Hi,

I've been working towards an FSK demodulator scheme using GNU radio (more 
specifically, the signals are GFSK)
I've read through this example: 
https://nccgroup.github.io/RFTM/fsk_receiver.html

Specifically it talks about the "add_const" block, the value of which was 
determined by trial and error for the specific data set in use.

This "constant" is actually the frequency error value

Here, in this slide deck (slide 2)
        http://www.qsl.net/kb9mwr/projects/dv/apco25/GnuradioFourLevelFSK.pdf

They show a frequency correction feed back loop from the FSK4 demodulator to 
the front end, but uses a custom module.

I'm looking for a simpler way to do this using "stock components" that are 
already in Gnu Radio.

I can of course - make this work for one specific transmitter, and one specific 
receiver. This solution does not work well when I have 50 different 
transmitters, I need a solution that can adjust dynamically.

Any suggestions for stock components? Or another example?

Thanks.


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