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| HOW DOES BLUETOOTH WORKS |
Bluetooth is a technology that allows devices such as cell phones, cordless phones, television sets, personal computers, stereos, DVD players, entertainment centers, and TV and satellite radio to talk to each other. These devices can communicate with each other without stringing messy wires and cords between them. It is all done with radio signals.
Bluetooth creates a small area network that operates on a frequency of about 2.45 gigahertz (GHz). The US government has set this frequency band aside for industrial, scientific, and medical use. It is the same band used for baby monitors and some garage door openers and cordless phones.
Bluetooth devices send out very weak radio signals—in some cases, as little as about one milliwatt. The coverage distance is typically about thirty feet. That extremely low power ensures that a Bluetooth device won’t interfere with other devices and is also very easy on batteries.
Bluetooth uses a technique called frequency hopping spread spectrum. It uses seventy-nine randomly chosen frequencies, changing from one to another on a regular basis. The transmitters change frequencies sixteen hundred times every second. So it is unlikely that two transmitters will be on the same frequency at the same time.
Bluetooth allows an operator to set up a personal area network (PAN) in their house and car. This “piconet” may tie together their cell phone, stereo, computer, DVD player, satellite TV and radio receivers, and cell phone. Ease of setup is one of the big attractions of Bluetooth. No need to wade through a ton of instruction manuals. When any Bluetooth-ready device is turned on, it automatically sends out radio signals to other devices. Then it “listens” for radio signals in response. Once it identifies a signal, it locks it in and remains active with other devices within that thirty-foot distance.
Bluetooth allows hands-free cell phone use. That’s a big advantage for car drivers, as many states have passed laws banning cell phone use and/or texting while driving. Users can be jogging or fishing or relaxing on the veranda while listening to music on their Bluetooth. The jawbone-shaped headset is now a common sight.
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