Use an Intermediate Frequency (IF) and frequency translating filter. Paul Mathews
-----Original Message----- From: Markus Feldmann [mailto:[email protected]] 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 _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
