Problem with playback

GNU Radio
1

Hello GnuRadio Mailing list,

I cannot get playback working correctly. There is a program
“usrp2_rx_cfile.py” that can record to a file and “usrp2_siggen_gui.py”
that
can be used to transmit a signal. But there is no program that reads a
file
and transmits the data in the file. There is a C++ program
“tx_samples.cc”
that can transmit a file but it cannot seem to read a file recorded by
the
Python program. When I use tx_samples.cc to transmit a file recorded by
the
Python program, I get random noise on my spectrum display.

I am using a signal generator to record a signal and spectrum analyzer
to
verify I’m transmitting correctly. I used the spectrum analyzer to
determine
that “usrp2_siggen_gui.py” is working correctly and Matlab to verify my
recorded signals when using the program “usrp2_rx_cfile.py”.

Thanks for the help,

Hafeez

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2

On Mon, Jun 15, 2009 at 3:53 PM, hjaffer[email protected] wrote:

But there is no program that reads a file and transmits the data in the file.

I have created feature request #400 to cover this. No promises on
when it will happen, but it’s pretty easy to do.

Johnathan

3

On Mon, Jun 15, 2009 at 6:53 PM, hjaffer [email protected]
wrote:

But there is no program that reads a file and transmits the data in the
file.

I’ve made available online a python script that does that. You can
download
it at http://mmbtools.crc.ca/content/view/37/63/. It takes raw samples
as
input. The output can be a mix of the gnuradio oscilloscope (-o), the
gnuradio spectrum (-s) or the USRP (-u).

I hope it will answer your needs. If not, at least you will have some
code
to start playing with. Please note that GUI does not work except for the
close button…

Pascal

4

I have a USRP2 and I think your code is only for the USRP1. Do you have
a
version for the USRP2?

Hafeez

Pascal C. wrote:

as
Discuss-gnuradio mailing list
[email protected]
Discuss-gnuradio Info Page

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5

On Wed, Jun 17, 2009 at 1:47 PM, hjaffer [email protected]
wrote:

I have a USRP2 and I think your code is only for the USRP1. Do you have a
version for the USRP2?

Hafeez

Sorry, I’ve never tested it with the USRP2.

Pascal