Guy harvesting energy from the Grid using a simple radio antenna? - Page 1
Forum section: electronics / general

author: riyadh144
author_rank: Unknown
timestamp: May 28, 2016, 06:40:31 pm
content: https://youtu.be/uG8W9NfVzx0For me I don't believe him for a second. First of all if you look at his multimeter the probes are connected to the volts and amps, and he is measuring voltage from a transformer using DC, and he is supplying power to a car charger without any regulation. Not to mention the crappy antenna he is using.

author: edy
author_rank: Super Contributor
timestamp: May 28, 2016, 08:45:26 pm
content: Quote from: riyadh144 on May 28, 2016, 06:40:31 pmYou don't even have to look at what he is using, or understand Russian. Just go back to fundamental science and try to understand if you can "harvest" energy from high voltage power lines above your head. Just think about a few things.1) high voltage 3-phase bundled AC is passing through the lines above youYou will generate a magnetic field around each of the transmission wires. They will theoretically induce current in another loop of wire if you place it around it.... i.e. a Current Clamp.So..... Is this guy looping around any transmission wire? No. From where he is standing, there is no way to harvest the alternating magnetic field that presumably is coming off one wire, certainly not to any meaningful current. And to make matters worse, the 3-phase AC lines will be cancelling each other at various times throught the cycle, as they are 120 degrees out of phase with each other. Sure you can maybe detect the magnetic field as "interference" on your oscilloscope, but you are not going to do any meaningful work (like charging up a phone or firing off a spark-plug).2) is the high voltage AC at a high enough frequency?Microwaves and other high frequency radio transmissions can be used for power transfer. They are usually focused beams, since otherwise the energy per unit of receiving area would drop off as the square of the radius distance from the source. Here you have energy radiating in all directions, at a pretty low frequency, and also with 3 phases you are going to have cancellation effects due to having them combining.Sort of reminds me of this B.S. article.....http://www.extremetech.com/extreme/148247-german-student-creates-electromagnetic-harvester-that-gathers-free-electricity-from-thin-airIt says in the article, and I quote:QuoteI see another IndieGogo campaign in the making....Bottom line, the video is a hoax. Even in Russian.

author: Gyro
author_rank: Super Contributor
timestamp: May 28, 2016, 08:51:40 pm
content: This subject was discussed at length last year...https://www.eevblog.com/forum/projects/energy-harvesting-the-legal-poop/

author: edy
author_rank: Super Contributor
timestamp: May 28, 2016, 09:02:58 pm
content: Quote from: Gyro on May 28, 2016, 08:51:40 pmThanks. Good review. Basically the guy in the Russian video seems to be boasting about receiving energy by antenna, or transmision. As far as inductive coupling to another adjacent circuit and harvesting energy that way, I see nothing in the video to suggest he is doing that.

author: ataradov
author_rank: Super Contributor
timestamp: May 29, 2016, 03:20:07 am
content: That's one of those "trying to go viral and cash in" channels. They will show any sort of garbage to get views.