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Today's sprint pcs bluetooth Article
Bluetooth Operation

The networking standards of Bluetooth will transmit
data via low power radio frequency. Bluetooth
communicates on a 2.45 GHz frequency. This very
band of frequency has been set aside by international
agreement for the use of industrial and medical
devices.

Many bluetooth phones devices that you already known and use take
advantage of this frequency band. Garage door
openers, baby monitors, and the next generation of
mobile phones all use this frequency within the ISM
band. Ensuring that Bluetooth and the other
devices don't interfere with each other is a crucial
part of the design process.

One of the ways Bluetooth will avoid interfering
with other electronic devices is by sending out
weak signals of around 1 mw. In comparison, even
the most powerful of cell phones can transmit a
signal of 3 watts.

The low power signals will limit the range of a
Bluetooth device to around 32 feet, which cut the
chances of interference between your computer and
other electronic devices. Even though it has low
power, Bluetooth doesn't require a line of sight
between bluetooth wireless the communicating devices. The walls in
your home won't stop bluetooth printer the signal, making it great
for rooms throughout the house.

Bluetooth can connect 8 devices at the same time.
With each of those devices on the same radius bluetooth printer,
you may think they would interfere with each
other, although it's very unlikely. Bluetooth
utilizes a technique known as low frequency
hopping, which makes it harder for more than
one device to transmit on the same frequency
at the same time.

With this technique, a device will use 79
individual, randomly chosen frequencies within
a designated range, which change from one another
on a regular basis.

In the case of Bluetooth bluetooth phones, the transmitters will
change frequency 1,600 times or more every
second, meaning that more devices can make full
use of the radio spectrum. Since every
transmitter of Bluetooth will use spread spectrum
automatically bluetooth phones bluetooth phones, it's very unlikely that two
transmitters will be on the same frequency at the
exact same time.

When the Bluetooth devices come within close range
of each other, an electronic conversation will
occur to determine whether or not they have
data to share or whether one needs to take total
control. The user doesn't have any buttons to
press or commands to give - as the conversation
will occur automatically.

Once the conversation has occured, the devices
will form a network. Bluetooth bluetooth devices will
create a bluetooth PAN (Personal Area Network) or piconet
that may fill a room. Once the piconet has been
established, the devices will randomly hop in
frequencies.

A synopsis on sprint pcs bluetooth .
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RF System Design of Transceivers for Wireless Communications

RF System Design of Transceivers for Wireless Communications

RF System Design of Transceivers for Wireless Communications is for RF Engineers and, in particular, those engineers focusing mostly on RF systems and RFIC design. The author develops systematic methods for RF systems design, complete with a comprehensive set of design formulas. Its focus on mobile station transmitter and receiver system design also applies to transceiver design of other wireless systems such as WLAN. The book is filled with detailed wireless systems design information, and addresses specifications that are critical for the design process.

Additional highlights include:

- Fundamental information on communications, signal and system theories

- Coverage of superheterodyne, direct-conversion, low-IF, and band-pass sampling radio architectures

- Frequency planning, system link budgeting, and performance evaluation of transmitters and receivers

- Nonlinearity effect analyses involving intermodulation, interferer blocking, spectrum regrowth and modulation

- Approaches for specifying RF ASICs on which mobile systems are built

- AGC systems, ADC dynamic range consideration and power management are addressed

- In-depth treatment of both theoretical and practical aspects of mobile station RF system design

This comprehensive reference work covers a wide range of topics from general principles of communication theory, as it applies to digital radio designs to specific examples on implementing multimode mobile systems. Wireless engineering professionals will definitely find this an invaluable reference book.

Customer Review: very bad english, good material though

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Scosche BTHPK Bluetooth Wireless Rechargeable Headphones with Built-in Retractable Microphone for all iPhone, iPod, MP3 / MP4 Players, Portable CD Players, Voice Recorders and Hands-Free Cellular Phones

Scosche BTHPK Bluetooth Wireless Rechargeable Headphones with Built-in Retractable Microphone for all iPhone, iPod, MP3 / MP4 Players, Portable CD Players, Voice Recorders and Hands-Free Cellular Phones
Want to enjoy a bit more freedom of movement while listening to your iPod or MP3 player? Check out the Scosche Bluetooth wireless headphones, which let you listen to your favorite music cable-free without sacrificing a hint of sound quality. The Bluetooth headphones come with a transmitter that plugs into your music player's 3.5 mm headphone jack, along with a USB charging cable. Once connected, the transmitter offers a wireless range of 30 feet, so you can wander across the living room or into the kitchen while listening to your favorite tunes without losing the signal. As a bonus, the headphones are equipped with a flip-down microphone for answering Bluetooth hands- free cell phone calls. Also outfitted with a rechargeable battery that lasts for six hours per charge, the headphones are backed by a 90-day warranty. Includes Headphones, transmitter, USB charging cable, user's manual.
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Jabra Bluetooth Stereo USB Adapter

Jabra Bluetooth Stereo USB Adapter
Enables Bluetooth devices to be connected wirelessly to PCClass 1 device with range up to 330' Wirelessly stream music to a Bluetooth headset Transfer pictures and files between Bluetooth devicesIncludes installation software

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