Monthly Archives: February 2010

Bluetooth Technology Intro

The technology of Bluetooth is nothing new, but in
many respects it can still seem like more of a buzz
word rather than an accepted technology. You may
see the ads for Bluetooth enabled devices, although
you still may be wondering what it is.

Capabilities
The Bluetooth definition is a wireless technology
that is a worldwide specification for a small form
factor, low cost solution that will provide link
between mobile devices and other electronic
devices.

Similiar to 802.11 b/g wireless and many cordless
telephone systems, Bluetooth operates on 2.4 GHz
radio signals. The 2.4 GHz band seems to be a bit
crowded, with interferences between the devices a
bit hard to avoid. Telephones are now being offered
at the 5.8 GHz frequency band, which will help to
remedy this.

The technical specifications of Bluetooth will
indicate a maximum transfer rate of 723 kbps with
a range of 65 – 328 feet, all depending on the
class of that particular device. The speed is a
fraction of what is offered by wireless standards,
so it’s obvious that Bluetooth doesn’t really
pose a threat to replacing your wireless network.

Applications
There are numerous products that will take advantage
of Bluetooth capabilities, such as laptops, PDAs,
headphones, and even wireless printer adapters.

A lot of laptops out there will include an onboard
Bluetooth adapter which allows the system to
connect to any Bluetooth device right out of the
box. For computers that don’t have an adaptor
built right in, there are several USB adaptors
available for Bluetooth.

For an awesome technology, Bluetooth is actually
hard to compete with. For short range wireless,
Bluetooth is easily one of the best. The standard
for Bluetooth keeps getting better and better,
making it a wireless technology that will be around
for years and years to come.

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How Bluetooth Works

Bluetooth devices will normally operate at 2.4 GHZ
in the license free, globally available ISM radio
band. The advantage to this band includes worldwide
availability and compatibility. A disadvantage to
this however, is that the devices must share this
band with other RF emitters. This includes
automobile security systems, other wireless devices,
and other noise sources, such as microwaves.

To overcome this challenge, Bluetooth employs a
fast frequency hopping scheme and therefore uses
shorter packets than other standards within the
ISM band. This scheme helps to make Bluetooth
communication more robust and more secure.

Frequency hopping
Frequency hopping is basically jumping from frequency
to frequency within the ISM radio band. After a
bluetooth device sends or receives a packet, it
and the device (or devices) it’s communicating with
hop to another frequency before the next packet is
sent. This scheme offers three advantages:
1. Allows Bluetooth devices to use the
entirety of the available ISM band, while never
transmitting from a fixed frequency for more than a
short period of time. This helps insure that
Bluetooth conforms to the ISM restrictions on the
transmission quantity per frequency.
2. Ensures that any interference won’t
last long. Any packet that doesn’t arrive safely
to its destination can be resent to the next
frequency.
3. Provides a base level of security as
it’s very hard for an eavesdropping device to predict
which frequency the Bluetooth devices will use
next.

The connected devices however, must agree upon the
frequency they will use next. The specification
in Bluetooth ensures this in two ways. First, it
defines a master and slave type relationship between
bluetooth devices. Next, it specifies an algorithm
that uses device specific information when
calculating the frequency hop sequences.

A Bluetooth device that operates in master mode can
communicate with up to seven devices that are set in
slave mode. To each of the slaves, the master
Bluetooth device will send its own unique address
and the value of its own internal clock. The
information sent is then used to calculate the
frequency hop sequences.

Because the master device and each of the slave
devices use the same algorithm with the same initial
input, the connected devices will always arrive
together at the next frequency that they have agreed
upon.

As a replacement for cable technology, it’s no
wonder that Bluetooth devices are usually battery
powered, such as wireless mice and battery powered
cell phones. To conserve the power, most devices
operate in low power. This helps to give Bluetooth
devices a range of around 5 – 10 meters.

This range is far enough for wireless communication
but close enough to avoid drawing too much power
from the power source of the device.

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Auto Navigation Systems Offer Unparalleled Assistance

In this day and age of personal assistants, personal shoppers, personal chefs, and all too personal personals it only makes sense that now we have what is jokingly (in many cases) referred to as a personal navigator. Many newer cars, particularly luxury models, are beginning to offer auto navigation systems to drivers as incentives to purchase or as part of luxury packages and upgrades. The idea of that little extra security and luxury is quite appealing to many drivers, especially those of us who could get lost in the mall parking lot if exits weren’t clearly marked.

The truth of the matter is that even if you elect not to pay the premium upgrade costs that car makers are adding to the price tag for the luxury of those devices it is quite possible to have the protection and peace of mind that auto navigation systems afford drivers on even the most meager of driving budgets. Facts are facts and getting lost costs time and money while stopping to ask for directions is a risk in and of itself. If you spend a lot of time on the road you really can’t afford not to have some sort of navigational device to assist you in getting safely and securely to your next destination.

If the fact that you can purchase these devices rather inexpensively isn’t enticing enough for you, I should add that most are quite simple to install yourself. Many of them require nothing more than the ability to stick a suction cup to your windshield and plug an adapter into a cigarette lighter. I did mention that installation was simple didn’t I? For those who would rather have a more elegant look in their automobiles you are perfectly free to pay a lot more for an in dash system and installation by professionals. You can occasionally get a good deal on installation if you purchase an auto navigation system from certain retailers.

You should keep in mind however, that in dash systems tend to cost a great deal more than those you install yourself and you can’t take them with you when you sell or trade the car. For these kinds of systems you need to consider the value to you verses the value improvement to your vehicle. Will the in dash system raise the value of your car when you are ready to trade in your car or will it make no real difference in the value of you car? If the answer to that is no, then it may be a poor decision from a financial point of view. However, if having a system that isn’t part of the dash will lower your perceived value of your automobile then it is a worthy investment. Ultimately, you are the only one that can determine whether this is worth the price and the investment.

If you decide not to go with an in dash auto navigation system you might be delighted to know that there are a world of options available to you. Not only do you have the stand-alone navigation systems that are already loaded with all the data and information necessary to operate but you may also choose software and hardware that can be added to your PDA or laptop as well as handheld navigational units that can be upgraded to operate as mapping units in addition to basic GPS units.

When all is said and done you must decide which type of auto navigation system you want for your car and your lifestyle. Decide what your actual navigation assistance needs are and choose the device and assistance that is best for your family. If you’ve ever been hopelessly and utterly lost I believe you will agree that there really is no price too great to pay in order to never experience that feeling again. I know I am perfectly willing to pay top price for my personal navigation assistant, though I will continue to search for the best possible bargain for my navigational dollar.

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Auto Navigation Systems that use Laptops or PDAs

You may or may not be aware of the many options on today’s market when it comes to auto navigation systems. Take my word for it there are now more options than ever before with new options appearing daily. Among the many options that are available for those of you who are interested in obtaining equipment that will assist you in finding your way on long and short trips there are options that can be used along with your laptop or PDA devices. If you currently own and use on a regular basis a laptop or PDA the software or other devices and receivers that are required in order to utilize your laptop as a GPS device aren’t nearly as expensive as purchasing a stand alone auto navigation system.

In fact, as far as money savers go, this is a great way to save money on your purchase and receive the same great benefits that some of the top of the line auto navigation systems has to offer. You will find these types of devices that are geared towards as many different budgets as the actual stand alone systems. Some of the more popular of these tools include the following:

1) US Global Sat BU-353 USB port GPS Receiver. This nifty device costs less than $100 and allows you to turn your laptop or pc into a GPS. This is a great feature for finding directions and attaches to your laptop through the USB port.

2) DeLorme Earthmate LT-20 GPS. This is also a little less than $100 and gives your laptop fully functional navigation features. This not only works with laptops but also with Palm OS. You will experience rapid satellite acquisition and you have the Street Atlas software to guide you towards your destination. The software is included with the Earthmate. This software will even recalculate your directions should you miss a turn along the way. For the price, I highly recommend this if you have a PDA or laptop already.

3) DeLorme Earthmate Blue Logger Bluetooth Wireless GPS. This is another nifty tool by DeLorme. This device will allow you to receive a real time image of your location but requires an unobstructed view of the sky in order to accurately record its current position. This device also works with Street Atlas software in order to assist you in charting your course and giving proper driving directions.

4) Tom Tom Navigator 6 Bluetooth. If you are looking for feature rich navigation then this is certainly the tool for you. This is useful with laptops and Palm systems. Not only will you find mapping technology that is quite superior but you will also find useful things such as parking garages, fueling stations, and restaurants along the way.

You will notice a great variety of prices and features with these devices. The important thing to remember is that you want the same or better features for less with this type of equipment since you are providing either the laptop or the PDA. If you already have the laptop or PDA you should be able to save a tremendous amount of money over the costs of purchasing a stand-alone auto navigation system. If you aren’t getting an incredible bargain you might want to debate whether or not the system you opt for really is the best system for you.

Perhaps the most important thing to keep in mind is the fact that your laptop or PDA can become an important tool in keeping you on the right track when traveling. You may be one of the lucky few who has never gotten lost while traveling (or one of those who refuses to believe they are lost) however, if you aren’t then perhaps it is time to seriously invest in either software, equipment, or devices that can help you find your way whenever you are lost. Laptop and PDA equipment offer great alternatives for those who need navigational assistance but need to remain within a strict budget.

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Auto Navigation Systems are Aids not Replacements for Attentive Driving

If you are in the market for an auto navigation system you are definitely not alone. Some people are content to purchase a device, stick it in their windows, and hope it works well whenever the need arises. For those, it is quite likely that most stand-alone navigation units will work quite nicely. The thing to remember is that not everyone is created equal when it comes to primary or even secondary navigational skills. For that reason alone, not all auto navigation units are created equally either.

Don’t expect your auto navigation system to replace a ‘co pilot’ by any means but it should definitely do in a pinch and be more than capable of helping you get through a few lost moments while stuck in traffic, detouring, or taking a country drive. You won’t have a natural conversation with your navigational system no matter how much the television commercials attempt to convince you that this will be the case. You can however get great details about every single turn of your trip including details about landmarks you should see along the way.

You should be aware that when you miss a turn the alternate route isn’t immediately forthcoming. Computers contain data and it takes a moment to go through the mountain of data sometimes in order to come up with an alternate route. Be patient when dealing with your auto navigation system and it should serve you well both in times of crisis and during your regular daily driving. I know this isn’t always too terribly easy in high stress situations but when you look at it, using a navigation system is a far cry better than relying on maps that must be dug out, dusted off, and translated or an inability to read a map and ending up even more lost than you were to begin with.

Even the best auto navigation system on the market isn’t a replacement for attention to details, seeing and remembering important landmarks, and paying attention to street signs and what lies ahead. The good news is that the technology for these systems is constantly evolving and improving. Data is synching much more rapidly than ever before and more and more often you are finding much more intuitive and user-friendly interfaces. The maps that are provided onscreen (in the more sophisticated versions) combined with the verbal directions and details work together in order to create a great driving experience, which would otherwise be filled with uncertainty, doubt, and no small degree of stress.

Regardless of how effective the auto navigation system you choose is, it only matters how effective you feel it is. If it gives you the directions and insights you need in order to reach your destination safely and on time, then I really can’t find fault in the system and would hope that you would not either. There is no such thing as problem free in this day and age and these systems are only as good as the mapping data that they have. The really good news, however, is that data is more often accurate than inaccurate and in most cases you can easily reach your destination.

When selecting an auto navigation system you should really consider how often you travel and how often during that travel you wish you had an alternate route or at the very least an option for your directions, how often you find yourself lost and clueless and needing to ask for directions, and how often you really feel you will use the device you decide to purchase. If you don’t feel you will get the most possible use of your navigation device, then consider one that can be used outside the automobile as well or at the very least one of the less expensive versions. You want to get your money’s worth from whichever device you choose for your auto navigation system.

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