Electric from radio??
sensible
waves, please?
See this video...it has an antenna attached to a circuit of capacitors
and other stuff, and gets out volts from the other end....Does this
work? And if so, how does it work?
Thanks.
http://www.metacafe.com/watch/915226/free_electricity_from_thin_air/
Wayne Throop
: Can anyone tell me whether you can get electricity from received radio
: waves, please?
It's pretty much inevitable, since the act of "receiving radio waves"
involves having the radio waves move electrons around, most often
resulting in teeny tiny electric currents in the antenna.
The question is, how *much* "electricity" is involved.
How large the current, how high the voltage, etc, is the question.
But remember that the original radio receivers actually directly induced
a spark across a gap of air by receiving radio waves; that's how they
were discovered, pretty much. See also, Tesla.
It's rather the same issue as "can you get mechanical motion from received
sound waves". Well... yes, you pretty much have to. You hear sound
waves because they move your eardrum, and the various little bitty bones
in the inner ear, and fluid in the cochlea, etc.
Of course, if parts of the cochlea have been damaged by exposure to very
loud environments, one often can't hear what's said, and has to ask
people to repeat things. This can cause one's family to become quite
angry at one. However, *I* think a man's hearing should be judged not
by the choler of his kin, but by the content of his cochlea.
Wayne Throop thr...@sheol.org http://sheol.org/throopw
Brian Davis
> Can anyone tell me whether you can get electricity from received radio
> waves, please?
Yes. Pretty laughable video there as well. PT Barnum would be proud.
--
Brian Davis
Derek Lyons
>However, *I* think a man's hearing should be judged not
>by the choler of his kin, but by the content of his cochlea.
Bra/vo/! Well played!
D.
--
Touch-twice life. Eat. Drink. Laugh.
http://derekl1963.livejournal.com/
-Resolved: To be more temperate in my postings.
Oct 5th, 2004 JDL
Michael Ash
> Can anyone tell me whether you can get electricity from received radio
> waves, please?
> See this video...it has an antenna attached to a circuit of capacitors
> and other stuff, and gets out volts from the other end....Does this
> work? And if so, how does it work?
For an obvious proof, look at a crystal radio. Its only power input is its
antenna.
For a somewhat less obvious proof, consider solar cells. They use light,
not radio, but they're both just electromagnetic waves, merely with
different frequencies.
The problem, as mentioned in another post, is not obtaining energy, but
obtaining useful amounts of it. This is simply because there aren't enough
ambient radio waves around to generate a significant amount of
electricity. Solar power is (somewhat) useful because there's a whole lot
more visible light flying around than radio.
--
Mike Ash
Radio Free Earth
Broadcasting from our climate-controlled studios deep inside the Moon
sensible
SolomonW
> sensible <flan...@googlemail.com> wrote:
> > Can anyone tell me whether you can get electricity from received radio
> > waves, please?
> > See this video...it has an antenna attached to a circuit of capacitors
> > and other stuff, and gets out volts from the other end....Does this
> > work? And if so, how does it work?
>
> For an obvious proof, look at a crystal radio. Its only power input is its
> antenna.
>
> For a somewhat less obvious proof, consider solar cells. They use light,
> not radio, but they're both just electromagnetic waves, merely with
> different frequencies.
>
> The problem, as mentioned in another post, is not obtaining energy, but
> obtaining useful amounts of it. This is simply because there aren't enough
> ambient radio waves around to generate a significant amount of
> electricity. Solar power is (somewhat) useful because there's a whole lot
> more visible light flying around than radio.
>
>
It is being done now for specialized applications. Eventually it maybe
used for many devices as a replacement for batteries.
http://www.memagazine.org/contents/current/features/wholenew/wholenew.ht
ml
Allen Thomson
> Can anyone tell me whether you can get electricity from received radio
> waves, please?
Yes, you can.
See
http://www.mtt.org/awards/WCB%27s%20distinguished%20career.htm
http://www.kurasc.kyoto-u.ac.jp/plasma-group/sps/history2-e.html
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1147518
Also google "microwave power transmission" and "wireless power
transmission"
WaltBJ
> On Oct 22, 12:28 pm, sensible <flanto...@googlemail.com> wrote:
>
> > Can anyone tell me whether you can get electricity from received radio
> > waves, please?
The Okinawans in the village near the Voice of America transmitter
could power fluorescent lights with a aerial and a ground hooked to
opposite ends of the tube.
Plus our old F86D fighter radars would light up a regular long
fluorescent bulb at 100 yards.
Walt BJ
Raven
news:b271419e-12d3-4ad4...@v56g2000hsf.googlegroups.com...
> > On Oct 22, 12:28 pm, sensible <flanto...@googlemail.com> wrote:
> > Can anyone tell me whether you can get electricity from received radio
> > waves, please?
> The Okinawans in the village near the Voice of America transmitter
> could power fluorescent lights with a aerial and a ground hooked to
> opposite ends of the tube.
> Plus our old F86D fighter radars would light up a regular long
> fluorescent bulb at 100 yards.
You can get the same near high-volt pylon lines.
Jon Lennart Beck.
Terry
"Raven" <jon.lennart.be...@mail.its.in.danmark> wrote in message
news:4903a305$0$15881$edfa...@dtext01.news.tele.dk...
But thats not radio waves.
TerryS
Steve Hix
"Terry" <ste...@sbcglobal.net> wrote:
Sure it is; it's electromagnetic fields in low (and high) frequency
radio bands.
Netmask
"sensible" <flan...@googlemail.com> wrote in message
news:3d65a59d-ed19-4443...@e17g2000hsg.googlegroups.com...
simple answer yes but the efficiency is really low. There was described a
unit in Hobbies Illustrated some 40 years ago that basically was a glorified
Xtal set with 2 tuners - one was a narrow band superheterodyne unit that
you tuned to the strongest local AM radio station - that signal was detected
and rectified to produce a small DC voltage to "power" a small transistor
that feed a pair of headphones. The other tuner was a wide band TRF unit,
for good quality, and this tuner was the one you used to select the station
you wanted to listen to... I built one from a kit supplied by a company
called Radio House in Sydney Australia as a student project. pretty basic
and it did work quite well. I might even have the circuit in my archives -
very simple but whilst you can get usable voltage from a RF signal this way
the current or amperage is next to nothing so it will really only work with
voltage driven devices - loudspeakers would be out of the question.