Hi 
I have a question, I hope you guys can help me… I am trying to learn some matlab language and play along with satellites… There are FOX sereis satellites, and I am especially interested in the one which sends DUV data. My question is is the signal received by me using for instance GQRX (wav file) is an analog signal or digital ? The thing I want to do in Matlab is to cut the audio data which is higher than 200Hz, keep only data and plot the (de?)modulated signal. So I want to save the wav file, and demodulate it but I am not really sure how to start :(… and what will i receive should I use a filter and than FSK demodulator or modulator ? because as I am not sure what type is the input signal I do not know if to modulate or demodulate … I am just a beginner, and I wish you can guys help me 