# GMSK demodulation

**URL:** <https://www.ruby-forum.com/t/gmsk-demodulation/264925>\
**Category:** GNU Radio\
**Created:** [July 21, 2024, 6:39pm UTC](https://www.ruby-forum.com/t/gmsk-demodulation/264925 "2024-07-21T18:39:09Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![panagiotispir](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/59ef9b/32.png) [@panagiotispir](https://www.ruby-forum.com/u/panagiotispir)\
**Post date:** [July 21, 2024, 6:39pm UTC](https://www.ruby-forum.com/t/gmsk-demodulation/264925/1 "2024-07-21T18:39:09Z")

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I am new in gnuradio programming.  
I am struggled all these days with GMSK demodulation and finally I am not sure if the flow and the parametarization of my gnu radio schema is correct and the demodulation of GMSK Recording is correct.  
I attach a photo of gnuradio schema.

 ![image](https://www.ruby-forum.com/uploads/default/original/2X/e/e9160006eae16a43e8244c0e804649013d48fc78.png)

My initial recording is at 10M and I decimate 8 times. The baud of the transmitter is 38400.  
The constellation seems like one of GMSK, but I save the output with the demodulated bits, but I cannot locate the sync word that I am waiting for.  
Can anyone give me any hint.  
Thanks in advance.