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Hi I am trying to demodulated a GFSK signal using gnu radio I connected an osmocom source to FIR filter and the filter to Quadrature demod (which output the signal to a file) as shown here: my flow graph

the Quadrature demod gain is - samp_rate/(2*pi*deviation/8).

Using Audacity I opened the file containing the demodulated signal. however no matter what packet I send (even if I don't send anything) I don't see the peeks which suppose to stand for a packet.

demodulated signal shown in audacity

you can see hear an example ,it seems that my device is sending packets constantly. what am i doing wrong?

Yedidya kfir
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1 Answers1

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I think you should change Sample Rate from 4M sps to a value greater than Ch0 Frequency (currently 868M Hz).

LRYindra
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