Anderson Moreira | 6 Feb 21:02 2016
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Scanning frequency GSM

Good afternoon everyone.
I'm starting in radio frequency. Making analysis of spectra using uhd_fft.py in search of a channel (ARFCN) not used by the operator (GSM), one doubts arose: is it possible to automate this process? A script, library, etc. running a scan on a GSM frequencies of range and find unused channels.

Thanks.
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Srinivasan T | 6 Feb 05:58 2016
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Re : Info on 2.4 GHz

Hi All

 

I am Srinivasan living in Singapore and have M.Sc. Comp.Sci.

 

My self and few engineers have detected unknown RF at 2.4 GHz which has different FFT pattern, waterfall image, Radio Sound.

The identification and classification of the signal is really difficult process.

 

Below is the video reference :

 

·         FFT at 2.4 GHz ( we can see sudden fluctuation and power in db is really high )

    https://sendvid.com/33f5hpkg

    Detail : On this video, we can see peak hold in green color that leave a trace something comes and go. Peak Hold line in green color shows external signal interfered at 2.4 GHz

                 The fluctuation looks like external RF writing to it.

 

·         Spectrum Density of RF at 2.4 GHz 

    http://sendvid.com/mu9m2jeg

    Details : I have taken this video at place where there was no devices that operate at 2.4 GHz ( near plantations ).

    We can see noise floor in blue color comes and go.

    This external interference cause Wi-Fi at 2.4 GHz to fluctuate and sudden fluctuate at different power level will increase of SNR of Wi-Fi ( signal to noise ratio ) 

 

·         AirMagnet XT 

    https://sendvid.com/tkq3xz0s  

    Details : This software one of the best software available in the market for detection  interference  Wi-Fi at 2.4 GHz with different options.

    We can see FFT picture at real time in     leave suddenly max   hold around -10 dBm.

 

·         Wi-Fi Fluctuations at Siloam Hospital in Medan - Indonesia

    http://sendvid.com/2u2j34m7

I reported this issue to :

 

1. iDA        - Singapore  ( Radio Spectrum monitor - Goverment agency )

2. MCMC - Singapore  ( Radio Spectrum monitor - Goverment agency )

3. Balmon - Indonesia ( Radio Spectrum monitor - Goverment agency )

4. Flight Operator because this unknown signal works on the flight as well.

 

They are not sure on how to pin point the source and other mechanism.

This signal works in 3 countries : Indonesia, Malaysia and Singapore.

The source may come from Satellite and possibility from SES-7 because this satellite has S-band transponder.

 

Based on my detection :

1. The RF covered by Wi-Fi signal. This can be seen while recording the signal in wav format using SDR# and HackRF

    Image below :

   

2. The carrier frequency is 2.4 GHz

3. Density value which I recorded :

    1.   0.4187 mW / m2      ( 418.7   µW / m2 )      

    2.   0.5520 mW / m2      ( 552.0   µW / m2 )      

    3.   15.92  mW / m2       ( 15920  µW / m2 )

    4. Recently i detected 1827 mW / m2 = 1.827 W / m2   =  1827000 uW / m2

 

Attached Radio Sound file :

https://mega.nz/#!8thAzY5D!4ZfOmHLSttQKtYQQlz6BBVtV_vqjrVsxSRiJVzdnRqs

 

Attached technical analysis in 84 pages ;

https://mega.nz/#!YwplVCCT!Acbe00paHk3dLJuf04B5zSBifSw0-bHz5IciiNLgQwY

 

I know that Radio Sound that can be analyst further.

I am looking for external expert - urgently to help on this. Looking forward for your reply.

 

Regards

 

 

Srinivasan T

HP : 65 - 91236851

 

 

 

 

 

 

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Srinivasan T | 6 Feb 05:55 2016
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Re : Info and Support

Hi All

 

I am Srinivasan living in Singapore and have M.Sc. Comp.Sci.

 

My self and few engineers have detected unknown RF at 2.4 GHz which has different FFT pattern, waterfall image, Radio Sound.

The identification and classification of the signal is really difficult process.

 

Below is the video reference :

 

·         FFT at 2.4 GHz ( we can see sudden fluctuation and power in db is really high )

    https://sendvid.com/33f5hpkg

    Detail : On this video, we can see peak hold in green color that leave a trace something comes and go. Peak Hold line in green color shows external signal interfered at 2.4 GHz

                 The fluctuation looks like external RF writing to it.

 

·         Spectrum Density of RF at 2.4 GHz 

    http://sendvid.com/mu9m2jeg

    Details : I have taken this video at place where there was no devices that operate at 2.4 GHz ( near plantations ).

    We can see noise floor in blue color comes and go.

    This external interference cause Wi-Fi at 2.4 GHz to fluctuate and sudden fluctuate at different power level will increase of SNR of Wi-Fi ( signal to noise ratio ) 

 

·         AirMagnet XT 

    https://sendvid.com/tkq3xz0s  

    Details : This software one of the best software available in the market for detection  interference  Wi-Fi at 2.4 GHz with different options.

    We can see FFT picture at real time in     leave suddenly max   hold around -10 dBm.

 

·         Wi-Fi Fluctuations at Siloam Hospital in Medan - Indonesia

    http://sendvid.com/2u2j34m7

I reported this issue to :

 

1. iDA        - Singapore  ( Radio Spectrum monitor - Goverment agency )

2. MCMC - Singapore  ( Radio Spectrum monitor - Goverment agency )

3. Balmon - Indonesia ( Radio Spectrum monitor - Goverment agency )

4. Flight Operator because this unknown signal works on the flight as well.

 

They are not sure on how to pin point the source and other mechanism.

This signal works in 3 countries : Indonesia, Malaysia and Singapore.

The source may come from Satellite and possibility from SES-7 because this satellite has S-band transponder.

 

Based on my detection :

1. The RF covered by Wi-Fi signal. This can be seen while recording the signal in wav format using SDR# and HackRF

    Image below :

   

2. The carrier frequency is 2.4 GHz

3. Density value which I recorded :

    1.   0.4187 mW / m2      ( 418.7   µW / m2 )      

    2.   0.5520 mW / m2      ( 552.0   µW / m2 )      

    3.   15.92  mW / m2       ( 15920  µW / m2 )

    4. Recently i detected 1827 mW / m2 = 1.827 W / m2   =  1827000 uW / m2

 

Attached Radio Sound file :

https://mega.nz/#!8thAzY5D!4ZfOmHLSttQKtYQQlz6BBVtV_vqjrVsxSRiJVzdnRqs

 

Attached technical analysis in 84 pages ;

https://mega.nz/#!YwplVCCT!Acbe00paHk3dLJuf04B5zSBifSw0-bHz5IciiNLgQwY

 

I know that Radio Sound that can be analyst further.

I am looking for external expert - urgently to help on this. Looking forward for your reply.

 

Regards

 

 

Srinivasan T

HP : 65 - 91236851

 

 

 

 

 

 

 

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Collins, Richard | 6 Feb 04:48 2016

Trouble with Pybombs 2.0.0

Hello,

I recently tried installing gnuradio on two newer core-i7 machines (both with Ubuntu 14.04LTS) with the new version of pybombs. 

Trying to stay away from pip (since I guess it's not updated as soon or often?), I used the following commands to attempt both installs:
cd pybombs
sudo python setup.py install
cd ..
pybombs recipes add gr-recipes git+https://github.com/gnuradio/gr-recipes.git
pybombs recpies add gr-etcetera git+https://github.com/gnuradio/gr-etcetera.git
sudo pybombs prefix init /usr/local -a gr_prefix
pybombs config default_prefix gr_prefix
sudo pybombs install gnuradio

Both resulted in problems.
On Computer1, it completed, but installed UHD 3.5.5-1 and gnuradio 3.7.2! (Wow, that's old!) I looked through recent entries in the discuss-gnuradio archives for others' problems, and it seemed that pybombs is using apt-get to install uhd, which then results in an older gnuradio-companion.
On Computer2, it seems I still had an some version of gqrx installed, which hung up the install of libuhd-dev with the "you have held broken packages" message, though the output reported for installing each UHD and GNURadio "Installation Successful" even after the error. Attempting to run gnuradio-companion didn't work, but by this time I figured it would install the wrong version anyway, so I believe I took care of the uhd/gqrx problem, and then ran a "pybombs uninstall gnuradio" on both.
I then added the following changes in ~/.pybombs/config.yml:
config:
  satisfy_order: src, native
packages:
  gnuradio:
    forcebuild: True
  uhd:
    forcebuild: True

On Computer1, I just ran "sudo pybombs install gnuradio".
On Comptuer2, I ran "sudo pybombs install uhd" and then "sudo pybombs install gnuradio".

On Computer2, I got the standard few pybombs install loading bars, and that's it. All seems installed.
On Computer1, I got those loading bars, and then when they were all complete, I then got the long multicolored output from when you either "cmake ..", "make", or "make install" gnuradio from source. This failed at 88% with the following errors:
[ 88%] Built target uhd_swig_gr_uhd_swig_5e3ce
[ 88%] Building CXX object gr-uhd/swig/CMakeFiles/_uhd_swig.dir/uhd_swigPYTHON_wrap.cxx.o
/usr/local/src/gnuradio/build/gr-uhd/swig/uhd_swigPYTHON_wrap.cxx: In function ‘void init_uhd_swig()’:
/usr/local/src/gnuradio/build/gr-uhd/swig/uhd_swigPYTHON_wrap.cxx:45785:91: error: ‘ATR_REG_IDLE’ is not a member of ‘uhd::usrp::dboard_iface’
   SWIG_Python_SetConstant(d, "dboard_iface_ATR_REG_IDLE",SWIG_From_int(static_cast< int >(uhd::usrp::dboard_iface::ATR_REG_IDLE)));
                                                                                           ^
/usr/local/src/gnuradio/build/gr-uhd/swig/uhd_swigPYTHON_wrap.cxx:45786:94: error: ‘ATR_REG_TX_ONLY’ is not a member of ‘uhd::usrp::dboard_iface’
   SWIG_Python_SetConstant(d, "dboard_iface_ATR_REG_TX_ONLY",SWIG_From_int(static_cast< int >(uhd::usrp::dboard_iface::ATR_REG_TX_ONLY)));
                                                                                              ^
/usr/local/src/gnuradio/build/gr-uhd/swig/uhd_swigPYTHON_wrap.cxx:45787:94: error: ‘ATR_REG_RX_ONLY’ is not a member of ‘uhd::usrp::dboard_iface’
   SWIG_Python_SetConstant(d, "dboard_iface_ATR_REG_RX_ONLY",SWIG_From_int(static_cast< int >(uhd::usrp::dboard_iface::ATR_REG_RX_ONLY)));
                                                                                              ^
/usr/local/src/gnuradio/build/gr-uhd/swig/uhd_swigPYTHON_wrap.cxx:45788:98: error: ‘ATR_REG_FULL_DUPLEX’ is not a member of ‘uhd::usrp::dboard_iface’
   SWIG_Python_SetConstant(d, "dboard_iface_ATR_REG_FULL_DUPLEX",SWIG_From_int(static_cast< int >(uhd::usrp::dboard_iface::ATR_REG_FULL_DUPLEX)));
                                                                                                  ^
make[2]: *** [gr-uhd/swig/CMakeFiles/_uhd_swig.dir/uhd_swigPYTHON_wrap.cxx.o] Error 1
make[1]: *** [gr-uhd/swig/CMakeFiles/_uhd_swig.dir/all] Error 2
make: *** [all] Error 2
PyBombs.Packager.source - ERROR - Build failed. See output above for error messages.
PyBombs.Packager.source - ERROR - Problem occured while building package gnuradio:
Build failed.
PyBombs.install - ERROR - Error installing package gnuradio. Aborting.


On Computer2, I get errors when trying to run uhd_<anything>:
uhd_config_info: error while loading shared libraries: libuhd.so.003: cannot open shared object file: No such file or directory

On Computer2, I get the following error when trying to run gnuradio-companion or gnuradio-config-info:
gnuradio-config-info: error while loading shared libraries: libgnuradio-runtime-3.7.10git.so.0.0.0: cannot open shared object file: No such file or directory


How do I correctly install the latest stable version of UHD with GNURadio without having to worry about installing all the dependencies by hand?

Thanks,

Richard
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Richard Bell | 5 Feb 23:59 2016
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Re: DSSS sync question

It will depend on how the rest of the radio is built up. I'm not familiar with VP9, but can I assume it's a spec on bits in a higher layer then Layer 1? Another words, you are assuming you have bits to correlate with, as opposed to wave shapes?

You're getting into the difficulties of radio design now. You need to fully understand the needs of your system to make decisions like this. You don't have bits until you've synchronized and demodulated your signal. If you require some sort of FEC, it will need block alignment before you can decode it, so the correlator will need to be in the waveshape domain. You can still use the known VP9 headers to correlate to in this cas
, but you wouldn't correlate to the bit version, you would correlate to the modulated version of those headers.

P.S. Please reply to the mailing list, so others can see and reply if need be.

Rich



On Fri, Feb 5, 2016 at 2:53 PM, Henry Barton <kw4eg <at> outlook.com> wrote:
I'm hoping to transmit a VP9 transport stream, so perhaps the predictable headers will be enough?

Sent from Windows Mail

From: Richard Bell
Sent: ‎Friday‎, ‎February‎ ‎5‎, ‎2016 ‎5‎:‎51‎ ‎PM
To: Henry Barton, discuss-gnuradio <at> gnu.org

So long as you know what you're looking for in any given scenario, you can use that to correlate to. It can be data or a preamble. If your receiver knows the data will always be a certain way ahead of time though, it's hard to call that data. Semantics at that point.

Rich

On Fri, Feb 5, 2016 at 2:44 PM, Henry Barton <kw4eg <at> outlook.com> wrote:
That sounds great, Richard. But I wonder, what if the useful payload contains that sequence by chance?

Sent from Windows Mail

From: Richard Bell
Sent: ‎Friday‎, ‎February‎ ‎5‎, ‎2016 ‎5‎:‎27‎ ‎PM
To: Henry Barton
Cc: discuss-gnuradio <at> gnu.org

Typically a correlator is used to look for a known sequence of bits, so the radio can align the rest of the processing from the end of this known sequence. This is referred to as frame synchronization. You could use the correlation estimation block to implement something like this. It would place a tag on the stream when it finds your known sequence and you would then know how everything is aligned from then on.

Rich

On Fri, Feb 5, 2016 at 1:04 PM, Henry Barton <kw4eg <at> outlook.com> wrote:
Hi all. I've successfully written a DSSS modulator and demodulator in Windows with a chip rate of 16x. It writes samples to a file that the demodulator can read and despread. Before I try any practical implementations, I need to know how a DSSS stream would be synchronized. Assuming the transmitter and receiver were perfectly clocked in unison, what stops the receiver from tuning in in the middle of a byte, thus getting a nibble from the current byte and a nibble from the next?

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Richard Bell | 5 Feb 23:51 2016
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Re: DSSS sync question

So long as you know what you're looking for in any given scenario, you can use that to correlate to. It can be data or a preamble. If your receiver knows the data will always be a certain way ahead of time though, it's hard to call that data. Semantics at that point.

Rich

On Fri, Feb 5, 2016 at 2:44 PM, Henry Barton <kw4eg <at> outlook.com> wrote:
That sounds great, Richard. But I wonder, what if the useful payload contains that sequence by chance?

Sent from Windows Mail

From: Richard Bell
Sent: ‎Friday‎, ‎February‎ ‎5‎, ‎2016 ‎5‎:‎27‎ ‎PM
To: Henry Barton
Cc: discuss-gnuradio <at> gnu.org

Typically a correlator is used to look for a known sequence of bits, so the radio can align the rest of the processing from the end of this known sequence. This is referred to as frame synchronization. You could use the correlation estimation block to implement something like this. It would place a tag on the stream when it finds your known sequence and you would then know how everything is aligned from then on.

Rich

On Fri, Feb 5, 2016 at 1:04 PM, Henry Barton <kw4eg <at> outlook.com> wrote:
Hi all. I've successfully written a DSSS modulator and demodulator in Windows with a chip rate of 16x. It writes samples to a file that the demodulator can read and despread. Before I try any practical implementations, I need to know how a DSSS stream would be synchronized. Assuming the transmitter and receiver were perfectly clocked in unison, what stops the receiver from tuning in in the middle of a byte, thus getting a nibble from the current byte and a nibble from the next?

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Henry Barton | 5 Feb 22:04 2016

DSSS sync question

Hi all. I've successfully written a DSSS modulator and demodulator in Windows with a chip rate of 16x. It writes samples to a file that the demodulator can read and despread. Before I try any practical implementations, I need to know how a DSSS stream would be synchronized. Assuming the transmitter and receiver were perfectly clocked in unison, what stops the receiver from tuning in in the middle of a byte, thus getting a nibble from the current byte and a nibble from the next?
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Michael Skaggs | 5 Feb 19:40 2016

B200mini USB 3.0 Detection Issues

Hello,

I recently started working with the Ettus B200mini board in GNU Radio and I appear to be having issues with the detection of USB 3.0. The system I am working on is a Dell Latitude E6530 with Ubuntu 14.04. I just yesterday updated to the latest version of GNU Radio and UHD by running the build-gnuradio script.

The issue I am having is when I plug the B200mini into one of the USB 3.0 ports, it is only detected by GNU Radio Companion as USB 3.0 maybe 1 out of 20 times I plug it in, sometimes less often. When it detects as USB 3.0 it is a full speed connection with no issues, when detected at USB 2.0, it is much slower, but appears to work fine.

I am almost 100% certain this is an issue with the B200mini only. I have two of the boards with two different cables, both of them have the detection issue. I also have tried using a B210 multiple times on the laptop with no issues. The B210 never once detected as USB 2.0 when I plugged it in and programmed it through GRC. "lsusb" also detects the USB 3.0 root hub every single time.

Does anyone have any idea what might be going on?

Thanks in advance,
Michael
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Zhihong Luo | 5 Feb 06:39 2016
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Re: Compilation Error of the sample code "tags_demo.cc"

Hi,

I created an OOT module, added the UHD into the required components and added the following lines in the top-level CMakelist.txt and the CMakelist.txt under the apps folder.



The tesr.cc just makes a top_block:  gr::top_block_sptr tb = gr::make_top_block("tags"),
which leads to undefined reference.

If I add another line "gr::uhd::usrp_source::sptr usrp_source = gr::uhd::usrp_source::make(device_addr, uhd::stream_args_t("fc32")); ", the error is:


I think it is a linker problem, but I can not find what I am missing. Is there anyone who could help me fix this?

Thanks,
Zhihong

On Thu, Feb 4, 2016 at 9:34 AM, Zhihong Luo <zhluo <at> umich.edu> wrote:
Hi Tom,

Thank you for the advice. The website seems to be really useful.

Zhihong


2016年2月4日星期四,Tom Rondeau <tom <at> trondeau.com> 写道:
On Wed, Feb 3, 2016 at 8:28 PM, Zhihong Luo <zhluo <at> umich.edu> wrote:
Hi Marcus,

Can you be more specific about what I need to add to the CMakeLists.txt? Because in the <modulename>/apps/CMakeLists.tx, there is no "sources", but only:

include(GrPython)

GR_PYTHON_INSTALL(
    PROGRAMS
    DESTINATION bin
)

And in the <modulename>/CMakeLists.txt, what do you mean by "Add "uhd" to the list"? Is it "find_package(UHD)"? Or things like including ${UHD_INCLUDE_DIRS} ${GR_UHD_INCLUDE_DIRS}
to the directory? I try to learn from the built-in gr-uhd, but there is no apps folder and its CMakeList.txt looks very different. So I was lost.

I am really unfamiliar with these, so more detailed explanation will be much appreciated. Thanks.

Zhihong Luo


We appreciate your enthusiasm for use GNU Radio and building stuff with it. However, the questions you are asking are more related to C++, makefiles, and CMake. I think you'd be better off studying those and learning the basics before asking questions like that here.

Another tactic you can take is to look at all of the projects available on cgran.org as well as look at the GNU Radio source code itself. We have lots of examples out there that you can learn from to do what you want here.

Tom


 
On Wed, Feb 3, 2016 at 3:56 AM, Zhihong Luo <zhluo <at> umich.edu> wrote:
Hi Marcus,

Thank you for the detailed instructions! I'll test it tomorrow and hopefully it can work :) Have a good night.

Zhihong 


2016年2月3日星期三,Marcus Müller <marcus.mueller <at> ettus.com> 写道:
Hi Zhihong Luo,

you're not linking your program against any GNU Radio component, which is why the linker step in your compiler call complains about all the symbols from these libraries missing.
Normally, it's the job of a build system to set up your compiler call correctly, but in this case, somethin like

g++ tags.cpp -o tags $(pkg-config --libs --cflags gnuradio-runtime gnuradio-uhd)

should work.

I'd still recommend not doing that, but using gr_modtool to create a new out-of-tree module

gr_modtool newmod

and add your file in the <modulename>/apps/ folder, adding the filename to <modulename>/apps/CMakeLists.txt under "sources". Add "uhd" to the list of necessary GNU Radio components in <modulename>/CMakeLists.txt

Then, it's the normal CMake build procedure:

cd <modulename>
mkdir build
cd build
cmake ..
make
make install

On 03.02.2016 09:39, Zhihong Luo wrote:
Hi Marcus,

Sorry, I was typing and accidentally sent it out the previous one... The code is 

#include<gnuradio/top_block.h>
#include<gnuradio/uhd/usrp_source.h>
#include<uhd/utils/safe_main.hpp>
#include <boost/make_shared.hpp>
#include <boost/thread/thread.hpp>
#include <boost/program_options.hpp>
#include <csignal>
#include <iostream>

namespace po = boost::program_options;
int UHD_SAFE_MAIN(int argc, char *argv[]){ std::string device_addr =" ";

gr::top_block_sptr tb = gr::make_top_block("tags_demo");

gr::uhd::usrp_source::sptr usrp_source = gr::uhd::usrp_source::make(device_addr, uhd::stream_args_t("fc32"));
}

Then I ran the command:
g++ tags.cpp -o tags -l boost_system

which ends up having errors:

undefined reference to gr::make_top_block, uhd::device_addr_t, gr::uhd::usrp_source and etc.

Thanks,
Zhihong Luo

On Wed, Feb 3, 2016 at 4:29 PM, Zhihong Luo <zhluo <at> umich.edu> wrote:
Hi Marcus,

Of course. Here are the codes:



On Wed, Feb 3, 2016 at 4:13 PM, Marcus Müller <marcus.mueller <at> ettus.com> wrote:
Hi Zhihong Luo,

could you please rather share text than pictures of text, too small for reading?

Best regards,
Marcus


On 03.02.2016 07:31, Zhihong Luo wrote:
Hi all,

I just started to learn to use c++ for gnuradio, and I copied some codes from the "tags_demo.cc". But compilation error occurred as shown in the following screen shots. Can you tell me where I made a mistake?

Thanks,
Zhihong Luo






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Richard Bell | 5 Feb 03:38 2016
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Issue Pybombs2

Hello,

I've been trying to use pybombs2 for the first time to install dependencies on a new computer. I ran into the plex problem someone else reported recently, but the fix there took care of that. Let me be thorough and detail every step anyway. Here is what I did:

1) pip install --pre plex
2) pip install PyBOMBS
3) pybombs recipes add gr-recipes git+https://github.com/gnuradio/gr-recipes.git
4) pybombs recipes add gr-etcetera git+https://github.com/gnuradio/gr-etcetera.git
5) pybombs prefix init /home/rbell/Documents/target -a myprefix
6) pybombs -p myprefix install gnuradio (--deps-only flag preferred but neither way works)

At this point I get the following error:
PyBombs.RecipeListManager - ERROR - Package None has no recipe file!

Any idea what's going on?

Rich
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Daniel Pocock | 4 Feb 17:53 2016

Google Summer of Code / ham radio


Hi all,

GSoC season is about to start again.  I had some ideas about a joint
project between GNU Radio and Debian.

Basically, it would involve one or more students working to combine the
GNU Radio bootable Ubuntu DVD[1] and the Debian Ham Live DVD[2] to
create a ready-to-run transceiver for amateur radio.

My vision for such a project is that any ham can get an old PC or laptop
in the shack, attach one of the common SDR devices and antenna, boot
from the DVD and start operating it like a radio in less than 5 minutes.
 As a first step, it might just be 2m FM but it could evolve to cover
many more bands and modes too.

Something like this is likely to help many more people get their feet
wet and become interested in the GNU Radio community.

Would anybody be interested in promoting something like this to students
or helping to mentor?

The project could potentially be mentored under the umbrella of either
Debian or GNU Radio, so this increases the chance of Google support for
the project.

Regards,

Daniel

1. https://gnuradio.org/redmine/projects/gnuradio/wiki/GNURadioLiveDVD
2. https://www.debian.org/blends/hamradio/get/live
3. https://lists.debian.org/debian-hams/2016/02/msg00002.html

Gmane