Converting Radio waves into D.C Electrical energy

Pavlo138

Joined Feb 26, 2009
28
If you think he was serious, then you know nothing of the man or his contributions.
I didn't take him literally. I understood the quote to mean that there is more to understand then what is already understood. That is also how I interpreted my friend in our discussion of antennas. If he was wrong then so be it.
 

Wendy

Joined Mar 24, 2008
23,797
Over unity comes in many forms.

A popular theme in SciFi is to have solar farms in orbit (where the sun always shines) and beam the energy down to earth as microwaves. The power density can be quite low and still be effective, but the antenna farm will cover square miles.
 

radiohead

Joined May 28, 2009
514

AlexR

Joined Jan 16, 2008
732
As great as Tesla was in the field of power generation, wireless distribution of electricity was not one of his brighter ideas. He never made it work nor has anyone else since, other than over very short distances and at fairly low efficiencies.
 

Wendy

Joined Mar 24, 2008
23,797
As great as Tesla was in the field of power generation, wireless distribution of electricity was not one of his brighter ideas. He never made it work nor has anyone else since, other than over very short distances and at fairly low efficiencies.
Tesla was a genius of the 1st magnitude. There have been a lot of reports that he did make it work (though I wouldn't even try to guess at the efficiency). He did make mistakes, but his successes were a lot more frequent and impressive. I wish we had more info on his theory.

With all the attention I wouldn't be surprised if it wasn't "rediscovered". There were some powerful interests in burying it at the time.

I claim nothing with certainty, I just don't think all the facts are in yet. As in the microwaves, there are other forms of broadcast energy that may be exploited.
 

k7elp60

Joined Nov 4, 2008
562
On way of looking at an antenna is: The antenna matches the impedance of the transmission line to the impedance of air.
Another person who claims to have gotten great amounts of electrical energy from the atmosphere was T.H. Moray. There is more written about this in book called the sea of energy.
Doing a google search for T.H. Moray gives a lot of hits.

Several years ago I built an active antenna for the AM broadcast band. This consisted of a parallel resonate circuit, RF amplifier and then a emitter follower. The antenna was a telescoping whip about 20 inchs long that was connecte to the hot side of the parallel resonate circuit. I was about 10 miles from the closest AM transmitter. I had 2 volts peak to peak amplitude on hot side of the resonate circuit at the frequency of the local AM transmitter.

On the same token I have been able to have florescent tubes illuminate in a strong RF field. This was near the transmitting antenna

The point I'm trying to make is that the magnetic field of a radio transmitter is so week at a considerable distance that to get a usuable amount of energy is not possible.
 

Wendy

Joined Mar 24, 2008
23,797
I think anyone who understands theory can differentiate between deliberately harnessing power created for the purpose vs. trying to take advantage of what is out there. Lasers and Masers make concentrated beams for the purpose, instead of omnidirectional broadcasts where the inverse square law rules.
 

Alec_t

Joined Sep 17, 2013
15,132
Welcome to AAC!
How do you know those guys made it work? I see no evidence in that link that this proposal would actually be practical. Wouldn't you have to stand around all day every day close to a powerful cell-phone transmitter? All I see is an invitation for people to part with their cash!
BTW, you are more likely to get a response if you start your own thread rather than dig up an old one. It is bad practice to hijack someone else's thread.
 

papajo

Joined Jun 21, 2015
12
You can charge a battery from solar cells easier and faster than from an antenna.
"How to charge a batter faster?" is an other question in my opinion and your argument belongs to that question.

Here the thing is how much time can we use devices between charges and this patent seems to increase that time by 30% which for a prototype isnt bad...
 
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