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[Discuss-gnuradio] GSM spectrum: Invisible 200kHz carriers?
From: |
TheOperator |
Subject: |
[Discuss-gnuradio] GSM spectrum: Invisible 200kHz carriers? |
Date: |
Thu, 2 Jun 2011 14:47:24 -0700 (PDT) |
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.
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