Re: First tutorial

[Fabian Schwartau]

Hi Alexander,

I see exactly what is shown in the tutorial and I don't see any 
harmonics. There are a two "shoulders" left and right to the signal, 
which are caused by the window function, which is applied by the 
Frequency sink to reduce spectral leakage. When I increase the lower 
boundary of the Frequency sink I can also see a lot of "noise" around 
-180dB, which is caused by numerical instability. Everything as 
expected... or did I get your question wrong?

Best,
Fabian

Am 30.03.22 um 08:19 schrieb Alexander Plotnikov:
> Greetings everyone!
>
> Can anybody please explain to me why in this example 
> (https://wiki.gnuradio.org/index.php?title=Your_First_Flowgraph) the 
> spectrum graph shows a harmonic far below 0dB?
>
> Thanks everyone in advance!
> Alexander