[Discuss-gnuradio] Is anyone within RF range of a P25 Phase 2 system?

[Matt Robert]

Hi all,

Is there anyone within range of a P25 Phase 2 system, that has access
to a USRP? I would like to get some complex baseband captures from
this system.

Cheers,
Matt

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Re: [Discuss-gnuradio] issue with GRC on ubuntu 12.10 - Segmentation Fault when launching the tool

[Josh Blum]

On 10/18/2012 05:49 PM, Arturo Rinaldi wrote:
> After successfully building gnuradio 3.6.2 on *ubuntu quantal quetzal
> 12.10* i get this error when launching gnuradio-companion :
> /*
> *//*artynet@artynet-VirtualBox:/usr/local/bin$ gnuradio-companion */
> /*Traceback (most recent call last):*//*
> *//*  File "/usr/local/bin/gnuradio-companion", line 58, in *//*
> *//*from gnuradio.grc.python.Platform import Platform*//*
> *//*  File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/grc/python/Platform.py", line
> 22, in *//*
> *//*from .. base.Platform import Platform as _Platform*//*
> *//*  File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/grc/base/Platform.py",
> line 22, in *//*
> *//*from .. base import ParseXML, odict*//*
> *//*  File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/grc/base/ParseXML.py",
> line 20, in *//*
> *//*from lxml import etree*//*
> *//*  File "lxml.etree.pyx", line 67, in init lxml.etree
> (src/lxml/lxml.etree.c:160085)*//*
> *//*  File "/usr/lib/python2.7/io.py", line 51, in *//*
> *//*import _io*//*
> *//*TypeError: type '_io._IOBase' participates in gc and is a base type
> but has inappropriate tp_free slot*//*
> *//*Segmentation Fault (core dump created)
> 

The error seems to be entirely from lxml. So I would guess that this is
an lxml issue not gnuradio related. Can you try to run python -c "from
lxml import etree" and see if the error happens?

-josh

> */I satisfied all the required dependencies with the build-gnuradio
> script by SBRAC. Any ideas to solve this issue, it never happened to me
> in any build of GNURadio from stable tarball. Do I have to install some
> other python package ?
> 
> Thank you in advance
> 
> Kind Regards
> 
>   Arturo
> 
> 
> 
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Re: [Discuss-gnuradio] Blocks missing from GRC after pre-cog installation

[Josh Blum]

On 10/18/2012 11:07 AM, Sakib Chowdhury wrote:
> Hi,
> 
> Unfortunately reinstalling didn't solve the problem. I tried twice already.
> What I did is first I removed all relevant gnuradio and uhd files and
> folders from /usr/* folders and installed gnuradio, uhd, grextras using the
> script linked on gnuradio.org website:

Would you perhaps have multiple installs of gnuradio both in /usr and
/usr/local? That could be one issue

Also, while its ok to put gnuradio in /usr and grextras and pre-cog into
/usr/local. You will need to set the GRC_BLOCKS_PATH environment
variable to have entries for both block paths. The paths would be
your_install_prefix/share/gnuradio/grc/blocks

-josh

> http://www.sbrac.org/files/build-gnuradio . I opened GRC and found some
> newer blocks (obviously because of some updates to the source) along with
> my previously missing blocks. So, everything is fine. Then I installed
> pre-cog using the set of commands at the end of the page:
> https://github.com/buoyboy/pre-cog/wiki/Installation . After that I opened
> GRC and blocks that start with gr_*.xml are gone.
> 
> Please let me know if I'm doing something wrong with the installation.
> Isn't pre-cog supposed to be installed in this way? Or if pre-cog is
> required, I have to install gnuradio in some other way apart from using
> that script?
> 
> Thanks.
> 
> 
> On Wed, Oct 17, 2012 at 5:32 PM, Johnathan Corgan
> wrote:
> 
>> On Wed, Oct 17, 2012 at 2:30 PM, Sakib Chowdhury 
>> wrote:
>>
>>
>>> I noticed that actually all block files (xml) are still there
>>> in /usr/local/share/gnuradio/grc/blocks/ . What GRC is not displaying are
>>> the blocks whose names start with gr_*.xml . I'll try to reinstall.
>>>
>>
>> This was a recently fixed bug on GNU Radio master branch, related to the
>> gr-blocks work Josh mentioned.
>>
>> Johnathan
>>
>>
> 

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[Discuss-gnuradio] issue with GRC on ubuntu 12.10 - Segmentation Fault when launching the tool

[Arturo Rinaldi]

After successfully building gnuradio 3.6.2 on *ubuntu quantal quetzal 
12.10* i get this error when launching gnuradio-companion :

/*
*//*artynet@artynet-VirtualBox:/usr/local/bin$ gnuradio-companion */
/*Traceback (most recent call last):*//*
*//*  File "/usr/local/bin/gnuradio-companion", line 58, in *//*
*//*from gnuradio.grc.python.Platform import Platform*//*
*//*  File 
"/usr/local/lib/python2.7/dist-packages/gnuradio/grc/python/Platform.py", line 
22, in *//*

*//*from .. base.Platform import Platform as _Platform*//*
*//*  File 
"/usr/local/lib/python2.7/dist-packages/gnuradio/grc/base/Platform.py", 
line 22, in *//*

*//*from .. base import ParseXML, odict*//*
*//*  File 
"/usr/local/lib/python2.7/dist-packages/gnuradio/grc/base/ParseXML.py", 
line 20, in *//*

*//*from lxml import etree*//*
*//*  File "lxml.etree.pyx", line 67, in init lxml.etree 
(src/lxml/lxml.etree.c:160085)*//*

*//*  File "/usr/lib/python2.7/io.py", line 51, in *//*
*//*import _io*//*
*//*TypeError: type '_io._IOBase' participates in gc and is a base type 
but has inappropriate tp_free slot*//*

*//*Segmentation Fault (core dump created)

*/I satisfied all the required dependencies with the build-gnuradio 
script by SBRAC. Any ideas to solve this issue, it never happened to me 
in any build of GNURadio from stable tarball. Do I have to install some 
other python package ?


Thank you in advance

Kind Regards

  Arturo
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[Discuss-gnuradio] obtaining duration of Idle and busy cycles

[Sahoo, Anirudha]

Hi,
  I am trying to use "usrp_sprectrum_sense.py" to obtain
Idle (white space) and busy cycles of a channel (say channel 1
of WiFi).
  I was thinking of doing it the following way:
Continuously get the FFT (and hence power in db) of
center frequency of channel 1. Whenever the power is
very low (below a threshold), assume the channel was
idle, otherwise channel was busy.
  Let us say, I found that 10 consecutive fft readings indicated
that channel was idle, can I assume that the corresponding
idle period was 10xtime to get one FFT reading? Is "time to get one
FFT reading" equal to "dwell_delay"? If not, what is its value?
  If the above method is not accurate/correct, any other method
which would work?
  Thanks

-Anirudh
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Re: [Discuss-gnuradio] Blocks missing from GRC after pre-cog installation

[Sakib Chowdhury]

Hi,

Unfortunately reinstalling didn't solve the problem. I tried twice already.
What I did is first I removed all relevant gnuradio and uhd files and
folders from /usr/* folders and installed gnuradio, uhd, grextras using the
script linked on gnuradio.org website:
http://www.sbrac.org/files/build-gnuradio . I opened GRC and found some
newer blocks (obviously because of some updates to the source) along with
my previously missing blocks. So, everything is fine. Then I installed
pre-cog using the set of commands at the end of the page:
https://github.com/buoyboy/pre-cog/wiki/Installation . After that I opened
GRC and blocks that start with gr_*.xml are gone.

Please let me know if I'm doing something wrong with the installation.
Isn't pre-cog supposed to be installed in this way? Or if pre-cog is
required, I have to install gnuradio in some other way apart from using
that script?

Thanks.


On Wed, Oct 17, 2012 at 5:32 PM, Johnathan Corgan
wrote:

> On Wed, Oct 17, 2012 at 2:30 PM, Sakib Chowdhury 
> wrote:
>
>
>> I noticed that actually all block files (xml) are still there
>> in /usr/local/share/gnuradio/grc/blocks/ . What GRC is not displaying are
>> the blocks whose names start with gr_*.xml . I'll try to reinstall.
>>
>
> This was a recently fixed bug on GNU Radio master branch, related to the
> gr-blocks work Josh mentioned.
>
> Johnathan
>
>
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[Discuss-gnuradio] Europe to update radio equipment rules.

[Andrew Back]

Hello List,

On first inspection this doesn't look like good news:

  http://europa.eu/rapid/press-release_IP-12-1109_en.htm

Anyone have any further insight or views?

Cheers,

Andrew

-- 
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http://carrierdetect.com

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[Discuss-gnuradio] Auto Response

[Bilal]

Asalam O Alaykum
It is an Automatic generated response,your email has been received and will be 
answered soon.
Regards
Bilal Nasir.




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Re: [Discuss-gnuradio] OFDM MODULATION/DEMODULATION PROBLEM

[Josh Blum]

On 10/18/2012 04:47 AM, Bilal wrote:
> Hi
> I m using USRP2 and USRPN210 DB RFX900.
> 
> Block diagram
> MOD:random source-->ofdm-->usrp sink
> DeMOD:usrp source-->ofdm demod-->>sink scope,fft
> 
> Problem is that:
> Modulation is going fine,even at the receiver end the spectrum is just like
> it should be (block for OFDM )
> but there is nothing at the output of OFDM demod block Sink Scope is showing
> nothing.  
>  
>  
> I have attached the mod,demod,received spectrum snaps.
> Help is highly appreciated...:-) 
> 

1 few things:

1) Remove the throttles, the sample rate is already throttled by the
usrp. There will be a fight.

2) I see an exception printed in the GRC window for one of the
screenshots. That might be important to share?

3) The random source should probably be 0 to 1 << 32. I believe thats a
32 bit integer stream. Things might not work as expected when the input
bits are mostly 0.

-josh

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Re: [Discuss-gnuradio] Quick & Dirty for Beginners

[sumitstop]

Thanks for appreciation Mark 



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Re: [Discuss-gnuradio] Quick & Dirty for Beginners

[sumitstop]

Thanks Tom.



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[Discuss-gnuradio] Quick & Dirty for Beginners

[Mark]

Thank you Sumit.

 

I very much appreciated your excellent resource.

 

Many thanks again,

 

Mark

 

 

 


 

cid:image001.png@01CD5F92.9D5CA1D0

mark G. Hopewell RGN; BSc (Hons)


785-458-6100 (m)

 

CQ - M0XMH


  https://markhopewell.wordpress.com/

 

 

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Re: [Discuss-gnuradio] Quick & Dirty for Beginners

[Tom Rondeau]

On Thu, Oct 18, 2012 at 9:16 AM, sumitstop
 wrote:
> Thanks Martin for including the links. I just now made the account on
> gnuradio.org ,
> username : sumitstop
> mail id : sumit.ku...@research.iiit.ac.in
> Kindly add me as contributor.

Done. You should be able to edit and add to the Wiki.

Tom

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Re: [Discuss-gnuradio] Quick & Dirty for Beginners

[sumitstop]

Thanks Martin for including the links. I just now made the account on
gnuradio.org , 
username : sumitstop
mail id : sumit.ku...@research.iiit.ac.in
Kindly add me as contributor.




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[Discuss-gnuradio] OFDM MODULATION/DEMODULATION PROBLEM

[Bilal]

Hi
I m using USRP2 and USRPN210 DB RFX900.

Block diagram
MOD:random source-->ofdm-->usrp sink
DeMOD:usrp source-->ofdm demod-->>sink scope,fft

Problem is that:
Modulation is going fine,even at the receiver end the spectrum is just like
it should be (block for OFDM )
but there is nothing at the output of OFDM demod block Sink Scope is showing
nothing.  
 
 
I have attached the mod,demod,received spectrum snaps.
Help is highly appreciated...:-) 

Regards:
Bilal Abbasi
COMSATS IIT Islamabad
Pakistan.



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Re: [Discuss-gnuradio] Quick & Dirty for Beginners

[Martin Braun (CEL)]

On Wed, Oct 17, 2012 at 03:40:28PM -0700, sumitstop wrote:
> Thanks for the appreciation Tom !! 
> Will keep these basic things posting...
> btw whom shall I contact so that these links get included on gnuradio.org 

Hi Sumit,

you (and everyone else) can submit stuff yourself to the GNU Radio web
site, it's all explained here:
http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#How-can-I-post-on-this-wiki-use-the-bug-tracker

I've already added your blog (and, previously, your YouTube channel),
but that shouldn't discourage you to still sign up.

MB

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Phone: +49 721 608-43790
Fax: +49 721 608-46071
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