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Routers could function just as well at 2. It's the rules. The 2. Microwave ovens heat food by blasting it with, literally, microwaves. It bears mentioning that in terms of electromagnetic waves, microwaves, the wavelengths of which range from a millimeter all the way up to a meter, aren't particularly "micro". At certain frequencies, such waves cause something call Dielectric Heating in water and fat, while passing straight through other materials, like plastic or glass, without exciting them much at all.
Metal, on the other hand, gets too excited. For a full explanation of how dielectric heating works, click here , but for the purposes of this article, just know this: Only certain materials are susceptible, and only when bombarded with waves of a certain frequency and power. One of those frequencies is MHz. Others fall at 5. But the one that proved to be both effective and relatively cheap to achieve was 2.
That's the frequency emitted by your microwave, right there in the kitchen. So, when the FCC got around to establish just which frequencies unlicensed gadgets could broadcast on, they had a lot of things to think about. First, they had to consider which frequencies were already in use by stuff like radio and TV.
Those would be off-limits. Then, of the remaining, usable, unallocated frequencies, they sought out the ones that were already being used by existing equipment. One thing they noticed? Microwaves were popular! They'd been around commercially since And generally, they operated at a specific frequency: 2. Whilst this not a completely accurate statement, it certainly gets you thinking in the right frame of mind.
As an example, in my own home, whilst I and my wife might be sporting a late model Android or iOS-based phone or tablet and using the much higher speed 5GHz network, allowing us to stream high-definition movies and the like to these devices wherever we are in the home, the hand-me-down factor to our plethora of children means that we have phones and devices which only two or three years ago were 2.
Our printers are both 2. We have photo frames with family pictures running in various places around our home, and these too are 2.
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