osmocom-sdr

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904 discussions

Raspberry Pi based remote SDR head
by Simon PurplePlaNET 10 May '13

10 May '13

Hi folks, I've been messing around with rtl_tcp and an RTL2832 device on a Raspberry Pi and want to add a bank of front end filters and a LNA that can be controlled by the GPIO. I want to allow manual control of the signal path via a web page hosted on the Pi, but also want to be able to have the filters selected automatically based on the frequency that the RTL device is tuned to. I noticed that rtl_tcp helpfully echos the frequency changes to the console, so I wrote a simple shell script to gather this data and control the GPIO. Somebody may have already done this and there is probably a better way to achieve it but, if this would be of any use to you, please feel free to copy and use as you wish. http://www.purpleplanet.org/?q=rtl-robot Cheers, Simon

4 7

Confirmation that the QuadDVBT works
by Myles Eftos 10 May '13

10 May '13

Hello, I just wanted to let you guys know that the Digital Now Quad DVB-T Receiver (http://digitalnow.com.au/product_pages/Quad.html) works. It's a PCI-e card with 4 tuners on it, linked up internally via USB. This has pleased me no-end - I might finally be able to get DAB+ working on my media centre! I had to add the following line to librtlsdr.c { 0x0413, 0x6680, "QuadDVBT" } Do I need to let anyone else know? Thanks! ---------------------------------------------- Myles Eftos Mobile: +61-409-293-183 MadPilot Productions - Created to be Different URL: http://www.madpilot.com.au Phone: +618-9227-5616 Fax: +618-9467-6289 Try our time tracking system: 88 Miles! http://www.88miles.net

2 1

OsmoSDR Upgrade Board news ?
by Ronny Kunze 06 May '13

06 May '13

1 0

R820T register map available
by Adam Nielsen 03 May '13

03 May '13

Hi all, One of the designers of the R820T tuner has recently been posting on the ultra-cheap-sdr group, and has kindly supplied a map of the R820T registers for private use only within the SDR community. He has asked that it not be posted on any website, but only be forwarded around privately. To that end, if anyone would like a copy of this spreadsheet and would be willing to likewise not publish it on the web, let me know off-list and I'll send it to you. There's not a huge amount in the way of explanations, but it lists all the registers and a very brief description of what they do. Cheers, Adam.

3 2

Re: [Discuss-gnuradio] nVidia's Tegra 4 has SDR - the i500 LTE soft modem from Icera
by est 02 May '13

02 May '13

Hello group, What do you guys think of the nVidia Tegra 4's i500 SDR? http://www.engadget.com/2013/01/07/nvidia-i500-soft-modem/ http://www.nvidia.com/docs/IO/116757/NVIDIA_i500_whitepaper_FINALv3.pdf Is it hackable?

3 3

Compiling on osx - solved...
by Alberto Albiol 01 May '13

01 May '13

Hello I have been fighting to compile the gr-osmosdr package in my osx These are the minor fixes I had to do: 1- Change in Cmakelists.txt: find_package(Boost COMPONENTS thread system), If thread and system is not included then there are linking problems. Although I see that this was removed recently... 2- cmake -DCMAKE_INSTALL_PREFIX=/opt/local (so it is installed together wit my ports intallation, this is really optional) 3- Before compiling I manually edit CmakeCache.txt, and change all the references of /usr/lib/python to /opt/local/lib/python. If not it links agains the system python instead of the ports's python! 4- Add this line in my .bashrc so python can find the package export PYTHONPATH="/opt/local/lib/python2.7/site-packages/" I am aware that this is not the most elegant way to solve the problem but is the only one that I was able to come up. Hope it helps Regards

3 3

Re: rtl_fm scanning
by Colin Stagner 01 May '13

01 May '13

I am also having the rtl_fm scanning bug which was first reported in http://lists.gnumonks.org/pipermail/osmocom-sdr/2013-February/000485.html The scanning mode in rtl_fm hangs during the re-tuning process. This makes it impossible to use rtl_fm in scanning mode. I am using Ubuntu 12.10 with libusb 2:1.0.12-2, the latest git master version of rtl-sdr, and an Elonics E4000 (Realtek, RTL2838UHIDIR). Here are the steps to reproduce: 1. Find some frequency FREQ_NOISE that is not in use, and some frequency FREQ_SIGNAL which is in use constantly (i.e., like a commercial FM station). Find an appropriate squelch value SQUELCH which will stop FREQ_NOISE but pass FREQ_SIGNAL. 2. rtl_fm -f ${FREQ_NOISE} -l ${SQUELCH}. The program should not pass any audio, but it will exit cleanly with ^C. 3. rtl_fm -f ${FREQ_SIGNAL} -l ${SQUELCH}. The program should pass audio and exit cleanly with ^C 4. rtl_fm -f ${FREQ_SIGNAL} -f ${FREQ_NOISE} -l 0. The scan will pause on the first channel and pass audio. 5. rtl_fm -f ${FREQ_NOISE} -f ${FREQ_SIGNAL} -l ${SQUELCH}. The program will not output any audio, even though the first frequency is squelched out and the scanning function should skip immediately to the second frequency. Additionally, it will not exit if sent a SIGINT with ^C, and it must be killed with a SIGKILL. I've made a stack trace of this behavior. The program hangs very consistently at the same location each time: http://pastebin.com/wzE09MCi Thread 1 (the USB buffer reading thread) hangs while waiting for the data_write mutex lock in rtl_fm.c:642. I presume the thread has exhausted its supply of data and isn't getting any more. Thread 2 is slightly more interesting, because it hangs during the libusb system calls within the tuning function rtlsdr_set_center_freq() in librtlsdr.c:796. My guess is that it's making a blocking call that never returns. Can anyone else reproduce this bug?

4 4

submitting patches
by Michael Davis 30 Apr '13

30 Apr '13

Hi All, Can anyone point me in the direction of a place I can go to submit patches? I fixed a bug in CMake for gnuradio-osmosdr that stopped the build on my system. Best, Mike

2 1

Scanning with rtl_fm
by Alan Corey 28 Apr '13

28 Apr '13

I'm using rtl_fm in a scanning (nbfm) situation, and even with the antenna input disconnected and terminated, I get a burst of noise that sounds like a squelch tail maybe once each scan cycle. They're a little over 1 second apart. I've tried setting the squelch up to 10000 where I don't get signals anymore, but I still get the noise. I discovered that if you scan and have the output be a raw audio file, nothing gets recorded when nothing breaks squelch. This makes time-lapse recordings where all the pauses are taken out. Very nice, except for the noise bursts. I'm using: #!/bin/sh rtl_fm -N -S -l 132 -p 102 -f 854040000 -f 854240000 -f 854315000 -f 854415000 -f \ 854490000 -f 854540000 -f 855165000 -f 855240000 -f 858790000 -f 867350000 \ -f 867715000 /tmp/`date +"%Y-%m-%d_%H%M.raw"` and recorded overnight, but I mostly got noise bursts. Alan ----- Radio Astronomy - the ultimate DX

2 2

gr-iqbal or gr-iqbalance?
by Wojciech Kazubski 28 Apr '13

28 Apr '13

Hello! This is a minor issue, but may lead to some misunderstanding (and seach failures) in future. The package to correct IQ imbalance is registered at http://cgit.osmocom.org as gr-iqbal but project name set in line 24 of toplevel CMakeList.txt is gr- iqbalance. Which name should be used while building packages, etc.? BTW: Is there any homepage for gr-iqbal/gr-iqbalance? Wojciech Kazubski

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