Re: [Discuss-gnuradio] peak near center freq for noise signal, how to fix it

[vegihat vegihat]

if i have understand i need to use the --lo-offset of uhd_rx_cfile

i have gave various values to  --lo-offset and only one value has moved the DC offset (--lo-offset=1G) and the plotfft gives many small spikes (maybe this is caused to aliasing, but i am not sure)

which is the rule (value of --lo-offset) to set the DC offset out of my band?

2013/4/26 vegihat vegihat <address@hidden>

i use the following command to capture some samples of noise

uhd_rx_cfile -a serial=4759a751 -N 100000 -f 2.48G --samp-rate=2M noise.dat

then using matlab i read the samples
 y=read_complex_binary ('noise.dat');

and i do plotfft
plotfft(y,2000000)

the plot shows a peak near the center. I don't know why. what could i do on the samples y so that the peak not appeared?

i attach the figure of plotfft

Screenshot-1.png
Description: PNG image