Wx gui FFT sink missing peaks

GNU Radio
1

Hi all,

i am for a long time experiencing (possible) problem with wx gui FFT
sink.
Namely, i have receiver implemented in usrp1 and transmitter which sends
signal regularly every minute. I receive corect packets and everything,
but
the problem is i can’t see the spectrum of the received signal. I
selected
option peak hold, and peak is catched very rarely.
Is this problem with parameters setup or some kind of malfunction of
this
block?

Thanks,

2

On 08/30/2013 12:01 PM, Nemanja S. wrote:

Thanks,

–
Nemanja Savić

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Discuss-gnuradio Info Page
If your transmission is very short, the FFT may not catch it. The FFT
display in Gnu Radio does a fair amount of decimation-by-windows, which
means
that it throws away a lot of the time-domain “chunks” that would
otherwise be processed, in order to attain the desired display-rate.