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Re: Problem with GFSK Mod and Demod example from wiki

From: Robert McGwier
Subject: Re: Problem with GFSK Mod and Demod example from wiki
Date: Sun, 22 Aug 2021 08:54:40 -0500

It appears to me you have a rectangular or wideband filter and not Gaussian with a filter shape that smooths the pulses and restricts the bandwidth.  If you take the FFT of the signal you have on the left over many bauds, you will see an approximate sin(x)/x  appearing shape.


On Fri, Aug 20, 2021 at 4:05 PM Nikoloz Glonti <ng91@glonti.com> wrote:
Hello everybody,

I want to do some simple test of GFSK modulator and demodulator. I used
an example from wiki - https://wiki.gnuradio.org/index.php/GFSK_Demod .
I copied flowgraph, but my Time sink shows me only signal on input of
modulator - output signal is really weird - some peaks...
Why I can't get the same results as shown on wiki?


Dr. Robert W McGwier, Ph.D.
Adjunct Faculty, Virginia Tech
ARDC Member of Board
Sky: AAVSO, SkyHub, Auburn AS, Skyscrapers

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