you dont need to be so diplomatic and un necessarily polite; the letter that we are talking about and many such , that I have read in my short CR4 experience Sur realistic to put it mildly
since me too am from a non english speaking country with weak command over the language as would be obvious from my letter ;I understand the problem .
is it possible to device a problem/ question /suggestion sort of format for people like us; just thinking aloud !
I don't want to burst any bubbles here but I think I under stand what the Guest was looking for or asking about.
I have the same question in a sense of the words.
I believe Guest was asking about why we don't have a way of converting digital signals into AC power for our use as to run electrical motors etc.
Now to explain what I am thinking. If we can send RF radio frequency's to where ever and decipher it into audio why not use this Rf for other uses Ie Power to run lights or motors. I realize that we only receive this rf in the micro volt range But lets amplify it to a usable Voltage.
Just think of all the different Freq. that are bombarding the earth from different sources 24/7 Satellites, AM broadcast and even cell phones are transmitting a source of RF, Lets harness this source of power, If we aren't already.
Radar, i think you answered your own question there, when you stated that the recieved signal is only microvolts which of course means the recieved signal is only in the nanowatt region.
Hardly enough "....to power lights and motors..." eh?
John.
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A little knowledge is a dangerous thing - Googling is far worse!
I still think that there should be a way. The engineers in electronic theory
can work on this in such a way that all freq. be it 0.2 Kilo Hertz or 10 Gigs (joules).
Can be received at a receiving station then fed to a central point and converted to a usable source of power. This theory would probably require more that one receive station as one would be required to supply the power for the amplification of the second then build on that. (Don't sound cheap to start).
This is hinging on Perpetual motion Other than some one else is suppling the original source of power be it Nano watts or in the milliampere Range.