How to Hack Radio Frequencies: Hijacking FM Radio with a Raspberry Pi & Wire

In our first part on software-defined radio and signals intelligence, we learned how to set up a radio listening station to find and decode hidden radio signals — just like the hackers who triggered the emergency siren system in Dallas, Texas, probably did. Now that we know how to find and decode hidden transmissions, we can work on the part that mattered most in that scenario — rebroadcasting the signals. So how did the attackers broadcast the code they found to control the sirens? Did they need thousands of dollars of sophisticated equipment? Likely not. All you really need to rebroadcast... more

from Null Byte « WonderHowTo full article here