Those 433 MHz devices put out milliwatts. TV transmitters run megawatts. The field strength falls off as the square of distance. Your additional exposure will be orders of magnitude below background.
-- Never hold a radio transmitter against the side of your head.
I am planning to buy a home weather station with a remote temperature sensor (wireless, ie using radio transmission at 433 MHz).
I am trying to figure out how the intensity of the electromagnetic field we would have indoor caused by this radio emitter would compare to that ambient, background, field (caused by radio and TV emitters, cell phone relay stations, other electronic equipment, etc.). The manufacturer does not give information on the power of the radio emitter (or on the exposure we would get fom it).
World Health Organisation gives a typical value for background exposure to such exposure (0,1 W/m2) to radio and TV emitters. What would be the exposure for the radio sensor?
Thanks for any help
Alain
TV Mast = 1MW Weather station = 10mW (say)
1MW / 10mW = 100,000,000 Square root = 10,000Therefore field strength 1 metre from weather station is equivalent to TV mast 10km away.
Apologies, I was not clear in my previous question. I meant references to the specs or a manufacturer of such small radio devices. I'll go and search internet anyway. Thanks again. Alain
"Alain Henry" wrote: > Apologies, I was not clear in my previous question. I meant references to
If you can't easily find the info, I ran the RF safety calculator on an U. of Texas website. At 433MHz, and a distance of 20 feet from the antenna, 1,650 watts is the threshold of a safety problem. With a sensor broadcasting from the top of your house, no one else living within hundreds of miles of you could operate such a device due to interference! And it sure couldn't be battery powered....
Reg, Fred F.
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