Electrical – What unlicensed frequencies can (or should) be used for proprietary wireless communication?

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I can see that most of the gadgets that use proprietary protocols use 433MHz, 915MHz, or 2.45GHz, but I don't understand why. 433MHz is highly regulated in the US and 915MHz can not be used in Europe. Why is that noone uses other frequencies?

What unlicensed frequencies can (or should) be used for proprietary wireless communication? Can you please help me finding a whole list of frequencies that can be used for an unlicensed wireless communication? And maybe some issues that has to ba taken into account when you select a frequency?

Thanks in advance!

Best Answer

Why is that noone uses other frequencies?

The radio spectrum is crammed full of users, some licensed, some military and there are a few spaces left over that unlicensed users are permitted to use. Here's what the US looks like: -

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If you want a more detailed view type in the link shown on the picture. You can also find details on line, for each specific band how you can use that band. For instance, maximum power, duty cycle etc..

Here's a little snap shot of more detail: -

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And for the UK there is this chart: -

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