[OT] Power over radio is it a true thing or just a myth ?

[Micha]

On 8/23/2009 3:03 PM, Boris shtrasman wrote:
> Sorry for the OT ,
>
>
> But i guess using systems in other ways then they had been designed is a
> bug that not only i posses.
>
>
> I heard a lot about wireless power transition , while I heard about
> products that provide close distant power transmitting (1) what about
> using public wifi in my area ?
>
>
> I met many people that "heard" about some one that know some one that
> has access to device that uses radio signal to transfer low amount of
> power in short ranges.
>
>
> As i googled about it i guess it can be done using rectennas but only in
> close range to _High_ power radio transmitters (2)
>
>
> My question is it possible to be done with small radio signal equipment
> as Wi-Max and Wi-Fi ,Perhaps even with the new terrestrial transitions.
>
> Do any one have links to this kind of devices ?

I don't have a link now but I saw a thread somewhere about the myth of stealing 
power from powerlines with a large coil, and the calculation came to the point 
if I remember the numebers correctly that you may be able to run a 1.5v light 
bulb using several tons of copper if your are several feet from the power line.

I doubt wifi is any better in this respect.

>
>
> (1)
>
> http://www.economist.com/sciencetechnology/tq/displayStory.cfm?story_id=13174387
>
>
> (2)
>
> http://www.telegraph.co.uk/technology/3336114/Over-to-you-Mythical-electricity.html
>
>
>
>
> 10x in advance.
>