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Re: Problem with GFSK Mod and Demod example from wiki

From: Solomon Tan
Subject: Re: Problem with GFSK Mod and Demod example from wiki
Date: Tue, 24 Aug 2021 07:10:35 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

(Edited and resent because I did not CC the correct mailing list email)

Hi Niko,

I am Solomon. I made the GFSK Demod example.  For some reason I could
not download the attachments, so I cant tell exactly what your issue is,
so I can only guess what it may have been. If the time sink only shows
signal on the input to the modulator, it means that the modulator is not
producing any sample, meaning the input is likely formatted in a way it
cannot accept.

To replicate the results in the example, you would need to check the
1. Make sure you have a vector of 9 bits in your vector source. e.g.
(0,0,0,1,1,1,0,1,1) was what I used.
2. Make sure you turn off the unpack function in the GFSK Mod block. You
will need to double click the block to bring up the Properties pop-up in
order to turn it off. Turn it off. Then you will see "Unpack: Off" show
up on the block after you close its Properties pop-up.

Hope that fixes your issue. Let me know whether it does. I'll update the
Wiki so itll be clearer on how to replicate the screenshot. Thanks for
bringing it up.


> Message: 3
> Date: Fri, 20 Aug 2021 23:01:40 +0200
> From: Nikoloz Glonti <ng91@glonti.com>
> To: discuss-gnuradio@gnu.org
> Subject: Problem with GFSK Mod and Demod example from wiki
> Message-ID: <76a7f56f-d645-a972-800c-ec21406134c7@glonti.com>
> Content-Type: text/plain; charset="utf-8"
> 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?
> Niko
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