first i guess i need to filter the air frequencies with a capacitator and coil but would be posible to set dipole antennaes in serie as to run anything?
Depends on the singal strength, and that can vary over a range of billions or more. A receiving
antenna might see 1mW, 1µW, 1nW, 1pW or less. Only when at the milliwatt level do you have
a hope of extracting enough power to light an LED, the typical level of nanowatts ain't going to
do anything, unless of course you put a million dipoles in series!!
Have a look in how a crystal radio set works
The signals are AC, so to add them, they would have to be mostly in phase. Good luck with that. Google, "bedspring antenna".
farolero777:
first i guess i need to filter the air frequencies with a capacitator and coil but would be posible to set dipole antennaes in serie as to run anything?
This is what professor Yagi did when he an Uda invented the Yagi antenna. The dipoles are mounted in series on a boom and phased so the signal received on one dipole is phased so when it reradiates the signal, it is in phase with the original signal going to the next dipole in line.
Since you did not mention the frequency, the physical size of the assembly is unknown.
I have on Yagi antenna with 18 dipole elements and is 33 feet long.
Paul
You are better off using a random long wire for extracting energy from a transmitter. You can do this if you are close to the transmitter. I know of one person who used to charge his 12V batteries from a loft full of a long wire. He was only 2 miles from a very powerful low frequency transmitter. He got two years in jail for misuse of electricity.
the thing is that the arduino analogic input gets from the air like 5 volts at a very low frequency of 1 hz of more than 5volts with wich connected to the arduino ground i can light a led
but for what i want to do it seems to much of a low frequency because the dipole should be huge
i think its the shumans earth frequency
so i was wondering if there would be a way to slow down the signal in one antenna, slowing down electricity or something as to get a phase offset of 180 degrees and get a voltage gradient from a second antenna
ive seen portable crystal radios with coiled antennas, i think with that you could power a led
Grumpy_Mike:
He got two years in jail for misuse of electricity.
That makes no sense.
If that is REALLY what you are after, then, as Wikipedia explains, you don't want a long antenna, as it picks up all the electric energy from the static charged air. You want to construct: The electric component is commonly measured with a ball antenna, suggested by Ogawa et al., in 1966,[26] connected to a high-impedance amplifier. The magnetic induction coils typically consist of tens- to hundreds-of-thousands of turns of wire wound around a core of very high magnetic permeability.
I also have a very large antenna, 540 foot horizontal loop suspended at 35 feet. It gets charged by blowing dust, blowing snow and rain such that I can see sparks when the ground switch is being closed. Your long antennas will suffer the same problem.
Paul
A loop antenna works fine near a microwave oven:
Paul__B:
That makes no sense.
Well it took them two years to find him. And the transmitter was the one that communicates with our nuclear submarines. And by chance alignment the result was a null in the transmitter exactly in line with Moscow.
ive seen portable crystal radios with coiled antennas, i think with that you could power a led
Do the maths on that, you will find the power needed is far greater than you get a few miles from a transmitter.
@GM: I still don't see what is wrong. It is a crime in GB to have a coil of wire? It was his responsibility to find where the power comes from? The whole transmitter thing was surely top secret so he even couldn't have known he is doing somethig wrong. Unless he was an employee of the transmitter ofc.
I still don't see what is wrong. It is a crime in GB to have a coil of wire?
No the crime is illegal use of electricity. Have you never heard of it?
It is a catch all offence that covers abstraction of electricity, it is normally used for people who do there own direct connection to the mains or bypass meters.
But it can also be used to get people who grow cannabis with power going through a meter.
Grumpy_Mike:
No the crime is illegal use of electricity. Have you never heard of it?
Well I am not a lawyer and do not live in the UK but such broad definition is strange. Anyway a piece of wire is (was) able to disrupt communication with the nuclear submarines for two years? There must be something more in the story. (Such as he was a skilled EE, knew this is a military frequency and made a tuned antenna to disrupt the communication "for fun".)
I learned of this story when I worked at the Admiralty Underwater Weapons Establishment.
He was just a farmer with no specialists knowledge of frequencies hence the very long wire in his loft. He had no idea what the transmitter was used for. In fact at the time the story was that it was for the time synchronising transmitter used for radio clocks.
Well I am not a lawyer and do not live in the UK but such broad definition is strange.
If you were a lawyer then you would not find such a broad definition strange at all. Most UK law is constructed on broad definitions and refined by case law after that.
We had one Indian member here who wanted to flash very strong UV LEDs in the eyes of drivers he disliked and insisted it was legal in India because there was no law specific forbidding it. He of course was wrong as assault charges would be brought, there is no long list of weapons that could or could not be used.
I have a sharp 12 inch bread knife and that is quite legal, but if I went round slashing people with it that could be considered illegal use of a bread knife. So you can have a coil of wire but you can’t use it to extract electricity for a purpose that the owner of the electricity does not intend it to be used for.
It took so long to find him because at first nobody knew what was causing this null and suspected that the Soviets has invented something.
Hi,
Was the farmer near Anthorn, Loran C aerial.
Tom... 
TomGeorge:
Hi,
Was the farmer near Anthorn, Loran C aerial.
Well I don’t know.
I know that transmitter, it is not far from where I live, and have driven round it. It is certainly a strange sight. Maybe you can drive round it on Google street view.
They have only recently moved the time function there and it sparked some local business to start making wrist watches that use it.
The location was never mentioned when I heard the story, I had always assumes it was around Rugby where the time signal used to be broadcast from.
apparently they comunicate with submarines at low frequencies with dipole antennas separated many miles away
the thing is arduino analogic input often caughtes a wave of aproximatly one hz
its the main wave you see if you put theanalogic input in the plotter
does anybody have a clue on what such a main low frequency is from
and could it be tapped without a ground as to set the receivers in serie
farolero777:
apparently they comunicate with submarines at low frequencies with dipole antennas separated many miles awaythe thing is arduino analogic input often caughtes a wave of aproximatly one hz
its the main wave you see if you put theanalogic input in the plotter
does anybody have a clue on what such a main low frequency is from
and could it be tapped without a ground as to set the receivers in serie
You could ALSO be seeing the difference or the sum of two or more waves. If you are looking at actual "waves", they are AC.
Paul