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Blind Signal Analysis

So here I am just browsing through the electro-magnetic spectrum with gqrx and I come across a signal…a strong signal at that.  Obviously this piqued my curiosity so I decided to check it out.  I started out by recording just the raw signal with GNURadio and saving it to a file.  Afterwards I ran it through a few filters and put it up on the scope sink, and FFT.  In the end (with the help of a constellation plot) I was able to figure out it was FSK modulated.  I quickly demodulated the signal and through the contents into another file to check out with a hex editor. Continue reading →

Posted by DCCoder in Posts from old site, RF, 0 comments