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Posts Tagged ‘Cell Phone’

Ahh…this will be a pretty random and incoherent post.  All of that turkey in my system is making me sleeepy. : ]

So during the Black Friday rush, my dad got me a Jabra Bluetooth Headset.  After playing around with it, I started wondering about how this wireless connection is formed in the first place, allowing me to “control” my cell phone/computer/etc. from a distance.  It turns out that data is transmitted via low-power radio waves at a frequency of 2.45 gigahertz. Bluetooth devices send out pretty weak signals of only 1 milliwatt, avoiding interference with other systems like your TV or telephone (we wouldn’t want that happening!)  The low power also explains why the operating range is only up to 33 feet.

I Have a Blue Tooth From Eating Mint Chocolate! xD

Another item of interest to me was how a single Bluetooth headset could connect to several devices at once and still function normally.  One might expect all of those emitted waves in that little bubble with a 33 ft radius to interfere with each other.  However, Blue uses a spread-spectrum frequency hopping technique to minimize such a possibility.  Basically, the device “hops” between 79 randomly selected frequencies in a certain range 1,600 times a second!!  So it is very very unlikely for two devices to have the same frequency at the same time, preventing creation of a new wave pattern from two or more waves.

Hope everyone had a nice Thanksgiving!!  If you have some spare time, why not start getting into the holiday spirit and spice up those carols with a bit of physics knowledge? 😀

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