Radio output power: 32.5 dBm maximum (varies by country)
U.S.A version has the strongest signal (dBm),(mW) or all versions have the same harakteristikiversiya U.S. has the most powerful signal and power is determined by selecting a country in the settings of the router?
ME918 RU/A or ME918LL/A which model has more power signal?
and will it work ME918LL / A in my country?
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Apple has to comply with different country regulatory bodies. So Apple does in fact limit the signal strength and bands it uses based on what country you are using the AirPort Extreme in.
As to how they do that, as far as I know its not based on what you plug in as your location in the setup, they have different units that they sell.
Besides, if you are caught with a non compiling unit you could have your unit taking from you, face a fine or even jail time!
As for an an example some people had problems with their iPads when they first came out entering some countries and were taken from them as Apple hadn't gotten the needed certificates from some countries for their use.
Here's a useful link Microwave Exposure Limits by Countries. In it you will find the Ukraine emissions standard.
Just so you know you can use multiple units inter-connected in case you have a very large building (or open space). Just place them 1/3 the distance apart of the size of the building.
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I live in Ukraine.
ME918 RU/A model I should go but how much less power it on the model ME918LL/A ?
You do understand power only effects distance from the AirPort Extreme not the speed of the connection (if you are in the range of the unit).
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What country are you in?
Dan さんによる