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Mulitple USRP Stream Confusion

Hello!

I am having trouble trying to create a continuous stream of complex shorts from multiple (2) X310 USRPs (each running 2 channels) over a single 1gigE switch (at a very low sampling rate); currently it appears as though I can only stream from one USRP at a time and I can't seem to figure out why. I should note I don't have this problem running each USRP on its own dedicated network (but unfortunately that won't be possible moving forward).

To date, I have been using the rx_multi_samples example provided with UHD (source 003.007.002). I don’t seem to have any issue connecting to both USRPs and setting the parameters via the args=”addr0=192.168.10.2, addr1=192.168.10.3” command. It is just that when I call rx_stream->recv only the lights on the USRP which was listed first in args turn on.
The subdev spec and channel selection for each USRP is set to "A:A B:A" and "0,1" and the incoming data from rx_stream is two channels of complex shorts (not 4 like I would expect from 2 USRPs).

Do I have to initiate the streams differently or am I missing something?

Thanks!

-Andrew
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Jeff Long | 29 Sep 22:59 2014
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Re: How to import in Gnu Radio IQ.wav files recorder with SDR#?

You need an ishort-to-complex block after the file source. The file 
source does not convert for you. If that doesn't work and your data is 
definitely good (and not too short), then no idea.

Please send replies to the list.

- Jeff

On 09/29/2014 04:53 PM, Θανάσης Μπαλαφούτης wrote:
> The IQ.wav file is indeed 16-bit signed, 2 channels, but it has sample
> rate=192000 (FCDpro+)
> I want to get the Complex output (Audio output is always Float).
> My setup is:   fileSource -----> Throttle ------>wx fft sink.
>
> Still get nothing
>
> Thanassis
>
>
> 2014-09-29 23:31 GMT+03:00 Jeff Long <willcode4 <at> gmail.com
> <mailto:willcode4 <at> gmail.com>>:
>
>     Make sure you have a throttle block between the source and the FFT,
>     set to the rate at which you captured the wav. Also, there is a Wav
>     File Source under Audio. The plain File Source will also work
>     (usually WAV is 16-bit signed, 2 chan), but will have a little noise
>     at the beginning (the wav header).
>
>     - Jeff
>
>
>     On 09/29/2014 04:09 PM, Θανάσης Μπαλαφούτης wrote:
>
>         Hi,
>         I have recorded with FCD pro+ and SRD# some IQ.wav files.
>         When I try to import them in Gnu Radio companion as a "File
>         source" and
>         plot the frequency spectrum with the "FFt sink" I get nothing.
>         Are the IQ.wav files produced by the SDR# recognizable from the
>         Gnu radio?
>
>         Thanks!
>
>
>         _________________________________________________
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>         <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
>
>
>
>     _________________________________________________
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>     https://lists.gnu.org/mailman/__listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
>
>

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New to Gnuradio, couple of questions

I'm trying to become familiar with gnuradio, starting with grc, but I've run into a couple of stumbling blocks.

I'm using a USRP1 with an assortment of daughter boards, including LF-HF and VHF capabilities. I'd like to be able to sample the spectrum in relatively small segments, and capture the sample to a file, for particular amplitude exceedances. To be specific, I'm looking at lightning impulses and attempting to capture narrow segments of its discharge spectrum for analysis. Most of this will be below 100 khz, although I'm interested in systematically sampling from 10khz to 1 MHz. Of I can capture sufficient samples, I'll perform wavelet and FFT analyses against them, to see if I can identify patterns.

Could someone spare a clue to a new guy, and point me either toward an appropriate starting point in Python, or a good place to start in a grc flowgraph? 

Regards,
Gerry
--
Gerry Creager
N5JXS
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How to import in Gnu Radio IQ.wav files recorder with SDR#?

Hi,
I have recorded with FCD pro+ and SRD# some IQ.wav files.
When I try to import them in Gnu Radio companion as a "File source" and plot the frequency spectrum with the "FFt sink" I get nothing.
Are the IQ.wav files produced by the SDR# recognizable from the Gnu radio?

Thanks!
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Sebastian Koslowski | 29 Sep 20:24 2014

[GRCWG] Call on October 1

Hey,

the GRC Working Group is meeting on October 1 2014, 7pm CEST.
I have added an event+hangout on G+. Agenda (and Notes) can be found in
the wiki [0]

Sebastian

[0] http://gnuradio.org/redmine/projects/gnuradio/wiki/Call20141001

-- 
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

Dipl.-Ing. Sebastian Koslowski
Research Associate

Kaiserstraße 12
Building 05.01
76131 Karlsruhe, Germany

Phone: +49 721 608-46275
Fax:   +49 721 608-46071
Email: sebastian.koslowski <at> kit.edu
Web:   http://www.cel.kit.edu/

KIT – University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association

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George Nychis | 29 Sep 20:01 2014
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CGRAN down indefinitely, but hopefully not for long (want feedback)

The machine that runs CGRAN down in some basement somewhere at Carnegie Mellon has hit some issues again.  Given that I'm no longer at the university, these issues are becoming harder for me to address.  At this point, it's probably best for CGRAN to "move on" as we've all been in discussion about over time.  

What I can do if everyone still finds CGRAN useful is:

   1.  Provide a more reliable host and machine for it
   2.  Update it to be more useful to the community (e.g., more towards git)

It still gets a lot of hits (~16,000 a month) and every time it goes down people hunt me down and ask when it's coming back up.  So it seems as though the community still uses it.

I can update it with Pybombs or Gitlib or whatever people feel is appropriate.  It can be more of a portal page even, without a repository if most people just use Github now anyway.  Do people still like it is a standalone service, or is it better to just "roll it in" to the GNU Radio webpage somewhere now?  I want to do whatever the community finds is most useful.

Thanks!
George
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Simone Ciccia S210664 | 29 Sep 16:39 2014
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Small example - using UHD function

Hello everyone,
It's a bit of time that I try to use the functions of class UHD, but
unfortunately without success.

I have prepared a small example in which you can reproduce the error
obtained when launching the simulation.

Since it makes use of gr-802.11 you need to install this library,
and also install the block that I created, folder gr-test_simone attached
here, the name of the code is using_uhd.
In short, this block should work as an AGC, in particular it reads the gain
from the USRP, processes, and writes the new value.
I would be very grateful if someone with a little patience can correct me
where I'm wrong!

-> Settings for using_uhd block,
alpha = damping constant = 0.001
reference = allowed_ADC_range^2 = 0,025 half dynamic  (full dynamic is 1)

obtained error:
__________________________________________________________________________
Traceback (most recent call last):
  File "/home/simone/Scrivania/top_block.py", line 238, in <module>
    tb = top_block(address=options.address)
  File "/home/simone/Scrivania/top_block.py", line 76, in __init__
    self.test_simone_using_uhd_0 = test_simone.using_uhd(0.001, 0.025)
AttributeError: 'module' object has no attribute 'using_uhd'
__________________________________________________________________________

I think that the problem is how I use address in using_uhd_impl.cc when I
call the "sptr = make"!

Cordially,
Simone Ciccia
Attachment (example.grc): application/octet-stream, 51 KiB
Attachment (gr-test_simone.tar.gz): application/x-gzip, 812 KiB
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Murray Thomson | 29 Sep 00:26 2014
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Fwd: QT sink in xmlrpc client

Hi,

I have gnuradio running in a device with no gui. I've added a xmlrcp_server to that computer and a xmlrpc_client to my desktop to control the variables. I would like to add a QT GUI Sink to visualize data in the client. Could anyone tell me if this is possible and point me to the related documentation please.

Thank you for your help,
Murray

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Engin Karabulut | 29 Sep 00:22 2014
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Incrementing variable value in every cycle

Hi everyone,

I'm playing with gr-ieee802-11 wifi_loopback example, I want to change 
some variable values in every cycle, but i cannot find any way to do 
this. Is it possible with gnuradio-companion?

regards. 
Rachel Michelson | 27 Sep 20:24 2014

clean uninstall of Gnuradio and Pybombs

Hello all,
I am very new to gnuradio, so please excuse a basic question.
I managed to install pybombs and gnuradio on my Ubuntu platform in 
several attempts. Various permissions issues got in the way and I ended 
up with multiple copies of the software in different directories, some 
more complete than others. Is there a clean way to uninstall the 
software and start from scratch?
Is doing a recursive rm on these extra directories sufficient or is 
there more to removing the packages?
Where do people typically install, under /usr/local? If so, all 
subsequent uses of pybombs and gnuradio require sudo? If using pybombs, 
will the entire gnuradio package also be under the pybombs directory 
tree?

thank you in advance!
Rachel
ANKIT KHUSHU | 26 Sep 22:19 2014
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SNR Peak AMplitude and Noise Floor Calculation

My question is if we have an incoming signal coming from a usrp, How do
> I calculate the SNR, Peak Amplitude of the signal and the noise floor.
>
> And using FFT block in companion how do I extract the frequency samples
> and Power level for every sample.
>
> I am very new to gnuradio and very basic software skills.
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Gmane