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(john.rabson@numeo.fr@217.67.155.178) by smtp.qtxt.dns-iol.com with SMTP; 2 Apr 2012 11:32:09 +0200 From: John Rabson Mime-Version: 1.0 (Apple Message framework v1257) Date: Mon, 2 Apr 2012 11:32:09 +0200 In-Reply-To: <1333306539.9542.YahooMailNeo@web171603.mail.ir2.yahoo.com> To: rsgb_lf_group@blacksheep.org References: <05AF1E7F-E679-43A0-BF8C-483A5483F119@me.com> <1333306539.9542.YahooMailNeo@web171603.mail.ir2.yahoo.com> Message-Id: X-Mailer: Apple Mail (2.1257) X-Spam-Score: 3.2 (+++) X-Spam-Report: autolearn=disabled,HTML_FONT_BIG=0.256,HTML_MESSAGE=0.001,HTML_TINY_FONT=1.425,SUBJECT_ENCODED_TWICE=1.543 Content-Type: multipart/alternative; boundary="Apple-Mail=_D467CC78-421A-49A3-9DFF-D57EB3B1E518" Subject: LF: =?windows-1252?Q?Re=3A_LF=3A_Re=3A_LF=3A_Fwd=3A_rtl-sdr_=96_Osmo?= =?windows-1252?Q?SDR?= 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 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: 1:2:485668800:93952408 x-aol-sid: 3039ac1d60574f7972567b92 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --Apple-Mail=_D467CC78-421A-49A3-9DFF-D57EB3B1E518 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 Pete, Many thanks. John F5VLF On 1 Apr 2012, at 20:55CEST, M0FMT wrote: > John > =20 > If 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. > =20 > I use a similar arrangement to monitor SAQ (17.2 kHz) and most of the = LF spectrum, it is a single transistor self oscillating mixer with the = IF being a conventional Superhet or Softrock SDR.=20 > =20 > 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 along 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. Sound cards can be obtained with a much wider BW nowadays196kHz = and up but be careful reading the spec since they are not necessarily = designed to be just wide band width AD converters. > 73 es GL Pete M0FMT IO91UX > From: John Rabson > To: rsgb_lf_group@blacksheep.org=20 > Sent: Sunday, 1 April 2012, 16:18 > Subject: LF: Fwd: rtl-sdr =96 OsmoSDR >=20 > Could this be any use at LF? >=20 > John F5VLF >=20 > Begin forwarded message: >=20 >>=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. >> 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). >> Supported Hardware >>=20 >> So far, the following devices are supported: >> 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. >> Other sticks based on the RTL2832U might be added in the future as = well. >> This is the PCB of the ezcap-stick: >>=20 >>=20 >> More pictures can be found here. >> 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. >> The code can be checked out with: >> git clone git://git.osmocom.org/rtl-sdr.git >> It can also be browsed on http://cgit.osmocom.org/cgit/rtl-sdr/ >> 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. >> Usage >>=20 >> 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 >>=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. >> 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). >> 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 >=20 >=20 >=20 --Apple-Mail=_D467CC78-421A-49A3-9DFF-D57EB3B1E518 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252
John =
 
If 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. =
 
I use a similar = arrangement to monitor SAQ (17.2 kHz) and most of the LF spectrum, 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 along 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. = Sound cards can be obtained with a much wider BW = nowadays196kHz and up but be careful reading the spec since = they are not necessarily = designed to be just wide = band width AD converters.
 73 es GL = Pete M0FMT IO91UX

Could this be any = use at LF?

John F5VLF

Begin = forwarded message:




  1. rtl-sdr
    1. Specifications
    2. Supported Hardware
    3. Software
      1. Progress
      2. Building the software
      3. Usage
      4. Known problems
    4. 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  Antti Palosaari.

Specifications

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).

Supported Hardware

So = far, the following devices are supported:
  • 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 3D"Download"= )
  • 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.
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  here.

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 git://git.osmocom.org/rtl-sdr.git

Progress

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  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

Download in other = formats:

Visit the Trac open source project = at
http://trac.edgewall.org/
3D"Creative





=

= --Apple-Mail=_D467CC78-421A-49A3-9DFF-D57EB3B1E518--