Geeks can be pranksters too. If you’re a little mischevious, an RF Jammer is a must have gag tool for the belt. Think of all the pranks you could pull off by blocking radio frequency signals using a jammer, even blocking cell phones from functioning. Â Interested? Then take read more about RF Jamming on this wiki page.
An RF jammer can be built as a DIY project as Adafruit’s Wave Bubble, a self-tuning portable RF jammer shows. The Wave Bubble calls itself a self-tuning, wide-bandwidth portable RF jammer.
Self tuning is via dual phase lock loops which nullify the need for a spectrum analyzer. Multiple programmable frequency bands make it work across a range of RFs. Tuned antennas give it a range of 20 feet. Output power is .1W (in high bands) and .3W (in low bands). Two hours of jamming work over dual frequency bands (as used by some cell phones) with a rechargeable internal lithium-ion battery should be enough for your dirty deeds. Or you can get more hours over a single band as used by cordless phones, GPS, Wi-Fi or Bluetooth. All this can be crammed in a palm sized cigarette pack. Thatâ€™s about 7″ x 4″ x 3.2″.
Note: Using a RF Jammers to block communication by disrupting the signal is an exclusive right of the authorities. Among other things they are extensively used to prevent remote activation of explosive devices by terrorists. Federal Communications Commission (FCC) rules apply and they take a dim view against illegal use of RF jamming devices.