Don't use a throttle in a flow graph with a hardware source. A throttle block
is software-limiting the number of samples that pass your flowgraph on average
in a given time. You have an USRP that produces samples at a constant rate:
Either this rate is significantly lower than your throttle rat
Hi Robert!
This is strange -- but could be explained by the fact that numerical inaccuracy
don't allow us to *exactly* recreate all values during fft-ifft operation.
Also, make sure you use a rectangular window.
How do you know there is this very low frequency carrier? how low is it? How
much
Is there a block that can set a threshold in the freq domain? That is,
any freq with less than x db should have no power whatsoever?
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When I take a signal, stream->vector-->FFT-->IFFT-->vector->stream,
I'd expect to get the original signal back. Instead, I'm getting
something like the original signal, but following a very low frequency
carrier.
I thought this was due to the limits in vector size, but making this
very high (many
As always, thank you, Marcus.
I am thinking about getting rid of the graph (and throttle, now), and
making another setup to run the output file from the original (through a
throttle?) to the graph to look at smaller pieces. I want to be able to
look at (say) 5MHz-10MHz, so my plan is to set the FF
I am running a USRP source through a throttle to an FFT sink and a
file sink. Last time I ran it, I got an "OSParam error", followed by a
bunch of "D"s and the FFT was lagging and jumping. Any ideas as to
what this is? My sample rate is 50M.
Paul B. Huter
I am running a USRP source through a throttle to an FFT sink and a file
sink. Last time I ran it, I got an "OSParam error", followed by a bunch of
"D"s and the FFT was lagging and jumping. Any ideas as to what this is? My
sample rate is 50M.
Paul B. Huter
__
On Sun, Nov 17, 2013 at 5:03 PM, Steve Glass wrote:
> Hi,
>
> Some minor changes relating to metadata files and stream tags. The first
> simply provides a command line option that causes uhd_rx_cfile to write
> metadata files. The second modifies the throttle so that it uses the
> rx_rate stream t
On Sun, Nov 17, 2013 at 5:01 PM, Steve Glass wrote:
> Hi,
>
> The gnuradio/math.h header is causing some problems for some
> out-of-tree builds that use C code. If these projects add the GNURadio
> includes to their build path then the system math.h header is hidden
> and cannot be included (this
Hi,
Some minor changes relating to metadata files and stream tags. The first
simply provides a command line option that causes uhd_rx_cfile to write
metadata files. The second modifies the throttle so that it uses the
rx_rate stream tag to change the throttle rate (this behaviour is
enabled only
Hi,
The gnuradio/math.h header is causing some problems for some
out-of-tree builds that use C code. If these projects add the GNURadio
includes to their build path then the system math.h header is hidden
and cannot be included (this occurs, e.g., in AirProbe's gsm-receiver).
It seems bad form t
On Sun, Nov 17, 2013 at 12:27 PM, Robert James wrote:
> The font size in GNU Radio Companion seems to be fixed and quite
> small, at least for those with visual impairements. Is there any way
> to change it (either via GUI or via a source edit)?
Nothing right now. In the past, I've used the acce
On Sun, Nov 17, 2013 at 2:53 PM, Robert James wrote:
> I see. For those of us who have some background in analog circuits,
> is there a way to work with real valued passband signals? For example,
> is there a block which takes a complex baseband signal and converts it
> to a real valued passband
I see. For those of us who have some background in analog circuits,
is there a way to work with real valued passband signals? For example,
is there a block which takes a complex baseband signal and converts it
to a real valued passband signal?
On 11/17/13, Johnathan Corgan wrote:
> On 11/17/201
On 11/17/2013 11:01 AM, Robert James wrote:
> I'm trying to demodulate AM (I know there are existing blocks to do
> that, but I'd like to learn how to do it on my own).
>
> In a real world analog circuit, I would find the envelope by first
> rectifying the signal (using a diode), and then using a
I'm trying to demodulate AM (I know there are existing blocks to do
that, but I'd like to learn how to do it on my own).
In a real world analog circuit, I would find the envelope by first
rectifying the signal (using a diode), and then using a low pass
filter - that would give me the envelope.
Ho
The font size in GNU Radio Companion seems to be fixed and quite
small, at least for those with visual impairements. Is there any way
to change it (either via GUI or via a source edit)?
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On Sun, Nov 17, 2013 at 9:39 AM, Frederik Wing wrote:
> Hello again,
>
> meanwhile I got some more information about the error.
> It occurs when returning the taps from the firdes::low_pass function.
> But ONLY under some conditions.
> I wrote a simple script which is NOT working and giving the er
On Sun, Nov 17, 2013 at 8:32 AM, Robert James wrote:
> Hi. I'm new to GNU Radio but have experience with basic DSP (using
> MATLAB for instance). Which blocks can I use to do these simple
> tasks:
>
> 1. Convolution with an arbitrary (constant) wave in the time domain?
> Example: I provide the w
On Sun, Nov 17, 2013 at 8:51 AM, Paul B. Huter wrote:
> Thanks for the response.
>
> I am using a USRP2 N210 with the shortwave receiver daughterboard. When I
> was playing around, I was getting an error when I set the sample rate on the
> USRP source to 30MHz, and was told it had something to do
Hello again,
meanwhile I got some more information about the error.
It occurs when returning the taps from the firdes::low_pass function.
But ONLY under some conditions.
I wrote a simple script which is NOT working and giving the error
mentioned earlier:
> from gnuradio.filter import firdes
>
> f_
Hi Marcus,
that is the instructions of building gnuradio, isn't it?
I wanted to install new library into gnuradio or any new files.
Is that a different thing?
Best,
-
Nasimi
Воскресенье, 17 ноября 2013, 14:37 +01:00 от Marcus Müller :
>I'm referring you to the official build
guide, htt
Thanks for the response.
I am using a USRP2 N210 with the shortwave receiver daughterboard. When I
was playing around, I was getting an error when I set the sample rate on
the USRP source to 30MHz, and was told it had something to do with dividing
100 by 30 and not getting an integer (you get 3.33
I'm referring you to the official build guide,
http://gnuradio.org/redmine/projects/gnuradio/wiki/BuildGuide,
specifically: go to your source directory,
mkdir build
cd build
cmake ..
make
sudo make install
Where did you get your instructions? They are very outdated...
Greetings
Marcus
On 11/1
Hi Marcus,
Yes, my GNU radio version is 3.6.
I used ./bootstrap, that did not work :(
Can you tell me how to use cmake to install the shared library to gnuradio?
Best,
-
NE
Воскресенье, 17 ноября 2013, 14:25 +01:00 от Marcus Müller :
>Hi Nesimi,
>
>I don't know how old your GNU Radio version
Hi. I'm new to GNU Radio but have experience with basic DSP (using
MATLAB for instance). Which blocks can I use to do these simple
tasks:
1. Convolution with an arbitrary (constant) wave in the time domain?
Example: I provide the wave as a fixed series of constants, I'd like
to convolute with it
Hi Nesimi,
I don't know how old your GNU Radio version actually is, but I urge you that if
you -- by any means -- can convert your application to at least GNU Radio 3.6
or even better 3.7: do it!
3.6 and 2.7 both build using cmake which is much easier to use than the whole
auto*-hell and a who
Hi all,
I need your help: I want to install some files (old gnu library and developed
files) for GNU to my new Ubuntu: 13.04.
All config, makefiles were for old ubuntu.
I run these:
$ autoscan
then change config.scan to .ac
$ autoconf
$ aclocal
$ automake
when I run
$ make
it triggers thes
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