G’day,
I’m looking for raw data. Don’t you use the usrp_rx_cfile.py script to
capture frequency spectrum?
e.g.: ./usrp_rx_cfile.py -d 32 -f 137.5M
You may need to play with the options -R, -g, -N (subdev, gain and
number of
samples) depending on your setup where
-R [A|B] site where the tvrx is plugged in
-g <0…115> gain (default is mid-point @ 58)
-N number of samples (e.g samplerate * record time in
sec)
I usually have to specify the frequency and the decimation.
I want to write my own decoder and an image sink to ultimately display
the
pictures received and hence audio files want do the trick.
cheerio Berndt
G’day,
I managed to capture the spectrum emitted by NOAA-12 for its entire
pass; not
quite sure anymore which one it was. Using a Diamond D130 discone
antenna and
a low noise broadband power amplifier (10-2000MHz, g=20dB, nf=3.5,
po=+20dbm!!!) the signal was recorded utilizing the usrp_rx_cfile.py
python
script, a gain of 100, and decimation of 250 centered on 137.5MHz. It
produced a very large file
-rw-r–r-- 1 root wheel 1117519872 Dec 9 20:01 noaa-12.dat
This a little more than 1GB!!! and 419MB zipped. Do we have a place
were it
can be uploaded for other list members that are interested? My bandwidth
isn’t large enough to offer it to public from here.
I was surprised how loud the signal was, considering the equipment used
here,
and how well the TVRX card performed. Now I’m really looking forward to
shooting the big birds = geostationary satellites.
BTW: Do we have an AFC block to compensate for doublershift or is this
something we still need to implement? I looked through the documentation
but
failed to find anything there.
cheerio Berndt
On Sunday 10 December 2006 12:11, Berndt Josef W. wrote:
-rw-r–r-- 1 root wheel 1117519872 Dec 9 20:01 noaa-12.dat
This a little more than 1GB!!! and 419MB zipped. Do we have a place were
it can be uploaded for other list members that are interested? My bandwidth
isn’t large enough to offer it to public from here.
Considered running flac or mac on it?
I got really quite good results with mac on our radar data files since
it
could handle 300 separate channels (5 ip/qp pairs, 30 range gates)…
flac
worked well until I hit it’s 8 channel limit.
On Sun, Dec 10, 2006 at 05:15:09PM +1030, Daniel O’Connor wrote:
worked well until I hit it’s 8 channel limit.
FYI, I’m downloading it to gnuradio.org right now.
I’ll post later on today when it’s ready to grab.
Eric
On Sun, Dec 10, 2006 at 12:11:55PM +1030, Berndt Josef W. wrote:
This a little more than 1GB!!! and 419MB zipped. Do we have a place were it
can be uploaded for other list members that are interested? My bandwidth
isn’t large enough to offer it to public from here.
I’ve uploaded the file to gnuradio.org.
See http://gnuradio.org/trac/wiki/SampleData for the link
Thanks Berndt!
Eric