osmocom-sdr

osmocom-sdr@lists.osmocom.org

1 participants
912 discussions

[osmo-fl2k] can't receive anything
by DC7IA 27 Apr '18

27 Apr '18

Hi there, I've set up osmo-fl2k yesterday and since then I'm trying to get WBFM or GSM working, but I cannot receive anything. Software does not give me any errors, so I don't know where to look for the problem. Maybe I should note that I'm only able to use USB 2.0 on my Thinkpad T400, could that make trouble as it is a USB 3.0 device? -- *73 Joshua Hoffmann DC7IA | KK4RVI * stellv. AJW-Referent im Distrikt O (Süd-Westfalen) AJW-Seite des Distriktes <http://www.darc.de/distrikte/o/referate/ajw/> Diese E-Mailadresse ist ausschließlich für Mailinglisten E-Mails. Normale E-Mails an DC7IA(a)DARC.de senden, da sie andernfalls nicht rechtzeitig gelesen werden.

2 1

can we do Quadrature pairs?
by Justin Kelly 26 Apr '18

26 Apr '18

can the USB to VGA adapter output quadrature I and Q pairs via the red and blue channels? with maybe using green as a configurable local oscillator. -Justin -- --Evil people do evil things, how is irrelevant.

4 3

osmo-fl2k
by Riccardo Rossi 25 Apr '18

25 Apr '18

Hi, i want to ask you which screen do you use in the picture in the website and also if this https://www.amazon.it/dp/B019DUI17Q/ref=cm_sw_r_wa_api_i_on53AbMBGRVYA has the correct chip Thank you Riccardo Rossi

2 1

fl2k RGB buffer format
by Abhishek Goyal 25 Apr '18

25 Apr '18

I am trying to understand the layout of the RGB buffers sent to the fl2k over USB. From lines 755-820 in libosmo-fl2k.c I can see the RGB buffers are "serialized" in this order: g1,r1,b2,g2,b0,g0,r0,b1,b4,g4,r4,b5,r2,b3,g3,r3,r6,b7,g7,r7,g5,r5,b6,g6 (where r0 is the red component of first pixel, b3 is the blue component of fourth pixel, etc) What is this layout? Why does the chip expect the pixels to be sent in this order?

2 2

Bug: gr-osmoscom for USRP B210 have this weird center frequency signal while gr-UHD don't
by Ignatius Rivaldi 24 Apr '18

24 Apr '18

Hi, At first I reported this bug at Gqrx mailing list: https://groups.google.com/forum/#!topic/gqrx/pVea3JObMLw , then Csete mentioned that Gqrx uses gr-osmosdr source, while I'm using gr-uhd source. Then I tried it again using osmocom source, then that weird center frequency noise appears again. I've attached several screenshots and GRC flowchart that I used to reproduce this bug (it uses gr-fosphor). Maedhros_008.png is the screenshot of gr-fosphor displaying the correct UHD: USRP source, with all of FM broadcast radio visible, while Maedhros_011.png is the gr-fosphor showing the output of osmocom source, with this big ~2MHz spike at center frequency, and all of those FM broadcast radio are not visible. I'm using Arch Linux with gnuradio, gr-fosphor, and gr-osmosdr compiled from source using makepkg/pkgbuild system, and libuhd 3.10.2.0-3

2 1

Gnuradio >= 3.7.12.0 breaks gr-fosphor
by Ignatius Rivaldi 19 Apr '18

19 Apr '18

Hi, A QT API change in Gnuradio 3.17.12.0 : https://github.com/gnuradio/gnuradio/pull/1418 breaks modules that relies on QT windowing system, resulting in Template error on generated python file, resulting in this error when I try to run the generated python file: Executing: /usr/sbin/python2 -u /home/feanor/Development/SDR/top_block.py File "/home/feanor/Development/SDR/top_block.py", line 69 self.fosphor_qt_sink_c_2 = Template error: #set $win = 'self._%s_win'%$id ^ SyntaxError: invalid syntax >>> Done (return code 1) This also affects other modules that relies on QT: gr-inspector: https://github.com/gnuradio/gr-inspector/issues/2 Following the fix in this pull request for gr-inspector: https://github.com/gnuradio/gr-inspector/pull/21/commits/9d00bb83c155c84ee8… by changing a line: 15c15 < $(gui_hint()($win))</make> --- > $(gui_hint() % $win)</make> fixes the problem for gr-fosphor and make the flowgraph runnable again

3 2

windows GNU Radio error 12 Fatal failed to find rtlsdr device
by Jose Mihotek 17 Apr '18

17 Apr '18

All, I installed GNU Radio for windows on my machine running Windows 10.when I try to run GRC it comes back with: <<< Welcome to GNU Radio Companion 3.7.11.1 >>> Block paths: C:\Program Files\GNURadio-3.7\share\gnuradio\grc\blocks Loading: "C:\Users\JoseM\Documents\GNU\test w grc.grc">>> Done Generating: 'C:\\Users\\JoseM\\Documents\\GNU\\top_block.py' Executing: C:\Program Files\GNURadio-3.7\gr-python27\python.exe -u C:\Users\JoseM\Documents\GNU\top_block.py Win32; Microsoft Visual C++ version 14.0; Boost_106000; UHD_003.010.001.001-0-unknown gr-osmosdr c653754d (0.1.5git) gnuradio 3.7.11.1built-in source types: file osmosdr fcd rtl rtl_tcp uhd hackrf bladerf airspy redpitaya Using device #0 Generic RTL2832U OEMusb_open error -12 FATAL: Failed to open rtlsdr device. Trying to fill up 1 missing channel(s) with null source(s).This is being done to prevent the application from crashingdue to gnuradio bug #528. Anybody have any idea how to fix this ?Thanks, Jose

1 0

Re: Meaning of rtl_fm output values
by Müller, Marcus (CEL) 15 Mar '18

15 Mar '18

Hi Theodric, no, these values that appear on stdout are already audio samples (PCM to be specific). That is the "job" of rtl_fm: It takes the complex time-domain baseband samples from the hardware, detects FM (which implies detecting a frequency deviation) and convert that to audio amplitude values. The `aplay` command barely takes these samples and hands them over to the sound card (after resampling to fit possible sampling rates, I guess, as 120 kHz isn't something that sound systems usually operate at). The `rtl_fm` command takes a couple of parameters. In your case, `-M wbfm` means that it's demodulating FM in a way compatible to broadcast FM; that implies fixed parameters for deviation, emphasis etc. What you want is really not `rtl_fm`, which primarily is a demo program, not meant to be a flexible do-it-all solution. What you want, showing deviation of a station, does very much sound like a spectrum visualization. Wouldn't a waterfall or even just an instantaneous spectrum visualization be what you want? Best regards, Marcus On Wed, 2018-03-14 at 15:57 -0400, Theodric Young wrote: > Hi, > > I'm new to SDR and I have a question about the data values that are > generated by the rtl_fm program. > > I got rtl_fm running on my system (cygwin running on Windows 7). It is > sending a stream of 16-bit signed integer values to stdout which I can > redirect to a file or pipe to an audio playback system, such as sox. So > when I do this: > > rtl_fm -f 88.1M -M wbfm -s 240k -r120k -g 30 | play -t raw -r 120k -b > 16 -c 1 -e s -V1 - > > I hear sweet, sweet music! Hurray! > > But how do these 16-bit integers relate to the modulation level of the > carrier? I'm assuming that the values are directly proportional to the > instantaneous frequency deviation of the transmitted signal. Is that > right? If so, how do I determine that ratio? I'm hoping to use this to > build a device that shows total modulation (as a percentage of the > maximum modulation of +/- 75kHz) for an FM radio station. > > Also, I'm assuming that the sample-rate of the output data stream needs > to be at least 120kHz because the baseband signal includes the stereo > pilot (19kHz), the stereo subcarrier (38kHz) and an RBDS subcarrier (57 > kHz). > > Any insight would be appreciated. Thanks in advance, > > Theodric Young

1 0

None
by None 15 Mar '18

15 Mar '18

by outgoing.mit.edu (8.13.8/8.12.4) with ESMTP id w2EJvsmv004135 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT) for <osmocom-sdr(a)lists.osmocom.org>; Wed, 14 Mar 2018 15:57:55 -0400 To: osmocom-sdr(a)lists.osmocom.org From: Theodric Young <theodric(a)mit.edu> Subject: Meaning of rtl_fm output values Message-ID: <d96cc71b-6d81-d786-ccd1-708c84eba0ff(a)mit.edu> Date: Wed, 14 Mar 2018 15:57:55 -0400 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrPIsWRmVeSWpSXmKPExsUixCmqrHusbmWUwc1tLBb7Jl9hcWD0WHXa I4AxissmJTUnsyy1SN8ugSvjx87tbAX7OSv2bJ/G3sC4lr2LkZNDQsBEYvqcdSxdjFwcQgKL mSQWnj/DCuFcZZSY37eNDcKZxizRv/4YI0iLiICixOTf24FaODjYBNQlJv6zAQkLC2hIrL91 jwXE5hWwkvh96Q0TiM0ioCrxdtsWZhBbVCBGomXJB0aIGkGJkzOfgNUzC5hJzNv8kBnClpfY /nYO8wRG3llIymYhKZuFpGwBI/MqRtmU3Crd3MTMnOLUZN3i5MS8vNQiXRO93MwSvdSU0k2M 4FCS5N/BOKfB+xCjAAejEg+vgdrKKCHWxLLiytxDjJIcTEqivPunrIgS4kvKT6nMSCzOiC8q zUktPsQowcGsJMJ7vxConDclsbIqtSgfJiXNwaIkzutuoh0lJJCeWJKanZpakFoEk5Xh4FCS 4D1cC9QoWJSanlqRlplTgpBm4uAEGc4DNFyuDmR4cUFibnFmOkT+FKMxx5+HL9uYOW68eN3G LMSSl5+XKiXO+x5knABIaUZpHtw0UDq4yHbi3CtGcaDnhHkFQAbyAFMJ3LxXQKuYgFZlblsB sqokESEl1cAYvC/tgHRlS0bd5jnmP/RrNsU/5J6oKV7p8ixCsX/y/3f1+69NufA6bvK/ZD3H 9ONOL50fx7tsVejkM1b7PVkywsPsRnRig7Vbm3R4CnNom/9rs3aJA/Oas4WZ3H7tupb8N8np Qy/bcu5Nib3zr84VOPDxw2mnkitF08Nv2O89u0UxJ+n8wa9KLMUZiYZazEXFiQCH7MfT4gIA AA== X-BeenThere: osmocom-sdr(a)lists.osmocom.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: "Discussion on Osmocom SDR projects $OsmoSDR, rtl-sdr$" <osmocom-sdr.lists.osmocom.org> List-Unsubscribe: <https://lists.osmocom.org/mailman/options/osmocom-sdr>, <mailto:osmocom-sdr-request@lists.osmocom.org?subject=unsubscribe> List-Archive: <http://lists.osmocom.org/pipermail/osmocom-sdr/> List-Post: <mailto:osmocom-sdr@lists.osmocom.org> List-Help: <mailto:osmocom-sdr-request@lists.osmocom.org?subject=help> List-Subscribe: <https://lists.osmocom.org/mailman/listinfo/osmocom-sdr>, <mailto:osmocom-sdr-request@lists.osmocom.org?subject=subscribe> X-List-Received-Date: Wed, 14 Mar 2018 19:57:59 -0000 Hi, I'm new to SDR and I have a question about the data values that are generated by the rtl_fm program. I got rtl_fm running on my system (cygwin running on Windows 7). It is sending a stream of 16-bit signed integer values to stdout which I can redirect to a file or pipe to an audio playback system, such as sox. So when I do this: rtl_fm -f 88.1M -M wbfm -s 240k -r120k -g 30 | play -t raw -r 120k -b 16 -c 1 -e s -V1 - I hear sweet, sweet music! Hurray! But how do these 16-bit integers relate to the modulation level of the carrier? I'm assuming that the values are directly proportional to the instantaneous frequency deviation of the transmitted signal. Is that right? If so, how do I determine that ratio? I'm hoping to use this to build a device that shows total modulation (as a percentage of the maximum modulation of +/- 75kHz) for an FM radio station. Also, I'm assuming that the sample-rate of the output data stream needs to be at least 120kHz because the baseband signal includes the stereo pilot (19kHz), the stereo subcarrier (38kHz) and an RBDS subcarrier (57 kHz). Any insight would be appreciated. Thanks in advance, Theodric Young

1 0

antenna enquiry/long praise inc
by mary 14 Mar '18

14 Mar '18

1 0

← Newer
1
...
27
28
29
30
31
32
33
...
92
Older →

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

osmocom-sdr