Peak center frequency error

Regards,

Hi all,

When uhd_fft.py graphic always appears a peak at the center frequency,
because appears?, can be corrected?

Thanks you

Julio H.

On Sun, Apr 14, 2013 at 8:49 PM, Julio Hector Aguilar Renteria
[email protected] wrote:

Regards,

Hi all,

When uhd_fft.py graphic always appears a peak at the center frequency,
because appears?, can be corrected?

Thanks you

Julio H.

Julio,

That’s DC offset, and it should be very small relative to any real
signal. It’s been discussed many times on this list. You can filter it
out by calculating the average signal and subtracting it from the
input signal, or you can use something like the dc_blocker filter in
GNU Radio. It’s a choice now as to how much you want to remove the
signal and the effects of the shaping around DC that you are going to
introduce to get rid of it.

Tom