Clear my fundamentals :)

[Blue Boy]

Hello Everyone,
           My first post:
    I am a windows kernel programmer by profession.Recently my interest
has grown for SDR gnuradio.I an new to this field so I have newbie
doubts.I would welcome if you just point to some links for my answers.
 1] What is usrp cfile format? complex/float but whats stored in numbers
 like amplitude/intensity/phase difference etc.
 2] Is frequency also stored in the cfile ? or we have to assume
frequency from file name? How to reconstruct complete/sampled signal
from Cfile ?
 3] Any scripts to read from cfile(Until USRP2 stocks are back :) ).I
have tried several old scripts but they  don't run  in latest gnuradio ?
Though i have made my own in GRC using
file-source->throttle->graphical-fft-sink.But i doubt on it as i am newbie.
 4] Can we write non graphical code also in GRC itself.
 5] Can't we use c/c++  instead of python.Its problematic to match even
indentations/tab/spaces.totally newbie to python.

Thanks Everyone...


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[Josh Blum-2]

Blue Boy wrote:
> Hello Everyone,
>            My first post:
>     I am a windows kernel programmer by profession.Recently my interest
> has grown for SDR gnuradio.I an new to this field so I have newbie
> doubts.I would welcome if you just point to some links for my answers.
>  1] What is usrp cfile format? complex/float but whats stored in numbers
>  like amplitude/intensity/phase difference etc.

Its a binary file containing 64-bit complex numbers where each 64 bit
complex number is 2 32-bit floating point numbers corresponding to to
the real and imaginary parts of a complex number.

>  2] Is frequency also stored in the cfile ? or we have to assume
> frequency from file name? How to reconstruct complete/sampled signal
> from Cfile ?

You need to know the sampling rate and baseband frequency, the file is
just raw data samples without any context.

>  3] Any scripts to read from cfile(Until USRP2 stocks are back :) ).I
> have tried several old scripts but they  don't run  in latest gnuradio ?
> Though i have made my own in GRC using
> file-source->throttle->graphical-fft-sink.But i doubt on it as i am newbie.

That grc flowgraph would work fine. To be accurate, you have to set the
samp_rate in the flowgraph and the baseband freq on the fft.

>  4] Can we write non graphical code also in GRC itself.

See the options block->generate mode.

>  5] Can't we use c/c++  instead of python.Its problematic to match even
> indentations/tab/spaces.totally newbie to python.
>

Of course, here is a c++ example code
http://gnuradio.org/cgit/gnuradio.git/tree/gnuradio-examples/c++

Although, python development is going to be a lot easier. I set my
editor to show whitespaces, never have a problem.

_josh

> Thanks Everyone...
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@...
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio


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[Martin Braun-4]

On Sun, Nov 01, 2009 at 10:59:33PM +0530, Blue Boy wrote:
>  5] Can't we use c/c++  instead of python.Its problematic to match even
> indentations/tab/spaces.totally newbie to python.

Josh answered all the questions well enough, but I'd like to emphasize
that the time saved by using Python probably outweighs the time having
to learn it - I'm serious, I never touched Python before I started
fiddling around with GR and now I use it for all kinds of stuff.

Cheers,
MB

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

Dipl.-Ing. Martin Braun
Research Associate

Kaiserstraße 12
Building 05.01
76131 Karlsruhe

Phone: [phone]
Fax: [phone]
www.cel.kit.edu

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



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