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 peaks spaced 4MHz (about 30dB above noise level). I also tried to set the USRP gain to 100dB, the shape of the frequency plot didn't change. Is it possible to see these 200kHz channels without further filtering? Or do I miss an important detail in how these 4MHz peaks come about? Thanks in advance. -- View this message in context: http://old.nabble.com/GSM-spectrum%3A-Invisible-200kHz-carriers--tp31761278p31761278.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
