General Answers for bluetooth from 1powrshop (3)

Q: What is Frequency-Hopping Spread Spectrum (FHSS)?A: Frequency-Hopping Spread-Spectrum (FHSS) is a spread spectrum modulation scheme that uses a narrowband carrier that changes frequency in a pattern known to both transmitter and receiver. Properly synchronized, they maintain a single logical channel. To an unintended receiver, FHSS appears as short-duration impulse noise. More simply, the data is broken down into packets and transmitted to the receiver of other devices over numerous "hop frequencies" (79 total) in a pseudo random pattern. Only transmitters and receivers that are synchronized on the same hop frequency pattern will have access to the transmitted data. The transmitter switches hop frequencies 1,600 times per second to assure a high degree of data security.
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Q: Will other RF (Radio Frequency) devices interfere with Bluetooth Devices?A: No. Bluetooth radios operate on the unlicensed 2.4 GHz (Industrial, Scientific and Medical) frequency band that is shared among other devices (microwave ovens, cordless phones, garage door openers, etc. ). Bluetooth radios switch frequencies at such a rapid pace (1,600 times per second) and the data packets are so small that interference from other RF sources is highly unlikely. Bluetooth is a robust communication system.
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Q: Will Bluetooth and Wireless LAN (WLAN) interfere with each other?A: No, both Bluetooth and WLAN can co-exist. Since Bluetooth devices use Frequency Hopping and most WLANs use Direct Sequence Spreading techniques they each appear as background noise to the other and should not cause any perceivable performance issues.
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Q: What is the data throughput speed of a Bluetooth connection?A: Bluetooth transfers data at a rate of 721 Kbps, which is from three to eight times the average speed of parallel and serial ports, respectively. This bandwidth is capable of transmitting voice, data, video and still images.
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Q: What is the range of Bluetooth transmitter/receivers? A: Bluetooth is designed for very low power use, and the transmission range will only be 10m, about 30ft. High-powered Bluetooth devices will enable ranges up to 100m (300ft). Considering the design philosophy behind Bluetooth, even the 10m range is adequate for the purposes Bluetooth is intended for. Later versions of the Bluetooth spec may allow longer ranges.
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Q: What kind of encryption will be used for Bluetooth security?A: The Bluetooth specification 1.0 describes the link encryption algorithm as a stream cipher using 4 LFSR (linear feedback shift registers). The sum of the width of the LFSRs is 128, and the spec says "the effective key length is selectable between 8 and 128 bits". This arrangement allows Bluetooth to be used in countries with regulations limiting encryption strength, and "facilitate a future upgrade path for the security without the need for a costly redesign of the algorithms and encryption hardware" according to the Bluetooth specification. Key generation and authentication seems to be using the 8-round SAFER+ encryption algorithm. The information available suggests that Bluetooth security will be adequate for most purposes; but users with higher security requirements will need to employ stronger algorithms to ensure the security of their data.
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Game Player Battery Tips (1powershop)

Since Game Players consume batteries very quickly, what type of battery can I use as an alternate?Game Players consume batteries very quickly. We recommend using rechargeablenickel metal hydride batteries, as opposed to alkaline batteries. NiMH batteries will give you more pictures per charge and can be recharged hundreds of times, unlike alkaline batteries.What steps should I take to make sure to get the full capacity out of my Ni-Mh batteries?To help your new NiMH batteries reach their full capacity and performance, fully charge and then fully discharge it at least once every two to three weeks. Do not leave the battery dormant for long periods of time. If a battery has not been used for a long period of time, perform the new battery 揵reak in?procedure as described above. Also, consider investing in two sets of rechargeable batteries so you'll always have spares.Tips to conserve battery power.Here are some battery tips for conserving power. Limit the use of LCD and use the viewfinder whenever possible to frame a picture. And check the picture in the LCD only when there is a question of whether or not you got the shot. Rather than using the auto shutoff, manually turn off your. This will save a significant amount of battery power. When transferring pictures from your to computer, power your from the wall socket instead of the batteries. This can be especially useful when you're downloading photos or viewing them on your's screen.