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…
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
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 B.
Research Associate
Kaiserstraße 12
Building 05.01
76131 Karlsruhe
Phone: +49 721 608-3790
Fax: +49 721 608-6071
www.cel.kit.edu
KIT – University of the State of Baden-Württemberg and
National Research Center of the Helmholtz Association
).I