Tuesday 3 July 2018

rf - How this device "Electronic Anti-lost-Anti-theft-Flashlight" measure distance?


Sorry i don't speak english but ill try.


We want to design a system of a receiver and transmitter in RF, that it "beeps" when it is a certain distance one of each other.


I found this: http://www.amazon.com/Electronic-Anti-lost-Anti-theft-Flashlight-receivers/dp/B00QNE6QWI



It works 433.92M Hz.


So my question is, how this system measure the distance? i want to design something like that.


Sorry for my bad english, ill hope was understandable.




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