I used 14 gauge enameled copper wire wound on a 4 inch PVC pipe.

Its been several years since I built it so I have no idea what the number of turns or any other factors were.

Sorry but I had to look them up and think about it! So can you!
I gave you the basic design concept and how it probably works theory behind it, now you have to fill in the rest!

There is no mystery materials or stuff like that.
Just copper wire, PVC pipe, a variable capacitor, and some aluminum foil for the primary side.
The secondary was more copper wire, a second variable capacitor, and some ultra fast diodes.

Its all just common Tesla coil formulas and some radio receiver formulas mixed together. And fair amount of applied math!

__________________
"Issue a general safety warning. Then look the other way and allow stupidity the chance to eliminate itself." -- tcmtech
"Those who can, Will. Those who can't, will achieve positions of power over those who can and then promptly stop them." -- tcmtech
"Your impossibility may just be my day to day routine." -- tcmtech

 

I'm going to read more about it. thak you a lot.


All information for the design of the opamps in the circuit found here The Integrator
A Difference Amplifier

Got to make some test and it's ready.

 

It was moved because this is the more appropriate forum, with many other similar threads already.

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Incidently, while we're discussing RF power - there's always been a story from Germany, a LONG time ago, about a multi-megawatt AM transmitter, where locals supposedly heated their greenhouses from it. By building large resonant circuits they were able to capture relatively large amount of the RF energy, and dump it into heating elements.

The story goes that it all came unstuck when the broadcaster noticed their transmission range had dropped considerably in a particular direction - where there was a valley full of greenhouses.

It's not 'free energy' you're stealing it, and presumably it is an offence?.

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Hum not sure how were they doing that but it's ok. Thank you for your answer.

I made first tests with the circuit it is not finished yet but the counters act like a range selectors as he wrote on the drawings, its very high precision circuit I could even in 10khz range goes almost hz o hz and very stable frequency when lock led is on I need to finish the feedback and the resonant scanning circuit.

with 1 uf capacitor - 10k+200k R2 - 10K R1 -100k R3 -and 10k R4- Cf10n- it generated as predicted on my calculation 9 to 98 hz and with the first counter 7490 it went to 100 to 150 hz

With 10n capacitor it generated 998 to 10khz and with the counter from 10kz to 15kz.

I think the counters allow you to have a smaller bandwidth.

 

I would like to see a radio station prove you are stealing their power in court! A typical judge would tip over back wards in his chair laughing at that one!

Radio stations broadcast their signal for free. As far as I know taking some thing that is free is not stealing. Plus AM gets interference and shadowing from odd naturally occurring phenomenon too.
( but yea I have read about stuff like that where a number of times people have done similar things, I know its likely true.)

It would be hard to prove someone was stealing energy from a radio transmitter sense most people that would know anything about radio transmitters would say current RF wave propagation physics dictates its impossible to take energy from a transmitter and have them see it as an additional load.

Some years ago I made a pair of matched Tesla coil type transmitter and receiver units and actually demonstrated a strong and very measurable loading effect on a transmitter power source will taking power off the receiver.
Part of that experiment is what I was referring to in the earlier post. The part about by educated accident happening to hit a radio stations frequency and being able to get weak electrical power from it.

I Had two local college electro physics professors grinning from ear to ear for about at week while they played with my power transmitter and receiver set up!
By the way the receiver coil sat at a 90 degree angle to the transmitter and used no actual ground or physical connection with the other coil.
It just used pieces of regular aluminum foil for antennas. And it could run a 12 volt 24 watt light bulb at full brightness so it was considered proof that low voltage with a reasonable current could be pulled off of the receiver unit.

They flat out said I proved Tesla's power transmission effect was possible and it in fact defied every physics law they could come up with to properly explain it.
Its the only time I have every shown a college professor a home made device that did something out of the ordinary and did not get the deaf ear blind eye treatment.

__________________
"Issue a general safety warning. Then look the other way and allow stupidity the chance to eliminate itself." -- tcmtech
"Those who can, Will. Those who can't, will achieve positions of power over those who can and then promptly stop them." -- tcmtech
"Your impossibility may just be my day to day routine." -- tcmtech

 

I don't know if I trust that story so much, sure you can get some energy from RF, but at any appreciable distance the power drops incredibly fast, though I'd love to see someone that can do the math work it out to see if it's possible.

I wish I knew what I know now when I was 15, then I lived less than 1000 feet from every major TV station in Rochester and a huge number of microwave relay towers. Ghosting and reception at my house was impossible because the more receiver was just overwhelmed. With the right antenna array probably could have powered a few small lights =)

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tcmtech sorry, but blocking a radio transmitter (by absorbing it's power) is considered interference, direct FCC violation in the states at least. If there are similar laws there the judge would summarily judge against the green house users before there was even a trial. If it were a natural or structural phenominon it'd be understandbly vague, but if the people were doing it intentionally then it'd be illegal. I still don't see how enough power to effectivly heat even a green house could be gotten at any appreciable distance.

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True, but given the standard and typical person nowadays cant change spark plugs on their car even, less are going to believe a person is stealing power off of radio station transmitters.

When was the last time you had poor AM reception and thought, Those dam neighbors must have an energy sucking antenna system they are using to run lights or heat there green house with!
I should call the FCC and have them investigated!

Guess who the community is going to think is a total nutter after that!

I bet its not the neighbors.

__________________
"Issue a general safety warning. Then look the other way and allow stupidity the chance to eliminate itself." -- tcmtech
"Those who can, Will. Those who can't, will achieve positions of power over those who can and then promptly stop them." -- tcmtech
"Your impossibility may just be my day to day routine." -- tcmtech

 

tcmtech just because you don't think it should be illegal or that one can get away (not get caught) with something doesn't make it legal or right. If you're powering a crystal radio then the FCC won't care, if you're powering a greenhouse then you can bet they're going to come knocking. Power companies are on the lookout for dips in the transmission lines too.

__________________
Bill
Smart Kits build Smart People
http://www.blueroomelectronics.com/

 

tcm, you underestimate human nature =) If the story is true, someone owning a greenhouse or metallic structure noticed that beams of a certain length/configuration where getting warm, where others were not, and figured, hell I'll just build em all like that! They can likely claim ignorance, but a judge would say the offending structures would have to be changed to prevent it from interference from occurring.

There are no 'radio cops', but if you want to see how much people are paying attention set up an RF jammer that interferes with cell phone users in a populated area. They will track you down so fast it'll make your head spin =)

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The legality of stuff is not relevant to the physics behind something.
And right or wrong are very relative to each and every person.
What I may think is wrong you may see as perfectly reasonable and justifiable or vice versa.

Saying the speed limit is 65 mph does not actually prevent a person from being able to drive faster than that.
Saying music and video down loading is illegal does not prevent people from doing it. Its how much and how often you do the items motioned above that gets a person caught!

Pulling a few watts off of local radio stations signals is not likely to ever couse a person any legal hassles. Just dont shoot your mouth off about doing it!
Ask the local drug dealers how they get by.
I bet is not from taking out adds in the Sunday paper!
If you got at good thing going STFU and dont ruin it for yourself!

If its a neat little experiment share it on a forum! You can shoot your mouth off all you want about the KW's your pulling down from you least favorite music station!

Post plans, blue prints, spec sheets, and schematics and just go nuts! Those with less moral obligations to the laws they did not vote for or agree to will not have any problem with what you publish!

I posted basic GTI information on this forum and occasionally it still gets the legality of it questioned. But there are far more people that could care less and in fact appreciate the information!

__________________
"Issue a general safety warning. Then look the other way and allow stupidity the chance to eliminate itself." -- tcmtech
"Those who can, Will. Those who can't, will achieve positions of power over those who can and then promptly stop them." -- tcmtech
"Your impossibility may just be my day to day routine." -- tcmtech

 

I so very want a cell phone jammer that is pocket sized!
Just to shut up the idiots that talk on them in places that are not appropriate!

I would bet not one of you have not at least thought that same thing at one time or another!

__________________
"Issue a general safety warning. Then look the other way and allow stupidity the chance to eliminate itself." -- tcmtech
"Those who can, Will. Those who can't, will achieve positions of power over those who can and then promptly stop them." -- tcmtech
"Your impossibility may just be my day to day routine." -- tcmtech

 

The government has them. You could make them. I wouldn't, for the simple fact that if someone near me does something inappropriate with a cell phone it helps me measure them as a person. Even aside from that any such device will effect more legitimate and polite users than it effects the one bad person, the range on a jammer isn't easily controlled.

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Of course we all think about it but most of us understand you just can't go about doing anything you please. Not much you can do about louts and idiots.

__________________
Bill
Smart Kits build Smart People
http://www.blueroomelectronics.com/