Re: Deriving power from broadcast signals
- From: "Phil Allison" <philallison@xxxxxxxxxx>
- Date: Thu, 21 Jun 2007 16:00:54 +1000
"George"
I'm planning to develop a simple radio receiver module that must be small
and have long battery life.
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?
** Forget it.
The power received by a small antenna is only a microwatt or two - plus
there is not practical way to convert it into a DC supply.
........ Phil
.
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