Re: Deriving power from broadcast signals
- From: Robert Baer <robertbaer@xxxxxxxxxxxxx>
- Date: Thu, 21 Jun 2007 08:10:03 GMT
George wrote:
I'm planning to develop a simple radio receiver module that must be small and have long battery life.Best bet is to get power from AM stations; a simple crystal set for each station would do if you need a fair amount of power, but in (and near) large cities, tune to the most powerful.
It won't be required to produce audio output, and won't have user indicators, so I estimate power consumption will be well under one mW. It will have a small (say one foot long) antenna and will be used in cities where strong broadcast signals exist - say, 30 HF/VHF/UHF stations each with 50 kW radiated power within a ten-mile radius.
So the question is: Is it practical to use rectified ambient RF energy as a supplemental power source in order to extend battery life?
Any pointers on where to look for additional info will be appreciated.
George
.
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