Wave Bubble: the portable, undercover FM jammer

From Engadget:

There's no better way to celebrate the one hundredth birthday of broadcast radio -- or to completely enrage your sibling by rendering that brand new cellphone useless -- than to craft your very own FM jammer. Branching out from the many other jammers we've already seen, the Wave Bubble touts itself as being a "self-tuning, wide-bandwidth" rig that doesn't require a spectrum analyzer, and can "jam many different frequency bands" all in a pocket-friendly enclosure. Powered by an internal Li-ion cell, this bad boy provides self-tuning via "dual PLL," and you can manually enter new frequencies to vex by simply plugging it into your PC's USB port and inputting the data when prompted. It can purportedly provide up to two hours of jamming on dual bands (such as "cellphones") or four hours on single bands such as "cordless phones, GPS, WiFi, Bluetooth, etc." Additionally, the output power ranges from 0.1-watts (high bands) to 0.3-watts (low bands), and the handy device sports an approximate range of about 20 feet with "well-tuned antennas." Of course, you aren't apt to find this for sale anywhere considering the fit the FCC would undoubtedly throw, but if you consider yourself a master of the DIY craft, be sure to tag the read link for some in-depth pedagogy.

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