Today we are featuring an article from Phrack – an online hacker magazine. What we have is a do-it-yourself GPS jammer that can have a range of upto several hundred feet. Keep in mind this is not an easy hack – a bachelors in electrical engineering seems like a prerequisite.
The GPS band pass filter is a 2-pole Toko 4DFA-1575B-12 ceramic dielectric filter from Digi-Key, part number TKS2609CT-ND. This part is optional, but helps clean up the RF spectrum before further amplification. The filter’s insertion loss is around 2 dB.
The final RF amplifier is a WJ Communications AH102. It provides another 13 dB of gain, with a higher P1dB compression point of around +27 dBm (500 mW). The AH102 draws the most current of any part, and is not really necessary if you’re aiming for a low range, low current, battery operated device.
This hack is designed to be a low cost one, only using components you can easily find at a trip to Radio Shack. It targets the Global Positioning System (GPS/NAVSTAR) L1 frequency of 1575.42 MHz. Also keep in mind this device will not work against the Russian GLONASS or European Galileo systems.