[Discuss-gnuradio] How to Remove DRM Protection

[Sho Qiu]

DRM Protection WMA M4P AAC OGG WAV files to unprotected MP3, CD, iPod
and other MP3 player file formats.40x speed! 7.3
come here :http://www.remove-drm-protection.comRemove
-- 
Posted via http://www.ruby-forum.com/.


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Re: [Discuss-gnuradio] Question regarding Basic Tx/Rx Boards

[Matt Ettus]

[EMAIL PROTECTED] wrote:

Hi.

I have two questions:

1.) Is there any difference between the Basic Tx/Rx daughter boards that
were shipped with rev3 usrp board and rev4 usrp board?
  


No, the circuitry is the same.  Some very early boards had a slightly 
different silkscreen, but that is all.



2.) What is the functionality of .ihx (firmware file)? How is it different
from the fpga (.rbf) file?
  


The ihx file is compiled firmware for the 8051 in the FX2 USB chip.

matt


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[Discuss-gnuradio] Question regarding Basic Tx/Rx Boards

[mkhan]

Hi.

I have two questions:

1.) Is there any difference between the Basic Tx/Rx daughter boards that
were shipped with rev3 usrp board and rev4 usrp board?

2.) What is the functionality of .ihx (firmware file)? How is it different
from the fpga (.rbf) file?

Thanks.
Owais






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[Discuss-gnuradio] Payload generation in ofdm benchmark scripts

[Archana Ragothaman]

Hello,

I am trying to figure out how the payload is generated in ofdm benchmark
scripts. I figured how the preambles are generated and used using the
known_symbols arrays in ofdm.py. I am also being able to print the payload
that is transmitted on the screen. The payload starts with 10,11,12 and so
on till FF(for bpsk modulation). But which file actually generates this
sequence? I was looking at the gr_ofdm_mapper_bcv.cc but couldn't figure out
the logic. Can anyone please help me out?

Regards,
-- 
Archana Ragothaman
Master's in Telecommunications
Graduate Research Assistant
MIND Lab,UMIACS
University of Maryland, College Park
Email: [EMAIL PROTECTED]
Phone: 240-422-7887
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[Discuss-gnuradio] Channel Equalization in packet based demodulators.

[Tarun Tiwari]

Hello Friends,

What type of equalization is adopted in packet based demodulators and
where can I find the code of implementation?
Does demodulation happen over symbol by symbol?
Where can we find the IQ samples after equalization, are they stored
in any buffer?

I hope my queries are clear, if not please let me know and I will try
to make it clearer :)

Thank you.

Regards,
Tarun Tiwari
UT Dallas


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Re: [Discuss-gnuradio] where are usrp_fft.py and usrp_oscope.py now

[George Nychis]

Dawei Shen wrote:

Hi, Guys

When I checked out the latest version of GNU Radio from svn, I can't 
find the fft and oscope scrips in the example directory. Have they been 
removed? Thanks.




gr-utils/src/python/usrp_oscope.py
gr-utils/src/python/usrp_fft.py

- George


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[Discuss-gnuradio] where are usrp_fft.py and usrp_oscope.py now

[Dawei Shen]

Hi, Guys

When I checked out the latest version of GNU Radio from svn, I can't find
the fft and oscope scrips in the example directory. Have they been removed?
Thanks.

Dawei
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Re: [Discuss-gnuradio] Doubt about benchmark_rx and benchmark_tx

[NCSU]

We  are using the latest stable gnuradio (3.1) code by check out using the
following command:
( as given in the Build Guide)
svn co http://gnuradio.org/svn/gnuradio/branches/releases/3.1 gnuradio

We are running it on Fedora Core 7 (fc7) with kernel  version 2.6.21-1
(2.6.21-1.3194.fc7 ).
We varied the  rx-gain to different values and 90 being the highest, but
that did not help much !
We can generate signal and receive it using usrp_fft.py script, but
benchmark_rx.py is not receiving it.
We also tried changing the distance between two USRP boards between 1 and 3
m, even that did not fetch anything.

Please provide your inputs if you can figure out what could be going wrong.

Thanks,
Ashwin.


Eric Blossom wrote:
> 
> On Wed, Nov 14, 2007 at 09:50:42AM -0800, NCSU wrote:
> 
> Which version of GNU Radio are you using?
> One of the tarballs (3.1.1), or the trunk, or something older?
> What OS and distribution are you using?
> 
>   --rx-gain=90 seems awfully high.
> 
>> We are trying to install USRP and set it up to transmit and receive
>> packets.
>> We are novices at this. We are trying to use benchmark_tx.py and
>> benchmark_rx.py. We have Flex2400 daughter boards mounted on the
>> motherboard. We have two such boards connected to two different
>> computers.
>> We are following the procedure given in the README file but we are not
>> able
>> to receive anything using the benchmark_rx.py file. 
>> 
>> Our command line arguments are: 
>> TX:  ./benchmark_tx.py -f 2.4G  -v --discontinuous
>> 
>> RX: /benchmark_rx.py -f 2.4G --rx-gain=90  -v
> 
> Eric
> 
> 
> ___
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> 

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Re: [Discuss-gnuradio] Doubt about benchmark_rx and benchmark_tx

[Eric Blossom]

On Wed, Nov 14, 2007 at 09:50:42AM -0800, NCSU wrote:

Which version of GNU Radio are you using?
One of the tarballs (3.1.1), or the trunk, or something older?
What OS and distribution are you using?

  --rx-gain=90 seems awfully high.

> We are trying to install USRP and set it up to transmit and receive packets.
> We are novices at this. We are trying to use benchmark_tx.py and
> benchmark_rx.py. We have Flex2400 daughter boards mounted on the
> motherboard. We have two such boards connected to two different computers.
> We are following the procedure given in the README file but we are not able
> to receive anything using the benchmark_rx.py file. 
> 
> Our command line arguments are: 
> TX:  ./benchmark_tx.py -f 2.4G  -v --discontinuous
> 
> RX: /benchmark_rx.py -f 2.4G --rx-gain=90  -v

Eric


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Re: [Discuss-gnuradio] 2.2 GHz tx?

[Matt Ettus]

Ed Criscuolo wrote:

I'm in the process of trying to put together a package to
do some of the direct sequence spread spectrum modulations
used by NASA's TDRSS relay satellites.  I need to be able to
transmit on 2287.5 MHz, and this appears to be just above the
the range of the RFX-1800 (2.1 GHz) and just below the range
of the RFX-2400 (2.4 GHz).  Is it possible to transmit on
this frequency using either of these daughterboards?


You can modify an RFX1800 or an RFX2400 by replacing the 2 VCO/PLL 
chips.  You would need to remove the chips on there (ADF4360-3 in the 
case of the RFX1800, ADF4360-0 in the case of the RFX2400) and replace 
them with the ADF4360-1 from Analog devices.


Matt


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[Discuss-gnuradio] 2.2 GHz tx?

[Ed Criscuolo]

I'm in the process of trying to put together a package to
do some of the direct sequence spread spectrum modulations
used by NASA's TDRSS relay satellites.  I need to be able to
transmit on 2287.5 MHz, and this appears to be just above the
the range of the RFX-1800 (2.1 GHz) and just below the range
of the RFX-2400 (2.4 GHz).  Is it possible to transmit on
this frequency using either of these daughterboards?

@(^.^)@  Ed


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Re: [Discuss-gnuradio] sgo-filesink-seq

[Eric Blossom]

On Wed, Nov 14, 2007 at 12:45:09PM +, Juha Vierinen wrote:
> Hi,
> 
> I have now finally put together a release of a buffered filesink that
> I wrote a while back. The aim was to create a reliable way to
> continuously sample long periods of IQ signals in a data-portable
> manner. For this reason, the byte order is always saved as big endian.
> Also, the recording is chopped into a sequence of reasonably sized
> files (size configurable).
> 
> It is available at:
> 
> http://mep.fi/juha/gnuradio.html
> 
> The package also comes with a sampler script (sampler.py) that can be
> used to sample the IQ stream using USRP:

Cool!  Thanks!

Eric


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[Discuss-gnuradio] Doubt about benchmark_rx and benchmark_tx

[NCSU]

We are trying to install USRP and set it up to transmit and receive packets.
We are novices at this. We are trying to use benchmark_tx.py and
benchmark_rx.py. We have Flex2400 daughter boards mounted on the
motherboard. We have two such boards connected to two different computers.
We are following the procedure given in the README file but we are not able
to receive anything using the benchmark_rx.py file. 

Our command line arguments are: 
TX:  ./benchmark_tx.py -f 2.4G  -v --discontinuous

RX: /benchmark_rx.py -f 2.4G --rx-gain=90  -v

We confirmed that the Tx was transmitting some packets. We also tried
sending our own packets and this was also transmitted by the TX. However
there was no reaction from the RX side other than the verbose arguments
being printed. The callback function is not called at all which suggests
that the no packets are received. We checked the transmitted spectrum using
usrp_fft.py and we were able to detect the transmitted signal spectrum in 
the graph. This was visible only when a valid transmission was going on,
thus confirming that the TX seems to be working fine. 

What are we doing wrong? Should we do something in RX to receive this
signal/packet. Also we are using antennas and not a cable. 

-- 
View this message in context: 
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Re: [Discuss-gnuradio] GNURadio based ETSI DVB-T Transmitter works. Thanks to everybody for precious help!

[Martin]

Vincenzo Pellegrini wrote:


Hi everybody,
I would like to say thanks to Eric, Firas, Matt, Achilleas and to the 
other guys from the list from which I received an incredibly precious help.
My draft ETSI DVB-T transmitter works fine.. (It's gonna be the subject 
of my final thesis here @ Pisa University) the code is not yet clean, 
and I'm still far from real-time, but the signal is pretty good.. and 
carries its 11.612 Mbps flawlessly.


The work I still have to do is improving the code, and making it more 
efficient, then, if this project might be of some relevance to the 
community, I'll start a proper procedure for contributing it to gnuradio.

Yes please start this procedure.
Even if you do not have time to clean-up or improve the code it could be 
very usefull for the community if you made it available somewhere on the 
internet.




there are two videos showing how things go so far @
http://wwvince.interfree.it/11.3Mbps
http://wwvince.interfree.it/video2 
they're h264, VLC is fine with them

I still got one problem, the mpeg ts I'm using as the input to my system 
is a dump from a commercial transmission on the air here in italy, and 
it is meant for a 24Mbps channel, so RX buffer tipically has underruns 
as my channel only carries 11.612.
Does anybody know of any open source  DVB multiplexer (capable of 
writing also the NIT) that I could use to set up a mux at the right bitrate?


http://linuxtv.org/projects.php
MPEG2 multiplexer

An ISO-13818 compliant multiplexer for generating MPEG2 transport and 
program streams, developed and maintained by Oskar Schirmer. The TS 
multiplexer is able to run continously, with dynamically adjustable 
input streams for live broadcast.

Visit the MPEG2 multiplexer project page at:
http://www.scara.com/~schirmer/o/mplex13818/


Greetings,

Martin Dudok van Heel



best regards
--
Vincenzo Pellegrini




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[Discuss-gnuradio] GNURadio based ETSI DVB-T Transmitter works. Thanks to everybody for precious help!

[Vincenzo Pellegrini]

Hi everybody,
I would like to say thanks to Eric, Firas, Matt, Achilleas and to the other
guys from the list from which I received an incredibly precious help.
My draft ETSI DVB-T transmitter works fine.. (It's gonna be the subject of
my final thesis here @ Pisa University) the code is not yet clean, and I'm
still far from real-time, but the signal is pretty good.. and carries its
11.612 Mbps flawlessly.

The work I still have to do is improving the code, and making it more
efficient, then, if this project might be of some relevance to the
community, I'll start a proper procedure for contributing it to gnuradio.

there are two videos showing how things go so far @
http://wwvince.interfree.it/11.3Mbps
http://wwvince.interfree.it/video2
they're h264, VLC is fine with them

I still got one problem, the mpeg ts I'm using as the input to my system is
a dump from a commercial transmission on the air here in italy, and it is
meant for a 24Mbps channel, so RX buffer tipically has underruns as my
channel only carries 11.612.
Does anybody know of any open source  DVB multiplexer (capable of writing
also the NIT) that I could use to set up a mux at the right bitrate?

best regards
-- 
Vincenzo Pellegrini
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[Discuss-gnuradio] sgo-filesink-seq

[Juha Vierinen]

Hi,

I have now finally put together a release of a buffered filesink that
I wrote a while back. The aim was to create a reliable way to
continuously sample long periods of IQ signals in a data-portable
manner. For this reason, the byte order is always saved as big endian.
Also, the recording is chopped into a sequence of reasonably sized
files (size configurable).

It is available at:

http://mep.fi/juha/gnuradio.html

The package also comes with a sampler script (sampler.py) that can be
used to sample the IQ stream using USRP:

For example, to sample at center frequency 10.7MHz with decimation 32,
you would just say:

./sampler.py -c 10.7e6 -d 32

The data will then be continuously sampled and chopped into one second
sized files (default file size) is a 16-bit interleaved big-endian
format. A log file will record the center frequency, the used RX board
and sample rate. A timestamp file will be written, which contains the
approximate time when the files were written and the buffer fill
percentage.

In the examples directory there are also some sample GNU R and python
scripts that I have written to do some "real-time" monitoring of the
signals while recording.

juha


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