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Knowing Your Cell Phone

The cells are usually depicted as hexagons. The unique frequency tiers avoid all possibilities of cross connections. Generally a carrier of cell phone can avail of 832 radio frequencies in a city. Each cell phone (celular) uses 395 voice channels (per carrier), that is 56 voice channels per cell. It means 56 persons can simultaneously say hello on the phone. In digital transmission technology the number of channels increases even further. For each cell phone 168 channels is available.


Scan A Business Card Into Act - Easily Scan Cards Data to Act!

Looking for a portable scanner? if you are considering to find a way to scan a business card into act and you could use some advice on which one to buy, then you just have to listen to some good advice on the subject that will make the process of researching and buying a scanner a lot easier. The use of a compact scanner can actually revolutionize the way you handle digital data, most of all when saving crucial documentation is a major consideration. So before you decide to purchase a portable scanner, we suggest that you read the following guide.


How Does a GPS Work?

So imagine yourself holding your GPS and standing in a big circle (See: "A" in the above image) on the ground. This reflects the information from a single satellite.

The GPS will do the same thing with the other satellites with which it can communicate via a clear line-of-sight. So for the second satellite, imagine another circle which intersects with the first. (See: "B" above) This second calculation will put your near the intersection of the two circles (See: "A^B").

Then add a third satellite and another intersecting circle. This third calculation will place you in the intersection of the three circles. This is considered a "2D" (or two-dimensional) mode, figuring your location horizontally only. In this case, you can input your elevation, if you know it, for more accuracy with the GPS unit. Keep in mind that 2D navigation can be unreliable.

If your GPS can communicate with 4 or more satellites, your location will be more accurate and you"ll be in "3D" mode, which will include an elevation calculation. This is what you"re aiming for.

Your unit display will indicate whether you are in 2D or 3D mode. If it"s displaying 2D, try moving around and getting into a more open area, free of obstacles like tall trees, to hopefully get to 3D mode if at all possible.

**You should always check your "EPE" or "Estimated Position Error," which will display on your GPS, usually right on the same screen that indicates how many satellites it"s communicating with--the satellite page. This will also show you how accurate, or perhaps inaccurate, the position fix is. An EPE of 20 feet or less is good. The lower the EPE the better.






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