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(john.rabson@numeo.fr@217.67.155.178) by smtp.qtxt.dns-iol.com with SMTP; 1 Apr 2012 17:18:47 +0200 From: John Rabson Date: Sun, 1 Apr 2012 17:18:52 +0200 References: <05AF1E7F-E679-43A0-BF8C-483A5483F119@me.com> To: rsgb_lf_group@blacksheep.org Message-Id: Mime-Version: 1.0 (Apple Message framework v1257) X-Mailer: Apple Mail (2.1257) X-Spam-Score: 1.7 (+) X-Spam-Report: autolearn=disabled,HTML_FONT_BIG=0.256,HTML_MESSAGE=0.001,HTML_TINY_FONT=1.425 Content-Type: multipart/alternative; boundary="Apple-Mail=_DF2475B6-4810-44AB-8B4D-59B9D4036BE6" Subject: LF: =?windows-1252?Q?Fwd=3A_rtl-sdr_=96_OsmoSDR?= X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 1:2:457914784:93952408 x-aol-sid: 3039ac1d60c94f7872322d53 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --Apple-Mail=_DF2475B6-4810-44AB-8B4D-59B9D4036BE6 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 Could this be any use at LF? John F5VLF Begin forwarded message: >=20 > See https://www.youtube.com/watch?v=3DZuRcaxpbYCw for more info. >=20 >=20 > = Osmocom{BB|OpenBSC|DECT|TETRA|SIMTRACE|SECURITY|GMR|SDR|OP25|planet|lists}= >=20 > =20 > LoginPreferencesHelp/GuideAbout Trac > WikiTimelineView TicketsSearchBlog > Start PageIndexHistoryLast Change >=20 > rtl-sdr > Specifications > Supported Hardware > Software > Progress > Building the software > Usage > Known problems > Using the data >=20 > rtl-sdr > DVB-T sticks based on the Realtek RTL2832U can be used as a cheap SDR, = since the chip allows transferring the raw I/Q samples to the host, = which is officially used for DAB/DAB+/FM demodulation. The possibility = of this has been discovered by the V4L/DVB kernel developer Antti = Palosaari. >=20 > Specifications >=20 > The RTL2832U outputs 8-bit I/Q-samples, and the highest theoretically = possible sample-rate is 3.2 MS/s, however, the highest sample-rate = without lost samples that has been tested so far is 2.8 MS/s. The = frequency range is highly dependent of the used tuner, sticks that use = the Elonics E4000 offer the best range (64 - 1700 MHz). >=20 > Supported Hardware >=20 > So far, the following devices are supported: >=20 > ezcap EzTV668 USB 2.0 DVB-T/DAB/FM stick (Elonics E4000 tuner) = (sources: AliExpress, Dealextreme) > ezcap EzTV666 USB 2.0 DVB-T/DAB/FM stick (Elonics E4000 tuner, picture = ) > Hama nano DVB-T stick (Elonics E4000 tuner) > Terratec NOXON DAB/DAB+ USB-Stick (Fitipower FC0013 tuner) > People over at reddit are collecting a list of other devices that are = compatible. >=20 > Other sticks based on the RTL2832U might be added in the future as = well. >=20 > This is the PCB of the ezcap-stick: >=20 >=20 > More pictures can be found here. >=20 > Software >=20 > rtl-sdr is a commandline tool that can initialize the RTL2832, tune to = a given frequency, and record the I/Q-samples to a file. >=20 > The code can be checked out with: >=20 > git clone git://git.osmocom.org/rtl-sdr.git > It can also be browsed on http://cgit.osmocom.org/cgit/rtl-sdr/ >=20 > Progress >=20 > A GNU Radio source block is being created > Building the software >=20 > To build it, simply run 'make' in the src/-directory and make sure you = have libusb1.0-0-dev installed. >=20 > Usage >=20 > Example: To tune to 392.0 MHz, and set the sample-rate to 1.8 MS/s, = use: >=20 > ./rtl-sdr /tmp/out.bin -s 1800000 -f 392000000 > If the device can't be opened, make sure you have the appropriate = rights to access the device (udev-rules, or running it as root). >=20 > Known problems >=20 > If the samples are written to a harddrive, and not a ramdisk, samples = may get dropped. An improved version with proper buffering and = asynchronous usage of libusb is in the works. > Using the data >=20 > To convert the data to a standard cfile, following GNU Radio Block can = be used: >=20 >=20 >=20 > The GNU Radio Companion flowgraph (rtl2832-cfile.grc) is attached to = this page. It is based on the FM demodulation flowgraph posted by = Alistair Buxton on this thread. >=20 > What has been successfully tested so far is the reception of TETRA, = GMR and GSM.=20 >=20 >=20 > Multiple GMR-carriers can be seen in a spectrum view with the full 3.2 = MHz bandwidth (at 3.2 MS/s). >=20 > Attachments >=20 > rtl2832-cfile.png (23.8 KB) - added by steve-m 2 weeks ago. > ezcap_top.jpg (177.7 KB) - added by steve-m 2 weeks ago. top view of = the ezcap PCB > rtl2832-cfile.grc (8.6 KB) - added by steve-m 2 weeks ago. GRC = flowgraph for the RTL2832 file format > rtl-sdr-gmr.png (42.4 KB) - added by steve-m 2 weeks ago. spectrum = view of GMR carriers > EZTV666.JPG (163.3 KB) - added by laforge 5 days ago. Similar but = smaller EZTV 666 receiver > Download in other formats: > Plain Text > Powered by Trac 0.11.7 > By Edgewall Software.Visit the Trac open source project at > http://trac.edgewall.org/ >=20 >=20 >=20 --Apple-Mail=_DF2475B6-4810-44AB-8B4D-59B9D4036BE6 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 Could this be any use = at LF?

John F5VLF

Begin forwarded = message:


Osmocom{BB|OpenBSC|DECT|TETRA|SIMTRACE|SECURITY|GMR|SDR|OP25|planet|
3D"OsmoSDR"
 

  1. rtl-sdr
    1. Supported = Hardware
    2. Software
      1. Progress
      2. Building the = software
      3. Usage
      4. Known = problems
    3. Using the = data

rtl-sdr

DVB-T sticks based on the = Realtek RTL2832U can be used as a cheap SDR, since the chip allows = transferring the raw I/Q samples to the host, which is officially used = for DAB/DAB+/FM demodulation. The possibility of this has been = discovered by the V4L/DVB kernel developer 

The RTL2832U outputs 8-bit = I/Q-samples, and the highest theoretically possible sample-rate is 3.2 = MS/s, however, the highest sample-rate without lost samples that has = been tested so far is 2.8 MS/s. The frequency range is highly dependent = of the used tuner, sticks that use the Elonics E4000 offer the best = range (64 - 1700 MHz).

So far, the following = devices are supported:

  • ezcap EzTV668 USB 2.0 DVB-T/DAB/FM = stick (Elonics E4000 tuner) (sources:   picture 3D"Download")
  • Hama nano DVB-T = stick (Elonics E4000 tuner)
  • Terratec NOXON DAB/DAB+ USB-Stick = (Fitipower FC0013 tuner)

People over at reddit  of other devices that are = compatible.

Other sticks based on the RTL2832U might be added in = the future as well.

This is the PCB of the ezcap-stick:

3D"top
More pictures can be = found Software

rtl-sdr is a commandline = tool that can initialize the RTL2832, tune to a given frequency, and = record the I/Q-samples to a file.

The code can be checked out = with:

git clone  
Building the software
To build it, simply run =
'make' in the src/-directory and make sure you have libusb1.0-0-dev =
installed.
Usage
Example: To tune to 392.0 =
MHz, and set the sample-rate to 1.8 MS/s, use:
./rtl-sdr /tmp/out.bin -s 1800000 -f 392000000

If the device can't be opened, make sure you have the =
appropriate rights to access the device (udev-rules, or running it as =
root).
Known problems
  • If the samples are =
written to a harddrive, and not a ramdisk, samples may get dropped. An =
improved version with proper buffering and asynchronous usage of libusb =
is in the works.
Using the data
To convert the data to a =
standard cfile, following GNU Radio Block can be used:



The GNU Radio Companion =
flowgraph (rtl2832-cfile.grc) is attached to this page. It is based on =
the FM demodulation flowgraph posted by Alistair Buxton    and  

3D"spectrum
Multiple GMR-carriers can be =
seen in a spectrum view with the full 3.2 MHz bandwidth (at 3.2 =
MS/s).

rtl2832-cfile.png 3D"Download" (23.8 KB) - added by steve-m 2 weeks ago.
  • ezcap_top.jpg 3D"Download" (177.7 KB) - added by steve-m 2 weeks ago. top view of the ezcap = PCB
  • rtl2832-cfile.grc 3D"Download" (8.6 KB) - added by steve-m 2 weeks ago. GRC flowgraph for the = RTL2832 file format
  • rtl-sdr-gmr.png 3D"Download" (42.4 KB) - added by steve-m 2 weeks ago. spectrum view of GMR = carriers
  • EZTV666.JPG 3D"Download" (163.3 KB) - added by laforge 5 days ago. Similar but smaller EZTV = 666 receiver

    • Download in other formats:



    = --Apple-Mail=_DF2475B6-4810-44AB-8B4D-59B9D4036BE6--