values. Not that bad for USD 20 including shipping ;-) Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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OsmoSDR sensitivity
by Christian Daniel -- maintech GmbH 06 Mar '12

06 Mar '12

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi guys, I measured the sensitivity of our OsmoSDR. For that I did the following commands: tuner.init! tuner.freq=465000000 tuner.dc_calib! tuner.dc_table! tuner.gain=6,9,9,2,15,15 tuner.iqofs=43,27,0,0 I did the measurements on no-so-even frequencies to avoid any lines in the sprectrum. I increased the power from my signal generator until a SNR of 10dB as achieved. The RX was tuned 100kHz lower than the TX signal and the I/Q offset was calibrated before every measurement. 65.2MHz: -99dBm 145.2MHz: -102dBm 435.2MHz: -104dBm 945.2MHz: -85dBm 1300.2MHz: -89dBm 1500.2MHz: -89dBm 1800.2MHz: -84dBm Also please note that we have a hole at 1200 MHz - there are no valid PLL settings here. The RX is not a sensitivity-wonder. Perhaps a preamp? Best regards, Christian - -- - --------------------------------------------------- | 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://enigmail.mozdev.org/ iQEcBAEBAgAGBQJPVj/4AAoJEHkgzUIsAWripiAIAJ00dqh1/0MEehEdQrqtN4Ox dRHJrKSv1o+2I3HlAGLXCeAYXenaML1+hrmjZfoOCz9yYDabMD65/DVplU5lnvHT nkXEkJCdkdwOL2vieb1QD0aUmgRmjH1OugOS8DotjtmtGI4Wd/nqFn39gNVSb/hZ nC06jldOeTumgzH5dxv4VbBfbuCTpm5I8ShoA7+Ub4UNSWXLUJtQRwby0xXaR23S 6KWBZAMW8wJHW8Ish9NNEdZup32ZwhpbLGDVwspHNRyxYa5YUzYQK5medVJ2K+EL dO44kX/lHU+v5SxfOhjbqjJcJWt7WQWA+L1ROIpFV8DkRMT0EscR0v1No1ybQfA= =T3tF -----END PGP SIGNATURE-----

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OsmoSDR progress
by Christian Daniel -- maintech GmbH 06 Mar '12

06 Mar '12

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everybody, following up on Harald's great progress I wrote some tool to verify the RF purity of our design. This is the last step before we can order the final PCBs and start production. Sadly from my current results we have some room for improvements. Right now I'm reviewing the E4000 driver as I suspect the visible steps in the attached spectrum to be switching points in the E4000. Perhaps something can be improved here... Stefan told me that without any antenna the output levels of the E4000 should be below the LSB limit of the ADC - clearly we have a lot of noise on the signal. But we also don't have any I/Q calibration and I can see significant offsets on these lines... I'll keep you posted! Cheerio, Christian - -- - --------------------------------------------------- | 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://enigmail.mozdev.org/ iQEcBAEBAgAGBQJPTzeFAAoJEHkgzUIsAWrilLMH/1s45+iDzv0+YqNpql5sZSs0 88uWFZbbpd22HVY4tifMpe5n4E1bJJBK2Sfuq9t4HDIV/Tka9KijCDT7a3BVbzzQ TqQ3iimSdS7/+UYiNI9OPhdpFaBE1tuCcvWg4lBXct125mynOM/VajLMsXDd/4E6 UVtwUqFxWFXhWXi7/jT/P8+2dhUHZ0sLTsWNp7FS8+SCn7/Uu9QvEc0ZIr8ufaiK NwWTM8O16mUEn0iFMme8WdBhTsi7TTiK23Wd7RZGkZfZeMEr93jPtpvlvkDRlwiF RJC158eAZASsXfyRAw1wr59GVsJF4S7HV88LkKVFS4FOU2t09b/DKZplWnfp0IQ= =5KOA -----END PGP SIGNATURE-----

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Status update OsmoSDR firmware
by Harald Welte 29 Feb '12

29 Feb '12

Hi all, after long struggles with a wrong #define in the atmel provided header file, I've finally made the SSC DMA handshaking working. After some more struggles, the samples are now arriving on the host PC and I can record data with arecord. I will be claning up things later today/tonight and should be able to publish some sample capture files as well as some documentation on the current state of the firwmare. Maintech/SR-Systems will then be doing some measurements on the captured spectrum, after which we hopefully can go into production. I would love to get the first production batch in time for OsmoDevCon2012. Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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