Hi,
This doesn't look like a GSM signal. There some pictures of GSM spectrum
captured with USRP on the internet. I don't have a link near my hands, but
you can probably google them easily.
Regards,
Alexander Chemeris.
On Jun 3, 2011 4:21 AM, TheOperator leo...@bluemail.ch wrote:
Ben Wojtowicz
Ben Wojtowicz wrote:
Are you saying that you are seeing 4MHz wide signals? Or are you seeing
~200KHz wide signals seperated by 4MHz?I see about 200kHz wide signals
spaced 4MHz.
Ben Wojtowicz wrote:
If you are seeing ~200KHz wide signals spaced by 4MHz, these most likely
are
GSM signals.
Hi,
I am using the USRP board with the DBSRX daughter board.
According to my knowledge, the swiss GSM 900 frequency band consists of
channels at an interval of 200kHz. However, when I build a simple system
with an USRP source and a FFT sink and analyze the spectrum around 900MHz, I
only see
Operator,
Are you saying that you are seeing 4MHz wide signals? Or are you seeing
~200KHz wide signals seperated by 4MHz?
If you are seeing 4MHz wide signals, they are not GSM. There is most likely
another technology being transmitted.
If you are seeing ~200KHz wide signals spaced by 4MHz,
You might also try playing with kalibrate
http://thre.at/kalibrate
it will scan for GSM base stations and use the results to determine
the current local frequency error in your USRP. If you have an
independent means of determining this error frequency, and compare
this with the results of
