Hello All,
Not sure whether this is the right place to ask such questions, but I am
interested whether there are any GNU Radio research programs in Poland.
---
Yarek
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Hi all,
is not clear for me if using a single USRP2 with 2 external RF
downconverters is possible to obtain the IQ samples from two channels. From
the FAQ seems that should be possible using the BasicRX with the 2 RF
front-ends connected to the two BasicRx RF input.
Can someone help me to clarify
>>> Hi,
>>>
>>> I am having trouble the the DBPSK mod and demod blocks. My flow graph is:
>>> file source -> DBPSKmod -> DBPSKdemod -> file sink
>>>
>>> If anyone knows why the output file of the whole graph would be 13 bytes
>>> or if I am missing something please let me know.
>>>
>>> Thanks,
>>>
How can I access parallel port(read and write) in GRC?
Regards,
Umair Naeem
MSc Communication Engineering
Chalmers University ot Technology, Sweden.
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On Thu, Apr 22, 2010 at 7:31 AM, Muhammad Ali Khan wrote:
> I don't know thats why i am asking, or may be amplitude modulation just
> guessing.
As long as you possess the knowledge of how to transmit and receive
the type of modulated signal you dream up, you can use software
defined radio to
I'm in a place where I have no USRP with which to test some changes.
The change is to move from a mix of threading via gr-omnithread and
darwin pthreads (via an intermediate class I called 'mld_threads') to
the gruel:: namespace threads. Here's the info:
$ git checkout wip/remove-mld-thre
On Thu, Apr 22, 2010 at 06:50, Michael Dickens wrote:
> I'm in a place where I have no USRP with which to test some changes. The
> change is to move from a mix of threading via gr-omnithread and darwin
> pthreads (via an intermediate class I called 'mld_threads') to the gruel::
> namespace threa
Hi Johnathan,
I'm modifying the gr-sounder project to transmit a 113-bit legendre sequence of
the bandwith 32kHz and upconvert to certain frequency in the range 1MHz to
20MHz. At receiver side, the received signal is downconverted to baseband and
store the received sequence into a data file.
Hi Johnathan,
I have updated to 3.3git-473-g41526cd4. It seems the lastest version from
the last week.
However, 'S' is still shown on the console everytime after I use stop wait
and start the flow graph again.
And received samples is not reset which caused a obvious delay for further
applicati
Hi, Martin
Can you put your version number if you have solved it?
thank you.
Andy
Martin Dvh wrote:
>
> Hi All,
>
> When you use an USRP2 for capturing and you call
>
> u2->stop_rx_streaming()
>
> and later
>
> u2->start_rx_streaming(0)
>
> You always get a single overrun.
> -a single '
On Thu, Apr 22, 2010 at 09:21, Yan Nie wrote:
> I'm modifying the gr-sounder project to transmit a 113-bit legendre sequence
> of the bandwith 32kHz and upconvert to certain frequency in the range 1MHz
> to 20MHz. At receiver side, the received signal is downconverted to baseband
> and store the
On Thu, Apr 22, 2010 at 09:21, Andy_Long wrote:
> I have updated to 3.3git-473-g41526cd4. It seems the lastest version from
> the last week.
The latest git master is 3.3git-725-g8d3a78da; however, it is only
available via using git to clone the repository.
It looks like you downloaded an older
Hi all,
For those of you unfamiliar with CGRAN, it is a host for 3rd party GNU Radio
applications: https://www.cgran.org
Just to settle some quick confusion, you do NOT need an account on CGRAN to
checkout a project. You only need an account if you wish to make wiki or
code changes. So, you are
On 04/22/2010 03:55 AM, Luca Pascale wrote:
Hi all,
is not clear for me if using a single USRP2 with 2 external RF
downconverters is possible to obtain the IQ samples from two channels.
From the FAQ seems that should be possible using the BasicRX with the 2
RF front-ends connected to the two Ba
On 04/11/2010 09:22 PM, Ian Holland wrote:
Hi All
I am trying a modified example of the digital-bert routines, for
communication between 2 USRP2s, and notice that I am getting a very
large number of overflows () even with decimation rate at the
receiver of 20, and 4 samples per symbol (s
On 04/22/2010 10:09 AM, George Nychis wrote:
Hi all,
For those of you unfamiliar with CGRAN, it is a host for 3rd party GNU
Radio applications: https://www.cgran.org
Just to settle some quick confusion, you do NOT need an account on CGRAN
to checkout a project. You only need an account if you
> > I'm modifying the gr-sounder project to transmit a 113-bit
> legendre sequence
> > of the bandwith 32kHz and upconvert to certain frequency in
> the range 1MHz
> > to 20MHz. At receiver side, the received signal is
> downconverted to baseband
> > and store the received sequence into a data f
From: Jason Uher
To: discuss-gnuradio@gnu.org; david.barto...@yahoo.com
Sent: Thu, April 22, 2010 7:51:41 AM
Subject: Re: [Discuss-gnuradio] DPSK Modulator and Demodulator
Thanks Jason. I have not delved into the code of the dbpsk demodulator
GRC block yet
Hi, Johnathan
I installed from binary package installation for Ubuntu 9.04. Last time you
said that "You'll need to switch from the binary install you have now to a
source code install from the git tree to get the fix. "
But the install guide from gnuradio wiki only shows that how to transfer
On Thu, Apr 22, 2010 at 12:51, Andy_Long wrote:
> 1, Can I keep all the package for gnuradio from binary package and update to
> the newest version by using git?
No. You will need to uninstall the binary packages.
> 2, When I can track the 3.3git-725-g8d3a78da version from "Ubuntu Jaunty
> (9.
Hi Johnathan,
Thank you so much for the response on the suggestion of BPSK modulation
implementation. I still have some questions on FPGA configuration and USRP
baord:
1. What signal on the input of the receiver side (rx_a_a and rx_b_a) in
gr-sounder application? (should the 12-bit signal be
On Thu, Apr 22, 2010 at 4:38 PM, Yan Nie wrote:
> 2. How does the tune() function work? Does that tune the signal after ADC,
> by creating a analog daughterboard? or it tunes the signal on the LFRX
> daughterboard before ADC?
I looked at the source and found the following.
/*!
* \brief Hig
On Fri, Apr 09, 2010 at 10:23:43PM -0400, Marcus D. Leech wrote:
> I'm trying to use a UDP source block from a GRC-produced flowgraph.
>
> The only thing it does is this:
>
> gr_block_executor: source produced no output.
> We're marking it DONE.
The udp source/sink needs an overhaul.
This err
On 04/22/2010 06:24 PM, Eric Blossom wrote:
> On Fri, Apr 09, 2010 at 10:23:43PM -0400, Marcus D. Leech wrote:
>
>> I'm trying to use a UDP source block from a GRC-produced flowgraph.
>>
>> The only thing it does is this:
>>
>> gr_block_executor: source produced no output.
>> We're marking it
Hi Matt
Myself and a colleague have created a C++ equivalent for the same
flowgraph, with realtime scheduling enabled. We still have overruns for
data rates above 2 Mbps, even on a Core i7 machine. We will try and make
a multi-threaded version to hopefully resolve this, since our version is
only s
In regards to using GRC to create the flowgraph, how can I check if
realtime scheduling is enabled, and/or enable realtime scheduling?
Select realtime scheduling in the options block. If your flow graph
fails to enable it at runtime, an error message is printed. -Josh
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On 04/22/2010 04:38 PM, Ian Holland wrote:
Hi Matt
Myself and a colleague have created a C++ equivalent for the same
flowgraph, with realtime scheduling enabled. We still have overruns for
data rates above 2 Mbps, even on a Core i7 machine. We will try and make
a multi-threaded version to hopefu
On 04/22/2010 07:56 PM, Matt Ettus wrote:
>
> I am pretty sure that what you are seeing is that your application is
> not keeping up. The USRP2 keeps sending data to the computer as fast
> as it generates it. The ethernet card DMAs it into some buffer in
> memory. Your app uses it and the driver
On Thu, Apr 22, 2010 at 21:18, Marcus D. Leech wrote:
> My application does a 1Hz-resolution FFT over the data (that's a 10.6M
> point FFT!)
Who would have thought ten years ago we'd be doing 10 million point
FFTs in real-time on computers you can buy at the local store :-)
Johnathan
Hi all, i am going to support this feature above gnuradio, but i know little
about gnuradio before. What is the correct way to support this feature?
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Thanks Marcus
Actually, the only filtering I did in the C++ version is for the M&M
clock recovery, i.e. in interpolating to get the symbols based on
imperfectly timed samples. In the GRC example, I also had an RRC filter,
with 11*samples_per_symbol taps, but this didn't appear to be the
bottleneck
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