Dil's Domain

This is the block diagram I used to broadcast the content of a file over FM radio frequencies. GNU Radio is the SDR tool I use. Here the file is in Wav file format so I converted an mp3 song to a wav file using an online converter tool.  The blocks used are explained in my previous post of listening to FM radio. We first listened to the radio channel in the given frequency, and then as I run the flow graph the program got jammed. When the real radio was brought near the hackRF antenna, the channel we tuned to started playing the song in the Wav file.   Reference 

The flow graph I used to demodulate the GFSK modulated recorded MAVLink signals is as follows: The parameters used for FIR filter, low pass filter :  reference The value for "fsk_deviation_hz" variable was taken from the documentation of the radio module. Here is a screen shot of baudline view of signals with the raw parameter settings I used. No of channels are two, since hackRF logs I and Q data. However here, I have disabled one channel out of the two in the waveform to get the pattern. HackRF data input to baudline:  reference