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Found 12 results

  1. Hi all, I want to do an implementation of Faster than Nyquist Signalling using GNU-RADIO. I know it is very much related to the OFDM case which I have successfully implemented but how do I integrate the FTN blocks into the OFDM case?
  2. Hello, I got Hackrf One, and am trying to work with it on my raspberry pi. I am constantly getting the following error: hackrf_info: symbol lookup error: hackrf_info: undefined symbol: hackrf_device_list I tried everything. First installing gnu-radio via apt-get and building hackrf master from source code, it didn't work. Then I removed gnu-radio and installed it by PyBombs which a lot of people recommended, but it didn't work as well. My last try was downloading the source codes of gnu-radio, osmosdr, iqbal by git clone and building them one by one which took days for gnu-radio. But still I am always getting the same error when I try to run hackrf_info. Does anyone know what can I do? Please I'd appreciate any help! I've been trying to solve this for 2 weeks, I looked everywhere on the net and found nothing to solve this. Thanks.
  3. Has anyone ever got PyBOMBS to work in Ubuntu 16.04? After following the instructions from their GitHub page (https://github.com/gnuradio/pybombs/), both pip install and building from source, I'm running into the same error when trying to run gnuradio-companion. root@robot:/pybombs# pybombs run gnuradio-companion PyBOMBS - INFO - PyBOMBS Version 2.2.0 Traceback (most recent call last): File "/home/pike/prefix/bin/gnuradio-companion", line 99, in <module> run_main() File "/home/pike/prefix/bin/gnuradio-companion", line 87, in run_main from gnuradio.grc.main import main ImportError: No module named main Or... root@robot:/pybombs# source ~/prefix/setup_env.sh root@robot:/pybombs# gnuradio-companion Traceback (most recent call last): File "/home/pike/prefix/bin/gnuradio-companion", line 99, in <module> run_main() File "/home/pike/prefix/bin/gnuradio-companion", line 87, in run_main from gnuradio.grc.main import main ImportError: No module named main It's failing to import main from gnuradio.grc.main but when I dove into the gnuradio.grc python module, main didn't exist :/. Anyone else experience this before?
  4. at present I am using this live distro: ubuntu-14.04.4-desktop-amd64-gnuradio- (but in the near future I will have a dedicated Linux PC). I have noticed that some blocks are missing... in particular I can find only 2 "source" blocks which are related to various SDR radios (BTW I have an HackRF One) but there are supposed to be more than 2 sources only!. questions: 1) wheresoever can I find the missing blocks? 2) and, moreover, how I can I load/compile or...them so that I can use them in GNUradio Companion??? thanks in advance for your contributions!!! i2NDT Claudio
  5. Hello everyone, I'm trying to understand the demodulation theory and thus understand the GnuRadio graphs implementing software demodulation. I'm still a bit stuck on the bare basics, so here are my questions: 1. I understand that the rational resampler can be used to lower the number of received samples by using the decimation parameter. This is helpful for speeding up the software operations while still keeping the quality. Low-level filter also has the decimation parameter, why isn't that one usually used for decimation? In what case would we use filter's decimation? 2. I understand that the AM demod (for instance) usually has two steps, rectifying the signal to baseband signal and then applying low-pass filter to get rid of unwanted high frequencies (leftovers from the modulation) and get a nice wave. My question is why do we need the low-pass filter before the AM demod (in fact WBFM as well)? Some say that it is for band selection, but shouldn't it then be the band-pass filter? 3. Is there any good information about Frequency xlating FIR filter? I know it can use firdes Python filters, but still haven't got to grips with them. What are the Taps (I know this should be the place for firdes Python call to low_pass_2, but what does it actually mean)? I guess the center frequency is the one I want to tune into... Is this the same frequency as set on SDR input source? Why is this center frequency missing in the low-pass filter block? If this frequency is translated to 0Hz (as docs say), do I still get my left channel? Just by writing these questions down I've made some things clearer to myself. I would still be very grateful if anyone would clarity on these things even more. Also, although I've read anything and everything online that I could find regarding this topic, I would appreciate any resources that you might think of as helpful. Thank you for any info, Andrej
  6. For those of us who want to explore a little more with SDR and own a hackrf or rtlsdr, but not a yardstick one (yet): https://funoverip.net/2014/07/gnu-radio-cc1111-packets-encoderdecoder-blocks/ The decoder module may also help with working out what those bits should be as well.
  7. Hi, I just tried install airprobe in my ubuntu. following tutorial from http://www.rtl-sdr.com/rtl-sdr-tutorial-analyzing-gsm-with-airprobe-and-wireshark/ I have install gnuradio by build script, even until : ./go.sh capture_941.8M_112.cfile everything seems okey.. but when I moved to next step, I got: tes@tes-H67M-D2-B3:~/Downloads/airprobe/gsm-receiver/src/python$ ./gsm_receive_rtl.py -s 1e6 Traceback (most recent call last): File "./gsm_receive_rtl.py", line 22, in <module> import osmosdr ImportError: No module named osmosdr has anyone another idea where the problem might be? Thanks in advance! Bass
  8. Hey All, I am now trying for weeks to setup Gnuradio Companion (3.7.5) with my RTL 2832U... I installed the RTL-SDR and the gr-osmosdr driver as described on Osmocom's Website. "rtl_test -t" works as well as "osmocom_fft -a rtl=0 -v -f 100e6 -s 2.4e6 -g 15" so I think those drivers are properly installed. Nevertheless no source blocks appear in Gnuradio Companion. So does anyone know what I did wrong or what I could try? Is there a fault in the cmake process of gr-osmosdr (cmake output: http://textuploader.com/651n )? Do I need those disabled components: Osmocom IQ Imbalance Correction, sysmocom OsmoSDR? By the way I am using Opensuse 13.2. It would be great if someone could help me. Thanks in advance! Marius
  9. I've spent countless hours trying to get GNURadio-Companion to install along with the needed "source blocks" to make an RTL-SDR Dongle work. Online documention on this is very poor. But I've got it to work, and just for fun I did it twice! This How-To assumes you're running a freshly installed Ubuntu 14.04.1 LTS & assumes you're sort of a newbie to Linux as I am. Below are the commands you type, do not include the quote signs. 1) Log into a desktop terminal 2) Make sure you're in your home directory by typing "cd ~" 3) Type "sudo apt-get install git-core" 4) Type "sudo apt-get install cmake" 5) Type "sudo apt-get install libusb-1.0-0-dev" 6) Type "sudo apt-get install build-essential" 7) Type "git clone git://git.osmocom.org/rtl-sdr.git" 8) Type "cd rtl-sdr" 9) Type "mkdir build" 10) Type "cd build" 11) Type "cmake ../ -DINSTALL_UDEV_RULES=ON" 12) Type "make" 13) Type "sudo make install" 14) Type "sudo ldconfig" If everything worked up to this point you should not see any messages after typing the sudo ldconfig command. 15) Type "cd ~" 16) Type "sudo cp ./rtl-sdr/rtl-sdr.rules /etc/udev/rules.d" 17) Type "sudo reboot" <-- not sure if a reboot is needed at this time, but I seen it listed on a partial list of how-to's, so I did it and my system worked! Once your system reboots log back into a terminal window as before. 18) Type "cd /etc/modprobe.d" 19) Type "sudo nano no-rtl.conf" This will start your editor and put you into a blank file called no-rtl.conf. While you are in the editor type the following 3 lines: blacklist dvb_usb_rtl28xxu blacklist rtl2832 blacklist rtl2830 That is it, just those 3 lines, nothing more! To save the file hold the CTRL key and hit the "O" (oh, not zero), next it enter. Your file is now saved. To exit out of the nano editor type CTRL X. 20) Type "sudo reboot" <-- this reboot is needed! Once your system reboots log back into a terminal window as before. Plug your RTL-SDR into a USB port if you already hadn't. 21) Type "rtl-test -t" You should then see the name of your RTL device as well as some other info. The last line will say "No E4000 tuner found, aborting" Don't worry about this as your RTL-SDR dongle probably has the R820 tuner and not the E4000. If you want to receive ADS-B / Mode-S data you do NOT want the E4000 tuner as it will not tune 1090 MHz. 22) Type "cd ~" 23) Type "git clone git://github.com/pybombs/pybombs" 24) Type "cd /pybombs" 25) Type "./pybombs install uhd gnuradio hackrf" You will be asked a series of questions, simply hit the enter key after each question. It will run for a short time then ask for your sudo password, this actually might happen a couple times during the build process, each time enter your sudo password (same as your user password). You also might be asked to hit the "Y" key a couple times, sometimes I was and sometimes I wasn't. Most of what I've seen online says this process will take 1 1/2 to 2 hours. On my machine (2 Meg Ram & 1.5 GHz processor) it was much closer to 3 hours. 26) When the above build is done there is one last thing to install, this will bring in the "source" and "sink" blocks, something that is missing from every online set of instructions I've seen. Without the "source" block you have no way to use the RTL dongle! So now type "./pybombs install gr-osmosdr" this will take several minutes to run. 27) Type "./pybombs env" 28) Type "source /home/av8tor/target/setup_env.sh" Replace the word av8tor with your username you use to log into Ubuntu, just happens my username is av8tor. 29) Type "gnuradio-companion" now you're HOME FREE!!! One last thing to remember is that everytime you reboot Ubuntu, you'll have to type the "source /home/av8tor/target/setup_env.sh" command or gnuradio-companion will NOT work. I hope this helps other that have had a hardtime getting gnuradio to work. George www.MilAirComms.com
  10. Well, I've been playing with the gnu radio live DVD for a while now, and decided that it might just be easier for me to install the thing on a spare laptop... so I looked for an 'install' option but never found one. On a whim, I decided to use 'sudo dd if=/home/me/gnu.iso of=/dev/sda' to simply throw the image on the laptop hard drive... this was done with a differ computer, of course. I've never tried to write an image directly to a hard drive, so this was sort of an experiment for me. The end result was a bootable gnu radio laptop hard drive. Everything was awesome until I realized what I should have thought of before I started..... the image written to the hard drive was only 2GB. Since I've never done this technique before, I have no idea how to make the system utilize the entire disk (instead of only 2GB). Does anyone have any suggestions or resources that would tell me how to either resize the .iso to allow more space... or resize the hard drive to allocate more space?!? As a side note, disk utilities do not show a valid partition table due to the image making the hard drive look like a CDROM (live CD). I'm stumped. Any suggestions? Thanks!
  11. I'm new to the forum, so first off, HI! Obviously, the latest toy for the Hak5 world is SDR... to be more specific, ADS-B!! It's definately fun, I think everyone would agree. After seeing Darren fire up the LiveCD to show us python code, I went ahead and did the same. All of the command line stuff is the same, but the stupid icons on the desktop are killing me :) I can get everything else to work, except what should be obvious. The four that show up on the desktop are 'GNU Radio Companion', 'GQRX', 'Mode-S Aircraft Monitor', and 'UHD Spectrum Analyzer.' There aren't many tutorials out there other than the ./dump1090 (which isn't included) so here's my question... Nothing happens when I press 'Start' within the Mode-S Aircraft Monitor (desktop) program. Does anyone know how to use 'Mode-S Aircraft Monitor' on the GNU Radio Live CD? Thanks everyone!
  12. Does anyone happen to have any good GNURadio resources they have been using?
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