Myles Long from Cult of the Dead Cow writes,
Ninja Strike Force member Lady Ada has posted a design for a self-tuning, microprocessor controlled, wide band RF jammer.
Lady Ada (who is, omg, a girl! not knitting, but hacking hardware!) explains:
This website details the design and construction [of a] Wave Bubble: a self-tuning, wide-bandwidth portable RF jammer. The device is lightweight and small for easy camoflauging: it is the size of a pack of cigarettes.
An internal lithium-ion battery provides up to 2 hours of jamming (two bands, such as cell) or 4 hours (single band, such as cordless phone, GPS, WiFi, bluetooth, etc). The battery is rechargeable via a mini-USB connector or 4mm DC jack (a common size). Alternately, 3 AAA batteries may also be used.
Link. Before you go out and use one of these things, folks -- remember, RF jammers are illegal.
Here was an interesting item on Lady Ada's FAQ -- could this thing be used to remotely disable roadside bombs in Iraq?
Q: I'm a member/relation in xyz military service and I would like to use these devices to protect against RF-triggered IEDs
A: While cell phone jammers are useful against some IEDs, many current designs are trigged by signal-loss. I have no more pointers, but perhaps someone in your organization with more experience can inform you of the best defences one can take against such devices.
(Thanks, Oxblood Ruffin!) Read the rest