[Discuss-gnuradio] Does GRAS support setting max noutput_items?

[Devin Butterfield]

Hi folks,

I just started experimenting with GRAS and ran into this:

>>> GRAS: The debug asserts are enabled. <<<
Created default thread pool with 4 threads.
Traceback (most recent call last):
  File "top_block.py", line 80, in 
tb.Run(True, 10)
  File
"/opt/gnuradio/lib/python2.7/dist-packages/grc_gnuradio/wxgui/top_block_gui.py",
line 76, in Run
self.start(max_nouts)
TypeError: start() takes exactly 1 argument (2 given)

Is this feature broken?

Thanks.
--
Regards, Devin
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[Discuss-gnuradio] ATSC fixups

[Andrew Davis]

Hello all,

I have been working on getting gr-atsc running again, I have found a few
speedups and some bugs that prevented ATSC decoding from working with new
versions of GNURadio. I have put these fixes into a branch that can now
decode signals from my local TV station. The changes are in commit in this
branch: https://github.com/glneo/gnuradio/tree/atscfixup

Thank you
Andrew
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Re: [Discuss-gnuradio] Does GRAS support setting max noutput_items?

[Josh Blum]

On 07/14/2013 02:43 PM, Devin Butterfield wrote:
> Hi folks,
> 
> I just started experimenting with GRAS and ran into this:
> 
 GRAS: The debug asserts are enabled. <<<
> Created default thread pool with 4 threads.
> Traceback (most recent call last):
>   File "top_block.py", line 80, in 
> tb.Run(True, 10)
>   File
> "/opt/gnuradio/lib/python2.7/dist-packages/grc_gnuradio/wxgui/top_block_gui.py",
> line 76, in Run
> self.start(max_nouts)
> TypeError: start() takes exactly 1 argument (2 given)
> 
> Is this feature broken?
> 

Yea, Its in the block config that can be set at the global config level
or the block level, or the port level.

https://github.com/guruofquality/gras/blob/master/include/gras/block_config.hpp

https://github.com/guruofquality/gras/blob/master/include/gras/top_block.hpp#L24

https://github.com/guruofquality/gras/blob/master/include/gras/block.hpp#L42

Its also available in the wrapper set set_max_noutput_items on the
blocks, it just didnt get into the second parameter for the run/start
API calls. I can add it...

Just curious... What are you trying to do at a high level? Constrain the
available buffer that a block can produce (without upstream consuming)?
Constrain the maximum number of items in a single call to work? etc..

-josh

> Thanks.
> --
> Regards, Devin
> 
> 
> 
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[Discuss-gnuradio] Reg:Error check explanation

[manjusha]

Hi,

I am looking for some kind of explanation on how the transmitter and
receiver are synchronized and how are the errors checked before the signal
is being demodulatedWhere can I find these information?Please state the
links..

Thanks for your help!!



-
Manjusha
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[Discuss-gnuradio] Doppler Radar Processing

[Wallace, Frank L CIV NSWCDD, Q41]

Has anybody done Doppler Radar Processing in GNU Radio Companion?
Currently, I am just saving off the data and then processing it in 
Octave/Matlab. It would be nice to have a display of the range/Doppler map that 
is updated periodically within GRC.  This would give me a good indication that 
everything is working without me having to save off the data and load it into 
matlab.  I am fairly new to GNU Radio and the GRC and it is the plots that I 
really don't know how to do.  So, does anyone have something like a 2D Mesh 
plot in QT that I could update semi-real time?

Thanks,
Frank Wallace


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[Discuss-gnuradio] Simple WBFM Transmitter - How to configure the USRP1 block to transmit ?

[Bruno Cardoso]

Hello guys,


I did the FM receiver (WBFM) based on the link bellow. It's working good. I
can tune the local FM stations.

http://www.youtube.com/watch?v=KWeY2yqwVA0


1) Now I'm trying to build the FM transmitter. My model is attached to the
email. It seems it's working because I can see the graphical sink. 


2) My major doubt is about how to use the ''UHD: USRP Sink'', because it's
dificult to test this block. I don't know if I set the parameters correctly.


3) The ''UHD: USRP Sink'' block is different in:
http://www.dl8rds.de/index.php/Datei:GnuRadio_USRP2_FM_TRX.jpg. The  ''USRP
Sink'' block in this example has additional options like: ''Interpolation,
''Side'', ''Transmitt''. Is my ''UHD: USRP Sink'' updated or outdated ?

4) I don't know if we have to use diferent blocks for USRP1 or USRP2. Do we
have to use ?


5) The center frequency I'm trying to send the signal is the 105,5 MHz. I
think I'm receiving the carrier 105,5 MHz, because I can hear a tone and see
a signal peak centered in 105,5 MHz in the graphic in the  FM receiver
model.



Thanks for any clue.

Regards,

Bruno Cardoso

WBFM_transmitter_Bruno.grc
  



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Re: [Discuss-gnuradio] Doppler Radar Processing

[Jean-Michel FRIEDT]

in case you are interested in such a related topic
http://jmfriedt.free.fr/poster_12906.pdf
I have not made an archive of all the related boxes and GRC graphs but this
might be an opportunity to do so.

JM


Has anybody done Doppler Radar Processing in GNU Radio Companion?
Currently, I am just saving off the data and then processing it in  
Octave/Matlab. It would be nice to have a display of the  
range/Doppler map that is updated periodically within GRC.  This  
would give me a good indication that everything is working without  
me having to save off the data and load it into matlab.  I am fairly  
new to GNU Radio and the GRC and it is the plots that I really don't  
know how to do.  So, does anyone have something like a 2D Mesh plot  
in QT that I could update semi-real time?


Thanks,
Frank Wallace





--
JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 32 av. observatoire,  
25044 Besancon, France



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