Jens Elsner | 28 Apr 11:52 2015

GNU Radio / Software Radio Trainings in Germany

Dear GNU Radio community,

we are happy to announce that Fennec Research in cooperation with 
Munich Innovation Labs is offering GNU Radio User & Developer Trainings 
in Germany!

Date: August 6, Thursday to August 7, Friday, 2015
Venue: Bremen, Germany
Goal: Independent development and application of GNU Radio 
communication systems

To sign up or request further information, please visit 
http://www.munich-innovation-labs.com/training/ .

Best regards,
Jens
Carl Olsson | 28 Apr 01:41 2015
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Is it possible to undo my mistake

Dear all,

I followed a tutorial online to install a sdr software and accidentaly deleted files from my gnuradio installation. It took me a very long time to manage to set up everyting so before I start from the beginning I wanted to ask you if it is possible to undo my mistake. I am on Ubuntu 14.04 LTS and did:
cd user/local/lib
sudo rm libgnuradio*

Now when I run gnuradio-companion I get:

Cannot import gnuradio.

Is the python path environment variable set correctly?
    All OS: PYTHONPATH

Is the library path environment variable set correctly?
    Linux: LD_LIBRARY_PATH
    Windows: PATH
    MacOSX: DYLD_LIBRARY_PATH

Thank you all!
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Anderson, Douglas J. | 28 Apr 00:03 2015

Confirming uhd.set_command_time is working

Hi all,

I'm playing around with timed commands on the USRP, but I'm not sure I understand them correctly.

I've got a usrp connected as "u" and set to center freq 700e6.

>>> u.set_command_time(u.get_time_now() + uhd.time_spec(2)); u.set_center_freq(800e6); u.clear_command_time(); print(u.get_center_freq()); time.sleep(2); print(u.get_center_freq())
-- Successfully tuned to 800.000000 MHz
-- 
<gnuradio.uhd.uhd_swig.tune_result_t; proxy of <Swig Object of type '::uhd::tune_result_t *' at 0x7f1b75a3b930> >
800000000.0
[... 2 second pause is here ...]
800000000.0

It looks like it's changing the freq immediately... but I'm assuming as usual there's more than meets the eye to this command. Any hints?

-Doug
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Marcus Müller | 27 Apr 18:27 2015

Re: Multiple flowgraphs and GUI elements

Ok, this boils down to one thing:

The flow graph you're doing doesn't really have logically "separate" RX and TX parts.
Just put it all in one big GRC file and you should be set; do you encounter any problems when doing that?

Greetings,
Marcus
On 04/27/2015 06:25 PM, Nemanja Savic wrote:
Hi,

Yes, I think of that example, wihch could be found in gr-uhd/examples/python/usrp_nbfm_ptt.py
The problem that I don't uderstand is how to cope with GUI elements like WX GUI FFT. It should be connected with other elemetns inside hier block, but also to be added into the grid of top block. So my question was about how to make that. After I instantiate them and connect inside hierblock, should I only call GridAdd() method from the topo block?

Thanx a lot
Nemanja

On Mon, Apr 27, 2015 at 5:40 PM, Marcus Müller <marcus.mueller <at> ettus.com> wrote:
So you mean this one:
http://gnuradio.org/redmine/projects/gnuradio/wiki/TutorialsWritePythonApplications#Multiple-flow-graphs

That refers to the Push-to-talk example from gr-uhd, which is a bit older, I think.
However, the whole point is that you can simply write your TX flow graph and your RX flow graph as hierarchical blocks of their own, for example graphically using GRC, or like in that Tutorial in python. Then you just use these hier_block2 's in your "overall flow graph".

The graphical sinks must be placed at the point where the samples flow that you want to visualize, hence I don't understand that part of the question; I do think you're on to something, so could you please elaborate?

Best regards,
Marcus


On 04/27/2015 05:07 PM, Nemanja Savic wrote:
The one suggested for multiple flowgraphs in the gnuradio page Writing python applications. Walkie talkie nbfm example (can't provide the name at the moment).

Best,
Nemanja

On Mon, Apr 27, 2015 at 2:23 PM, Marcus Müller <marcus.mueller <at> ettus.com> wrote:
Hi Nemanja

On 04/27/2015 01:18 PM, Nemanja Savic wrote:
> Hi all guys,
and girls :)
>
> I am building a gnuradio top block application where I want to have rx
> and tx flographs. Something similar to the example provided with gnuradio.
Which one of the dozens of examples?

Greetings,
Marcus

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Su Li | 27 Apr 15:26 2015
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Polyphase Clock Synchronization with Matched Filter

Hi all,

I am trying to use Polyphase Clock Synchronization (PCS) block to conduct timing synchronization for QPSK signal with half-sine pulse shaping. In the doxygen document of PCS, it says that the "taps" parameter could be the matched filter. Thus, I put the matched filter of half-sine pulse here, [0,sin(pi/4),1,sin(3*pi/4)]. However, the output is all 0. 

Is there anyone knows how to generate the "taps" parameter here?  Any suggestion would be appreciated. Thanks in advance.

Best regards,

Su Li

PS: here is my configuration for other parameters.

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Nemanja Savic | 27 Apr 13:18 2015
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Multiple flowgraphs and GUI elements

Hi all guys,

I am building a gnuradio top block application where I want to have rx and tx flographs. Something similar to the example provided with gnuradio. I want to make rx path and tx path, but the example doesn't use "common" way for making GUI elements. Now, I am a little bit confused. Should GUI elements be part of rx and tx path while in the top block, I should only add them using Add or GridAdd methods?

Thanx

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THEMBA WELCOME MATHUMO | 27 Apr 08:43 2015
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python Hier block using callback

Hi all;

I created a python hier block using signal source and a VCO, but  I want to be able to control parameters like amplitude, sensitivity etc il real time using sliders.

I used callback tag on xml together with the set method but it does not work, the parameters does not seem to change at all.

is it possible to achieve what I am trying to do? how can I do it.

your help will be much appreciated.

Regards

Fanatic
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Ralph A. Schmid, dk5ras | 27 Apr 07:43 2015

No scope with gr?

Hi,

With latest gnuradio the scope view refuses to work in my flowgraphs.
Execution ends completely without any error message. Removing the block and
putting it newly into the flowgraph changes nothing. Disabling the scope
makes the projects work, the water fall works without issues. 

Uninstalling gnuradio, deleting the build folder and rebuilding everything
changed nothing. All elements are built, cmake seems to be fine with the
prerequisites, still no working scope.

Kubuntu 14.04 64 bit, latest kernel and all other updates, gnuradio from
sources (master), no pybombs...

Where can I start searching for the reason?

Thx!

Ralph.
Yile Ku | 26 Apr 04:11 2015
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Module not showing up in companion

I have built a custom source module.  I followed the steps for coding and did a make, make test, make install.  Then I did the gr_modtool makexml my_mod, and a 'make install again.  I can see the module in /usr/local/share/gnuradio/grc/blocks/my_mod.xml.  When I run gnuradio-companion I can find the module when I search.  I am running gnuradio-companion 3.7.6.1.

Thanks,
Y-
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Gerome Jan L | 25 Apr 22:40 2015
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Re: UHD: USRP Source (Gerome Jan L)

Hello,


What I was trying to say is, how related is the sampling rate in the uhd: usrp source to the sampling rate in the adc which is 100MSPS? Thanks.



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Mostafa Alizadeh | 25 Apr 18:52 2015
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Re: Multipath Fading

I think this block is just a single tap channel. If you want to have multipath channel use channel_model2 instead: 


Best, 
Mostafa

On Sat, Apr 25, 2015 at 8:44 PM, Ritvik Pandey <pandey.ritvik <at> gmail.com> wrote:
Okay ill work on this and get back to you if i face any problems...for now one last thing according to the theory fading is a result of multipath so does this block implements multipath and then shows the faded result or it just filters the fading output of an input signal.


On Sat, Apr 25, 2015 at 9:41 PM, Mostafa Alizadeh <m.alizadehee <at> gmail.com> wrote:

The frequency measurement doesn't give any insight rather to see just time variation of the power of the signal (i think you're using a single tone source ). I prefer to plot the singal in time domain to see fading effects.

The fading block has different parameters as said:
http://gnuradio.org/doc/doxygen/classgr_1_1channels_1_1fading__model.html

Set like this:
N = 8
FTds = .01
LOS = false
K = 4
Seed = 1

On Apr 25, 2015 8:27 PM, "Ritvik Pandey" <pandey.ritvik <at> gmail.com> wrote:
See i am using a signal source and fast noise source as inputs...adding these it passes through the fading block and then towards the fft sink or waterfall sink. 

Input Parameters in signal source: 
Freq: 1 M
Amplitude: 1

Noise Source:
Amplitude: 1

Fading Block:
Normalized Doppler: 10.0
Rayleigh

This for testing the fading block initially in the final stage i have to take the signal from usrp.



On Sat, Apr 25, 2015 at 9:23 PM, Mostafa Alizadeh <m.alizadehee <at> gmail.com> wrote:

What is the input of the gnuradio's block you've set??
I think you're using the gnuradio's block wrongly!

Dear Mostafa,

I have tried making a flowgraph using the fading blocks, but i am not able to understand the output. I have compared the input and output it seems almost the same. Can you guide to the mathematical model of the fading block in gnu radio, so that i can understand what actually is happening to the input signal?

Regards

On Sat, Apr 25, 2015 at 9:07 PM, Mostafa Alizadeh <m.alizadehee <at> gmail.com> wrote:
Hi Ritvik,

If you have enough background knowledge you need classify channels as follow:

1) Rician channel: which has a line-of-sight(LOS) path between a transmitter and a receiver.
2) Rayleigh fading channel: which doesn't have any LOS. 
3) Something between Rayleigh and Ricean channel: using Nakagami distribution with parameter K varying 0-inf.

You need to first generate samples of these distributions.


On Sat, Apr 25, 2015 at 4:06 PM, Ritvik Pandey <pandey.ritvik <at> gmail.com> wrote:
Regarding my last post i want to bring it to your notice that i have to implement a multipath fading channel emulator so can you tell me how can i do that?

On Sat, Apr 25, 2015 at 5:03 PM, Ritvik Pandey <pandey.ritvik <at> gmail.com> wrote:
Dear Sir/Mam,

Hello, i am a student working on the development of a channel emulator, Can you tell me how can you make one in GNU Radio?



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