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Re: Problem with GFSK Mod and Demod example from wiki
From: |
Jeff S |
Subject: |
Re: Problem with GFSK Mod and Demod example from wiki |
Date: |
Mon, 23 Aug 2021 11:21:52 +0000 |
Nicko,
It doesn't look to me like the Time Sink is looking at the same type of data.
Symbols (full 8-bit bytes) are going into the GFSK Mod. What is coming out of
the GFSK Demod appears to be 8-sample representations of the input byte. You
can see from the first tag on the Signal 1 that there are seven zeros followed
by a 1, which represents your first input byte of 0x01. If you look at the
rest of the samples in 8-bit chunks, you'll see your vector represented (0x01,
0x00, ...). I believe the flow graph will eventually stall since there is 8x
more data going into port 0 as there is port 1.
As for your original question about the wiki, it looks like it may be
referencing a later version than what I have (I am using v3.8) because there is
an "Unpack" configuration option in the GFSK Mod that I don't have, and it may
be the same for you (I didn't see you post version info of what you are using).
I am not sure at this point if that is what is causing the wiki example to
work, while your example does not.
Hope my inarticulate description helps some.
Jeff
________________________________________
From: Discuss-gnuradio <discuss-gnuradio-bounces+e070832=hotmail.com@gnu.org>
on behalf of Nikoloz Glonti <ng91@glonti.com>
Sent: Friday, August 20, 2021 4:01 PM
To: discuss-gnuradio@gnu.org
Subject: Problem with GFSK Mod and Demod example from wiki
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
Screenshot from 2021-08-23 05-56-48.png
Description: Screenshot from 2021-08-23 05-56-48.png