"Available GSM scanner cost a shitload of money for no good reason."
Hmm... maybe it's because it's a rather complicated undertaking and the people who know how to do it generally want to get paid to do so?
Most people realize that when they pay $100k for a commercial GSM service monitor almost nothing of that is going into the hardware, but is instead paying all the guys who put it together.
That being said, companies like Agilent and Tektronix do have a *huge* overhead compared to smaller firms (or "virutal" firms!), and I'm sure you can build your GSM "scanner" for
I'm assuming he's targeting a global audience. In the U.S., they could designate their device as "test equipment" and make it perfectly legal to
*sell* if not necessarily *use* (the USRP board the web site suggests using is sold as such to avoid the problems of type acceptance, intended usage legality, etc.).
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