Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mb03.r1000.mx.aol.com (Internet Inbound) with ESMTP id C38F73800008C; Sun, 1 Apr 2012 14:56:46 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SEPwJ-0006A1-Ci for rs_out_1@blacksheep.org; Sun, 01 Apr 2012 19:55:47 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SEPwI-00069s-8p for rsgb_lf_group@blacksheep.org; Sun, 01 Apr 2012 19:55:46 +0100 Received: from nm16-vm0.bullet.mail.ird.yahoo.com ([77.238.189.192]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1SEPwH-0007oe-VN for rsgb_lf_group@blacksheep.org; Sun, 01 Apr 2012 19:55:46 +0100 Received: from [77.238.189.48] by nm16.bullet.mail.ird.yahoo.com with NNFMP; 01 Apr 2012 18:55:40 -0000 Received: from [212.82.108.133] by tm1.bullet.mail.ird.yahoo.com with NNFMP; 01 Apr 2012 18:55:40 -0000 Received: from [127.0.0.1] by omp1038.mail.ird.yahoo.com with NNFMP; 01 Apr 2012 18:55:40 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 319079.93646.bm@omp1038.mail.ird.yahoo.com Received: (qmail 13347 invoked by uid 60001); 1 Apr 2012 18:55:40 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1333306540; bh=P4Xisa/iobHFCiUpFctiRE7xFoIzUgDjCMth/Q7vCaY=; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=Jk7Iezic6SD7lLZVyfjq0DUyby9g9VoFxTv4NzYTYDWKFA0wPRyVvyQaI08FZs4qDjUmLatRZ/uox529v2OtMODPa+og4x2eCksnM6zDHw80b7WMtMBV4a7o7cfUVOoQ7YuygKypP07ws8TMn2m8VksnQl2nH9eB5z1kPWH9bt0= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.uk; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=0uwZGvu608hc/wMETsJz+AchhBiKVlawjgspTLwr8stVyPW240H6EHRKzd91ae/EPKnTJAqCQHOrp+YssJCPVE5CJBoYlO61RRfki1smXmx/hdlGbfvJUZYkwLG36Qdnjxwbdsj4AgaH1GzR7IoXBXHI3kUC5p7ZlmX//1z4G2A=; X-YMail-OSG: GLXKXLEVM1ld7flKlbV4e1zTRu4bJ4ce2jXXoiDDVdi_V9V K4qHm3D7u_ZIbHHjckZZvv6rYCXUJ7mED3IVxWa6gB5C_juVCB2GdlbTv2DD rcZGZXmZ3NF7MOmBEV2GFu3rceBcCpq3AMpmn.rGz1LnSLf.XNmBJvbzJb0t hH1jCJ5UB9Jil0DoGLaPYT18Mwpj.x6XCKjY0TwCiM3LW3W0551c_C.oKaFV K_ml3Bg7S0Zac7Oikm2LVZc_nVDacrMzJZUX2AjkCTqg4ExAlKb7wRyq8rGn svnpsvG7b18zoJFnlBxp9m4CS3O89fDcisk9Tj1L6mqyuaFzdXTDUR6F6O3M ZeO7Swk6KLHctTSwwDOFW0fIYpBbcpIKbrzIIhVG7T7q2hV_MhVssIpovIZ_ vj2p4l1cYGdrGSwwW_PwdZuKyzFZ201f8TPNjZmUiQ.rIpCB4Nmo2PJDFgBt QzaQX3ElFHj9s0QeJD7T.RT0w8OpRifhzj1bU95K7SyLAetwNgNVd3pHFKNl ZeXyv_0qvcw5dsvZiamEpg85d1QBwkDRIQdCz_6vgTCmetBQoB7yhbDeMAsL t8O7EdZh82D_qYRlLWrzZiBzEKvKA7Z2vG.eDO2YidT87Vo6Vao1k5FZfUr. v Received: from [86.164.58.178] by web171603.mail.ir2.yahoo.com via HTTP; Sun, 01 Apr 2012 19:55:39 BST X-Mailer: YahooMailWebService/0.8.117.340979 References: <05AF1E7F-E679-43A0-BF8C-483A5483F119@me.com> Message-ID: <1333306539.9542.YahooMailNeo@web171603.mail.ir2.yahoo.com> Date: Sun, 1 Apr 2012 19:55:39 +0100 (BST) From: M0FMT To: "rsgb_lf_group@blacksheep.org" In-Reply-To: MIME-Version: 1.0 DomainKey-Status: good (testing) Subject: LF: =?utf-8?B?UmU6IExGOiBGd2Q6IHJ0bC1zZHIg4oCTIE9zbW9TRFI=?= Content-Type: multipart/alternative; boundary="-357169082-407749218-1333306539=:9542" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.2 required=5.0 tests=HTML_70_80,HTML_FONT_BIG, HTML_MESSAGE,TO_ADDRESS_EQ_REAL 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: 1:2:467952832:93952408 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m016.2 ; domain : yahoo.co.uk DKIM : fail x-aol-sid: 3039ac1d60174f78a4ee383e X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ---357169082-407749218-1333306539=:9542 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable John =0A=C2=A0=0AIf I got it right he is using a converter (transverter in = his case) to hetrodyn the HF or LF up to 60 plus megs. Then resolve the sum= frequency using one of these DVB SDR TV and DAB radio USB sticks together = with an SDR PC application. =0A=C2=A0=0AI use a similar arrangement to moni= tor SAQ (17.2 kHz) and most of the LF spectrum, it is a single transistor s= elf oscillating mixer with the IF being a conventional Superhet or Softrock= =C2=A0SDR.=C2=A0=0A=C2=A0=0AUsing a sound card or purpose made AD converter= would=C2=A0probably=C2=A0be just as effective=C2=A0for such low frequencie= s using Spec Lab application giving spectrum waterfall display along with a= sound output.=0AEven older sound cards with a maximum bandwidth of 24kHz g= ive a good account of themselves in the range of most interest.. Dreamers..= . Alphas ..... SAQ .... and the other un-decodeable Mil stations around 18 = to 21kHz. Sound cards can=C2=A0be obtained with a much wider BW nowadays196= kHz and up but be=C2=A0careful reading the spec since they are not necessar= ily designed to be just wide band width AD converters.=0A=C2=A073 es GL Pet= e M0FMT IO91UX=0A=0A=0A________________________________=0A From: John Rabso= n =0ATo: rsgb_lf_group@blacksheep.org =0ASent: Sunday= , 1 April 2012, 16:18=0ASubject: LF: Fwd: rtl-sdr =E2=80=93 OsmoSDR=0A =0A= =0ACould this be any use at LF?=0A=0AJohn F5VLF=0A=0A=0A=0ABegin forwarded = message:=0A=0A=0A>See=C2=A0https://www.youtube.com/watch?v=3DZuRcaxpbYCw=C2= =A0for more info.=0A>=0A>=0A>=0A>=0A>=0A>Osmocom{BB|OpenBSC|DECT|TETRA|SIMT= RACE|SECURITY|GMR|SDR|OP25|planet|lists}=0A>=C2=A0=0A>=09* Login=09* Prefer= ences=09* Help/Guide=09* About Trac=0A>=09* Wiki=09* Timeline=09* View Tick= ets=09* Search=09* Blog=0A>=09* Start Page=09* Index=09* History=09* Last C= hange=0A>=0A>=0A>=091. rtl-sdr=0A>=091. Specifications=0A>=092. Supported H= ardware=0A>=093. Software=0A>=091. Progress=0A>=092. Building the software= =0A>=093. Usage=0A>=094. Known problems=0A>=094. Using the data=0A>=0A>=0A>= rtl-sdr=0A>DVB-T sticks based on the Realtek RTL2832U can be used as a chea= p 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 t= his has been discovered by the V4L/DVB kernel developer=C2=A0=C2=A0Antti Pa= losaari.=0A>Specifications=0A>The RTL2832U outputs 8-bit I/Q-samples, and t= he highest theoretically possible sample-rate is 3.2 MS/s, however, the hig= hest 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).=0A>Supported Ha= rdware=0A>So far, the following devices are supported:=0A>=09* ezcap EzTV66= 8 USB 2.0 DVB-T/DAB/FM stick (Elonics E4000 tuner) (sources:=C2=A0=C2=A0Ali= Express,=C2=A0=C2=A0Dealextreme)=0A>=09* ezcap EzTV666 USB 2.0 DVB-T/DAB/FM= stick (Elonics E4000 tuner,=C2=A0picture=C2=A0)=0A>=09* Hama nano DVB-T st= ick (Elonics E4000 tuner)=0A>=09* Terratec NOXON DAB/DAB+ USB-Stick (Fitipo= wer FC0013 tuner)=0A>People over at reddit=C2=A0=C2=A0are collecting a list= =C2=A0of other devices that are compatible.=0A>Other sticks based on the RT= L2832U might be added in the future as well.=0A>This is the PCB of the ezca= p-stick:=0A>=0A>=0A>More pictures can be found=C2=A0=C2=A0here.=0A>Software= =0A>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.=0A>The code can be= checked out with:=0A>git clone git://git.osmocom.org/rtl-sdr.git =0A>It ca= n also be browsed on=C2=A0=C2=A0http://cgit.osmocom.org/cgit/rtl-sdr/=0A>Pr= ogress=0A>=09* A=C2=A0=C2=A0GNU Radio source block=C2=A0is being created=0A= >Building the software=0A>To build it, simply run 'make' in the src/-direct= ory and make sure you have libusb1.0-0-dev installed.=0A>Usage=0A>Example: = To tune to 392.0 MHz, and set the sample-rate to 1.8 MS/s, use:=0A>./rtl-sd= r /tmp/out.bin -s 1800000 -f 392000000 =0A>If the device can't be opened, m= ake sure you have the appropriate rights to access the device (udev-rules, = or running it as root).=0A>Known problems=0A>=09* If the samples are writte= n to a harddrive, and not a ramdisk, samples may get dropped. An improved v= ersion with proper buffering and asynchronous usage of libusb is in the wor= ks.=0A>Using the data=0A>To convert the data to a standard cfile, following= GNU Radio Block can be used:=0A>=0A>=0A>=0A>The GNU Radio Companion flowgr= aph (rtl2832-cfile.grc) is attached to this page. It is based on the FM dem= odulation flowgraph posted by Alistair Buxton=C2=A0=C2=A0on this thread.=0A= >What has been successfully tested so far is the reception of=C2=A0=C2=A0TE= TRA,=C2=A0=C2=A0GMR=C2=A0and=C2=A0=C2=A0GSM.=C2=A0=0A>=0A>=0A>Multiple GMR-= carriers can be seen in a spectrum view with the full 3.2 MHz bandwidth (at= 3.2 MS/s).=0A>Attachments=0A>=09* rtl2832-cfile.png=C2=A0=C2=A0(23.8 KB) -= added by=C2=A0steve-m=C2=A02 weeks=C2=A0ago.=0A>=09* ezcap_top.jpg=C2=A0= =C2=A0(177.7 KB) - added by=C2=A0steve-m=C2=A02 weeks=C2=A0ago.=C2=A0top vi= ew of the ezcap PCB=0A>=09* rtl2832-cfile.grc=C2=A0=C2=A0(8.6 KB) - added b= y=C2=A0steve-m=C2=A02 weeks=C2=A0ago.=C2=A0GRC flowgraph for the RTL2832 fi= le format=0A>=09* rtl-sdr-gmr.png=C2=A0=C2=A0(42.4 KB) - added by=C2=A0stev= e-m=C2=A02 weeks=C2=A0ago.=C2=A0spectrum view of GMR carriers=0A>=09* EZTV6= 66.JPG=C2=A0=C2=A0(163.3 KB) - added by=C2=A0laforge=C2=A05 days=C2=A0ago.= =C2=A0Similar but smaller EZTV 666 receiver=0A>Download in other formats:= =0A>=09* Plain Text=0A>Powered by=C2=A0Trac 0.11.7=0A>By=C2=A0Edgewall Soft= ware.=0A>Visit the Trac open source project at=0A>http://trac.edgewall.org/= =0A>=0A>=0A> ---357169082-407749218-1333306539=:9542 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
John
 
If I got it right he is using a conve= rter (transverter in his case) to hetr= odyn the HF or LF up to 60 plus megs. Then resolve the sum frequency= using one of these DVB SDR TV and DAB radio USB sticks together with an SDR PC applicat= ion.
 
I = use a similar arrangement to monitor SAQ (17.2 kHz) and most of the LF spec= trum, it is a single transistor self oscillating mixer with the IF being a = conventional Superhet or Softrock SDR. 
 
Using a sound card or purpose made AD converter would probably be just as effective for such low frequencies using Spec Lab application giving = spectrum waterfall display alo= ng with a sound output.
Even older sound cards with = a maximum bandwidth of 24kHz give a good account of themselves in the range= of most interest.. Dreamers... Alphas ..... SAQ .... and the other un-decodeable Mil stations around 18 to 21kHz. Sou= nd cards can be obtained with a much wider BW nowadays196= kHz and up but be careful= reading the spec since they are not necessa= rily designed to= be just wide band width AD converters.
 7= 3 es GL Pete M0FMT IO91UX
<= span style=3D"font-weight: bold;">From: John Rabson <john.rab= son@numeo.fr>
To: r= sgb_lf_group@blacksheep.org
Sent= : Sunday, 1 April 2012, 16:18
Subject: LF: Fwd: rtl-sdr =E2=80=93 OsmoSDR
 =

Could this be any use = at LF?

John F5VLF
=

  1. rtl-sdr
    1. Specif= ications
    2. Supported Hardware
    3. Software
      1. Progress
      2. Building the software
      3. Usage
      4. Known problems
    4. Using the data
      5. <= /ol>

rtl= -sdr

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

S= pecifications

The RTL2832U outputs 8-bit I/Q-samples, and the high= est theoretically possible sample-rate is 3.2 MS/s, however, the highest sa= mple-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).

Supported H= ardware

So far, the following devices are supported:
    <= li>ezcap EzTV668 USB 2.0 DVB-T/DAB/FM stick (Elonics E4000 tuner) (sources:=  =  AliExpress,  Dealextreme)
  • ezcap EzT= V666 USB 2.0 DVB-T/DAB/FM stick (Elonics E4000 tuner, picture 3D"Download"= )
  • Hama nano DVB-T stick (Elonics E4000 tuner)
  • Terratec NOXO= N DAB/DAB+ USB-Stick (Fitipower FC0013 tuner)
People over at = reddit  are collecting a list 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:


More pictures can be found  here.

Software

rtl-sdr is a commandline tool that can initiali= ze 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 git://git.osmocom.org/rtl-sdr.git=0A

Progress

=

Building the software

To build it, simply run 'make' in the src/-director= y and make sure you have libusb1.0-0-dev installed.

Usage

Example: T= o tune to 392.0 MHz, and set the sample-rate to 1.8 MS/s, use:
./rtl-sdr /tmp/out.b=
in -s 1800000 -f 392000000=0A
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 sample= s are written to a harddrive, and not a ramdisk, samples may get dropped. A= n improved version with proper buffering and asynchronous usage of libusb i= s in the works.

Using the data

To convert the data to a standard cfile, following GNU Rad= io Block can be used:

<= br>
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.
What has been successfully tested so far = is the reception of =  TETRA,  GMR and =  GSM. 
3D"spectrum
Multiple GMR-carriers= can be seen in a spectrum view with the full 3.2 MHz bandwidth (at 3.2 MS/= s).

Attachments

  • rtl2832= -cfile.png 3D"Download" (23.8 KB) - added by steve-m 2 weeks ago.
  • ezcap_top.jp= g 3D"Download" (177.7 KB) - added by steve-m 2 weeks ago. top view of the ezca= p PCB
  • rtl2832-cfile.grc 3D"Downlo= (8.6 KB) - added by = steve-m <= a style=3D"color: rgb(187, 0, 0); text-decoration: none; border-bottom-colo= r: rgb(187, 187, 187); border-bottom-width: 1px; border-bottom-style: dotte= d;" class=3D"yiv390570501timeline" title=3D"2012-03-17T21:45:18+0100 in Tim= eline" href=3D"http://sdr.osmocom.org/trac/timeline?from=3D2012-03-17T21%3A= 45%3A18%2B0100&precision=3Dsecond" rel=3D"nofollow" target=3D"_blank">2= weeks ag= o. GRC flo= wgraph for the RTL2832 file format
  • rtl-sdr-gmr.png 3D"Downlo= (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:

3D"Trac<= div style=3D"margin: 0px; text-align: right; float: right;">Visit the Trac = open source project at
http://trac.edgewall.org/
3D"Creative

<= /div>



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