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Re: [Discuss-gnuradio] wx gui FFT sink missing peaks

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] wx gui FFT sink missing peaks
Date: Fri, 30 Aug 2013 12:24:12 -0400
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On 08/30/2013 12:01 PM, Nemanja Savic wrote:
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?


Nemanja Savić
_______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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