سلام به همه دوستان ، کسی میدونه تفاوت فرکانس های 900 و 1800 تو موبایل چیه ؟ اگه مقاله ای در این مورد دارین ممنون میشم واسم اپ کنین :nerd:
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کمتر به سایت میام ..... -
پاسخ : تفاوت فرکانس 900 و 1800
کسی مثل اینکه بلد نبود ..
خودم دست یه کار شدم اینم مقایسه کامل بین GSM 900-1800
Which is better, 850 or 1900? In general, you are going to get more performance out of 850 than you are going to get out of 1900 for several reasons. 1. As mentioned earlier, back
when the 850 licenses were issued, they had to cover a certain amount of land cover. This required deploying their system throughout many rural areas (not ALL though). 1900 licenses only need to cover up to 67% of the population, and in many cases they don't even have to meet that. 2. The higher the frequency, the shorter the usable range. You need approximately twice as many 1900 MHz towers to cover a given area than 850 MHz
towers. Most 1900 MHz towers are in urban and suburban areas. A properly built 1900 system will work as well as a properly built 850 system, but it will likely cost more to deploy and operate. Sometimes 1900 will work better in a city because 1900 MHz signals tend to work better in the middle of the city with large buildings as the shorter wavelength allows the signal to go around corners easier. Also, due to network loading, 850 towers have to
be "turned down" in urban areas so as to not overload, so the playing field is leveled. 3. Leaving the technical details aside, it seems that 850 MHz signals penetrate most modern buildings better than 1900 MHz signals. There are many factors involved such as the material of the walls, the proximity of the local cell towers and various other factors. The fact that 850 MHz carriers have been in operation longer and have optimized their coverage is an
important factor to consider. If there is a window nearby, chances are that either system will work, assuming that there is some sort of signal available at the window! The bottom line is this: when you try out a service, make
sure you bring your phone to all the areas you'll be using to make sure it works where you need it.کمتر به سایت میام .....
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