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Faraday cages

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(@anonymous)
Illustrious Member
Joined: 15 years ago
Posts: 11254
 

Large cookie tins work great also.



   
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ranger2012
(@ranger2012)
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Joined: 14 years ago
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Found some 16"L (40cm) x 8" W x8" H metal stacking/pigoen hole boxes (handle at one end only) at a dollars store, just burnished metal, no paint, great for a faraday cage. I have always liked using metal containers, mainly to keep rodents and pests out of my flour and cereals. My wife think I have an obsession with them, and wont bring a tin near me incase I want to keep it. I have, at the most 10 tins which isn’t much. 🙄


"We 'Prep.' to live after a downfall, Not just to survive."


   
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PrepHer
(@prepher)
Prominent Member
Joined: 14 years ago
Posts: 847
 

Would an old fridge or even a freezer work as a Faraday Cage? They are all metal except the rubber seal which is actually a metal magnet covered with the rubber....... anyone? Just wondering....



   
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ranger2012
(@ranger2012)
Noble Member
Joined: 14 years ago
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An old stove might work, mainly because they usually have a mesh seal around the door. If not, then make your own with a lot of steel wool. It would be easier to go to Home Depot, or sheet metal place and get preformed box vents and make your own. You can even buy the cap ends and make a door. OR go to a demolition site and pick some up for free.


"We 'Prep.' to live after a downfall, Not just to survive."


   
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(@j1234)
Eminent Member
Joined: 14 years ago
Posts: 28
 

Question. I want a creat a faraday box for my emergency radio. Would an old metal tool box work?



   
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(@anonymous)
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Joined: 15 years ago
Posts: 11254
 

Question. I want a creat a faraday box for my emergency radio. Would an old metal tool box work?

Yes. If you cleaned the edge of the lid and the top of the box down to bare metal so that there is a continuous contact.



   
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(@j1234)
Eminent Member
Joined: 14 years ago
Posts: 28
 

Do you mean remove all the paint so it is metal



   
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(@anonymous)
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Joined: 15 years ago
Posts: 11254
 

Yes but just where the lid meets the box. The inside edge of the lid and the outside edge of the box, assuming the lid closes over the box.



   
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(@j1234)
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Joined: 14 years ago
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Thank you for your help



   
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(@anonymous)
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Joined: 15 years ago
Posts: 11254
 

That's why we are here.



   
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(@entropy)
Reputable Member
Joined: 14 years ago
Posts: 346
 

Faraday cages for protecting sensitive electronics. An old microwave oven with the guts removed can be used and the cabinet used for storage. They are designed to keep microwaves in but it also keeps stray EMP’s out. If you do not have time wrap the electronics in aluminum foil.

microwaves will not work. they do not have a continuous melt seal, they have gaps around there door.
the idea that they work "because they keep mircowaves in" and "your eye balls would cook if they didn't block the radiation" is silly. microwaves move in a straight line. . .and "The principle danger of microwaves is that body tissue can be affected in the same way that food is. Microwaves can cause burns, eye cataracts and other injuries. It, however, would take high levels of microwaves for this to happen. The levels of microwave radiation in kitchen appliances are fortunately very low. "
http://www.wisegeek.com/what-is-microwave-radiation.htm

a good test is to put a cell phone inside and call it. if the radio waves get thru, and EMP will too.

ammo cans only work if you remove the rubber gasket, take off the paint, replace the gasket with something conductive. . .
of course anything inside needs insulated against touching any metal part inside.

putting duct work tape over it (with the shiny melt side on it) DOES NOT WORK. the top is conductive, the glue side is not. take a multi meter and try to get a short on the glue side.


adsum. . . aut viam inveniam aut faciam


   
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(@entropy)
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Joined: 14 years ago
Posts: 346
 

3M® Copper Conducting Tapes. The tape AND the adhesive are conducting. The electrical resistance through adhesive: 0.005 ohm. Alternately JVCC CFL-5CA Copper Foil Tape (Conductive Adhesive): 1/4 in. x 36 yds. (Copper) is available from Amazon for unver $18.

very good to know. . .


adsum. . . aut viam inveniam aut faciam


   
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(@anonymous)
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Joined: 15 years ago
Posts: 11254
 

Entropy is a great idea "a good test is to put a cell phone inside and call it. if the radio waves get thru, and EMP will too". I tried it with my microwave and the phone did not work. Now that could be because we don't have the strongest signal in this part of the world. Anyway microwave ovens are so bulky, with little room inside, I could never figure out why anyone would want to use one in the first place.



   
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(@entropy)
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Joined: 14 years ago
Posts: 346
 

Entropy is a great idea "a good test is to put a cell phone inside and call it. if the radio waves get thru, and EMP will too". I tried it with my microwave and the phone did not work. Now that could be because we don't have the strongest signal in this part of the world. Anyway microwave ovens are so bulky, with little room inside, I could never figure out why anyone would want to use one in the first place.

i HAD never tried this, until i thought about posting it. if i'm going to claim it, i wanted to test it. and my phone rang inside the microwave last night.

the people that i trust who have done all the work with this stuff came up with this test (at least they introduced me to it), and they have a few others (using a spark plug to sent the current thru the Faraday cage) now if you're thinking i saw that on doomsday preppers, i can promise you my buddy was doing this 2-3 years before that show was even a dream.

i'm not sure one of those Faraday cages on that show would work, there were mistakes with each of them.


adsum. . . aut viam inveniam aut faciam


   
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(@anonymous)
Illustrious Member
Joined: 15 years ago
Posts: 11254
 

I must have missed that episode as I haven't seen any cages on Doomsday Preppers. I have them all saved so I'll go through them again and see if I can find that one. The cage must keep electromagnetic radiation out. The way that it works is that when placed in a field one side becomes positive and the other negative with a null field and no charge on the inside. Faraday cages do not need to be grounded unless you are operating equipment inside them that requires an external source. Not quite sure what the sparkplug test was for.



   
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