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RE: [Discuss-gnuradio] unknown peak in the FFT-Plot Sink
From: |
Paul Mathews |
Subject: |
RE: [Discuss-gnuradio] unknown peak in the FFT-Plot Sink |
Date: |
Fri, 20 Mar 2009 09:27:24 -0700 |
Use an Intermediate Frequency (IF) and frequency translating filter.
Paul Mathews
-----Original Message-----
From: Markus Feldmann [mailto:address@hidden
Sent: Friday, March 20, 2009 5:06 AM
To: gnu radio mailing list
Subject: [Discuss-gnuradio] unknown peak in the FFT-Plot Sink
Hi All,
in all the examples and in my own gnuradio Programm, there
is an unknown Peak in the FFT-Plot sink.
Here is the Screenshot:
http://img257.imageshack.us/img257/8017/nochstrender.jpg
How to avoid this ?
Wherefrom does this come ?
I attach my Program to this mail, but i think it is still ok.
I need this to measure the power of the noise.
Further on you see the noise has a wave form always in
the middle of the FFT-Plot, still when i watch another spectrum. In the
gnuraio example from Eric Blossom this doesn't appear, but this example only
use a sin-signal-source not a usrp-source.
How to avoid this ?
I tried to change the decimation and the sample Rate,
but doesn't solved this.
Regards Markus