your samples rates do not match: usrp2 rate is 100e6/1e6
fft sink rate: 2e3 -Josh On 04/12/2010 12:29 AM, Umair Naeem wrote:
I have a query regarding flow graph in GRC. I am trying to get spectrum from DBS_RX daughter board using GRC. I have used three blocks as USRP2 Source --> FFT Filter --> FFT Sink They have following parameters, USRP2 Source: Decimation 1M Frequency 1G Gain (dB) 0 FFT Filter: Decimation 1 Taps firdes.complex_band_pass(1.0, 3000, -0.05e3, 0.05e3, 5, firdes.WIN_HAMMING, 0) FFT Sink: Sample Rate 2K Baseband Frequency 1K FFT Size 512 Refresh Rate 30 I need to display shows frequency spectrum centered at 1 GHz. Since I am using decimation of 1M, the frequency is lowered down to 1K. I filter it using FFT bandpass filter with 100 Hz bandwidth. The fft sink shows spectrum at around 1 KHz. The problem is if I do not use decimation, the GRC seems to be very slow (may be processing 1 GHz at GHz sample rate is too much). I need to make a FFT plot showing spectrum at 1 GHz. How Can I accomplish this? Regards, Umair Naeem MSc Communication Engineering Chalmers University ot Technology, Sweden. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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