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Do you have or have made a faraday cage?

 
sandpiper
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11/10/2013 07:24 AM
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Do you have or have made a faraday cage?
Tell us about it. Any good ideas out there? Help others with your information, thanks.hiding
If you break my wings, I will just find a cloud and learn to fly again. The Lord will catch you when you fall or teach you to fly! May the footprints I leave lead you to BELIEVE.
Anonymous Coward
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11/10/2013 07:34 AM
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Re: Do you have or have made a faraday cage?
I use microwave ovens, you have to line the inside of the ovens with cardboard, because you don't want your gadgets to come in contact with the metal-oven.

Although in theory a microwave oven isn't even necessary. People claim that a simple cardboard box wrapped on the outside with tinfoil is all you need.

Or any metal box (6 sides), lined on the inside with cardboard will suffice.
Anonymous Coward
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11/10/2013 07:36 AM
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Re: Do you have or have made a faraday cage?
There seems to be some debate as to whether F-cages should be grounded or not. Anyone got the definitive skinny?

I would think they should be.
Anonymous Coward
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11/10/2013 07:38 AM
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Re: Do you have or have made a faraday cage?
Yes.
Ammo cans.
Anonymous Coward
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11/10/2013 07:40 AM
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Re: Do you have or have made a faraday cage?
There seems to be some debate as to whether F-cages should be grounded or not. Anyone got the definitive skinny?

I would think they should be.
 Quoting: Anonymous Coward 48692981


I have heard it suggested. And refuted. Probably I would ground mine, but it's just not practical in my situation. so mine are not.
Theobromine

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11/10/2013 07:45 AM

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Re: Do you have or have made a faraday cage?
There is one that uses a TRASH can lined inside and in the lid. glue foam sheeting to it with liquid nails super sticky. Looks very easy. Let me know


[link to www.youtube.com]
"What are you helping with all this helping?" Buddhist saying
beeches

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11/10/2013 07:45 AM

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Re: Do you have or have made a faraday cage?
No, I let my faradays run free. Now the hamsters, they have cages.
we only have each other. And that makes us rich.. . .

Wisdom in the man, patience in the wife, brings peace to the house and a happy life.
Anonymous Coward
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11/10/2013 07:53 AM
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Re: Do you have or have made a faraday cage?
No, I let my faradays run free. Now the hamsters, they have cages.
 Quoting: beeches


lol
Anonymous Coward
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11/10/2013 07:53 AM
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Re: Do you have or have made a faraday cage?
F/ages can be made out of any type of metal box or mesh type metal/copper . It is advisable to ground any F/cage , if you live in an apartment you can ground it through you radiator system , making sure you get back to copper, ie with a little wire wool take off the paint and put an earth strap on the copper . Put a liner in the F/cage so any equipment put inside doesn't touch the metal/copper casings, insulating any equipment inside .

To test your F/cage put a portable radio inside with any radio station playing , put your lid on and if you cannot hear the radio you've made your F/cage .
Anonymous Coward
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11/10/2013 07:57 AM
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Re: Do you have or have made a faraday cage?
anyone know if a safe would make a good faraday cage?
Anonymous Coward
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11/10/2013 07:57 AM
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Re: Do you have or have made a faraday cage?
Large, about 8'x3.5'x6' and grounded.
Anonymous Coward
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11/10/2013 07:58 AM
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Re: Do you have or have made a faraday cage?
F/ages can be made out of any type of metal box or mesh type metal/copper . It is advisable to ground any F/cage , if you live in an apartment you can ground it through you radiator system , making sure you get back to copper, ie with a little wire wool take off the paint and put an earth strap on the copper . Put a liner in the F/cage so any equipment put inside doesn't touch the metal/copper casings, insulating any equipment inside .

To test your F/cage put a portable radio inside with any radio station playing , put your lid on and if you cannot hear the radio you've made your F/cage .
 Quoting: Anonymous Coward 48960271

And here's how, [link to youtu.be]
Anonymous Coward
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11/10/2013 08:11 AM
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Re: Do you have or have made a faraday cage?
Tell us about it. Any good ideas out there? Help others with your information, thanks.hiding
 Quoting: sandpiper


This is probably the best and least expensive device you can make
stainless or aluminium beer keg, cut it so you can overlap the edges to make a tight overlapping seal which can also be sealed with foil strip or stuff the overlap with foil packing


you need to seal over the bung hole too.


Any experts care to comment?
Anonymous Coward
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11/10/2013 08:17 AM
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Re: Do you have or have made a faraday cage?
Some so called authorities suggest that the device should not be painted, that paint changes effectiveness for the worse if its not the expensive silver based conductive paint
Anyone know why?
Anonymous Coward
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11/10/2013 08:23 AM
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Re: Do you have or have made a faraday cage?
Large, about 8'x3.5'x6' and grounded.
 Quoting: Anonymous Coward 16289425


The bigger it is the bigger antenna it becomes.


with increased induced charge you need greater mass and conductiveness of the device.
nested cage is probably called for if not made with thick enough copper sheet
Anonymous Coward
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11/10/2013 08:33 AM
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Re: Do you have or have made a faraday cage?
Why we need a faraday cage? for an EMP? xDDD, you nutts no EMP will happen, it's a GLP doom, they are 100% wrong and FAIL ALWAYS.
Life and Love

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11/10/2013 08:33 AM
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Re: Do you have or have made a faraday cage?
Large, about 8'x3.5'x6' and grounded.
 Quoting: Anonymous Coward 16289425


The bigger it is the bigger antenna it becomes.


with increased induced charge you need greater mass and conductiveness of the device.
nested cage is probably called for if not made with thick enough copper sheet
 Quoting: Anonymous Coward 8468023


And unless the FC is sitting on the ground, your grounding wire is a nice, long antenna.

Also, be sure to test the shielding effectiveness across all frequencies. Use an AM radio, FM radio, and cell phone. Many microwave ovens that shield well at higher frequencies suck at the low frequencies of EMP.
We become like that to which we are devoted. - Choose wisely.
Anonymous Coward
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11/10/2013 08:33 AM
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Re: Do you have or have made a faraday cage?
Mt daughter made one as a school experiment. Not so much experiment but she was required to choose and build something that involved electronics.

She first built the external skeleton shell using 3/8" copper tubing. The actual size was 36" long - 16" wide and 10" deep.

After cutting and soldering the exoskeleton together, she proceeded to "wrap and solder" copper mesh to the skeleton.

Once this was completed, she started on the internal boxing, she cut and taped a flexible foiled covered insulation, using metal tape that is used for AC and heating duct work. This entire box was made of the flexible foil back insulation.

Since the metal insulation is always in contact with the copper, it acts as one. Her third internal box was a cardboard box that she lined with 1/16" (2" wide) rubber electrical wrap.

Since each unit had a lid, she built each one using that same materials for that particular box.

She used copper screws for grounding the external lid to the copper mesh skeleton. Using small alligator clips and copper braided wire she made the grounding cable lid to box.

Finally after a lot of trial and error and 30 hours of work building and testing, she proceeded to test it, first using a small AM/FM battery operated radio. Found a strong output, turned volume up 100 percent and placed it in the cardboard box, placed the cardboard box inside the foil backed box and finally placed all inside the copper unit.

The radio signal was lost, still not happy she used cellphones as the next test, from smartphones to a unit that was used for calling only.

Every phone placed within the cage did NOT receive and calls when dialed. When viewing the screen of any phone none even showed it was called.

When presenting her project at school, she used numerous phones that other students provided to prove the unit works. She allowed other students to try, using their phones as test objects and allowed them to try and call. Over 15 tries during her presentation and not one call was received on any phone within the cage.

But it wasn't a subject one takes lightly if grades are involved, 30% of the overall grade. The time involved, the test, the trial and error. The numerous phones calls to individuals that work with possible EMP effects.

When she started to work on this project, she viewed many YouTube videos, read many how to construct by ones that claimed using a trash can will work.

She decided to take a different approach, she wanted a real one constructed from materials that are known to work. Yes I had to purchase the materials, I showed her how to cut copper tubing and solder copper tubing.

From there she took control and built a real working Faraday cage. After completing the cage, she had to write a report, step by step, materials used, total hours, types of testing.

List of professionals she emailed and spoke to with contact info for each. Possible sources of an EMP, severity levels, proven methods. She documented over 100 hours on this project, in turn she received a grade of 100 on both the project and report.

Note: As for grounding, a proper external ground will required depth in footage using the same material as the exoskeleton, but solid not hollow like tubing. And no her Faraday cage was never ground, nor was it required. Only grounding required was the lid to the main body.
Life and Love

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11/10/2013 08:34 AM
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Re: Do you have or have made a faraday cage?
Some so called authorities suggest that the device should not be painted, that paint changes effectiveness for the worse if its not the expensive silver based conductive paint
Anyone know why?
 Quoting: Anonymous Coward 8468023


There are many "so called authorities" out there.

Best to test your FC yourself and let its performance guide you.

As I wrote a moment ago, use an AM radio, FM radio, and cell phone to cover the frequency spectrum.
We become like that to which we are devoted. - Choose wisely.
Anonymous Coward
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11/10/2013 08:37 AM
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Re: Do you have or have made a faraday cage?
I use an old microwave oven but certain mods should be made first before using it as a faraday cage.
First, cut off and remove the electrical cord. The cord could double as an antenna and attract EMP, also best way to insure that the unit is never turned on which would fry any gadgets inside.
Second, take metal tape and cover all the vent holes, both on the outside and inside of the unit for a tight seal.
Third, line the inside of the unit with thick cardboard which serves as good insulation.
Fourth, find an old metal cookie or coffee tin, be sure that the lid is metal as well and that it will fit inside the microwave, and line the tin with cardboard as well.
Place gadgets inside the tin and place the tin inside the unit. This is called 'nesting' and offers up a second level of protection.
This can all be done quickly and inexpensively. Might seem a bit excessive but better to be safe than sorry.
Anonymous Coward
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11/10/2013 08:43 AM
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Re: Do you have or have made a faraday cage?
Large, about 8'x3.5'x6' and grounded.
 Quoting: Anonymous Coward 16289425


The bigger it is the bigger antenna it becomes.


with increased induced charge you need greater mass and conductiveness of the device.
nested cage is probably called for if not made with thick enough copper sheet
 Quoting: Anonymous Coward 8468023


And unless the FC is sitting on the ground, your grounding wire is a nice, long antenna.

Also, be sure to test the shielding effectiveness across all frequencies. Use an AM radio, FM radio, and cell phone. Many microwave ovens that shield well at higher frequencies suck at the low frequencies of EMP.
 Quoting: Life and Love


Its always amusing to see which posts you respond to and which you ignore, for the most part you like to induce a negative charge,
You never respond to anything positively.
Life and Love

User ID: 46807867
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11/10/2013 08:44 AM
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Re: Do you have or have made a faraday cage?
Large, about 8'x3.5'x6' and grounded.
 Quoting: Anonymous Coward 16289425


The bigger it is the bigger antenna it becomes.


with increased induced charge you need greater mass and conductiveness of the device.
nested cage is probably called for if not made with thick enough copper sheet
 Quoting: Anonymous Coward 8468023


And unless the FC is sitting on the ground, your grounding wire is a nice, long antenna.

Also, be sure to test the shielding effectiveness across all frequencies. Use an AM radio, FM radio, and cell phone. Many microwave ovens that shield well at higher frequencies suck at the low frequencies of EMP.
 Quoting: Life and Love


Its always amusing to see which posts you respond to and which you ignore, for the most part you like to induce a negative charge,
You never respond to anything positively.
 Quoting: Anonymous Coward 8468023


Why, it's a positive thing that I can so easily amuse you!

hf
We become like that to which we are devoted. - Choose wisely.
Anonymous Coward
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11/10/2013 08:45 AM
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Re: Do you have or have made a faraday cage?
can't you just use ammo cans as faraday cages? just put them on the concrete basement floor near or touch any metal piping

5a
Anonymous Coward
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11/10/2013 08:53 AM
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Re: Do you have or have made a faraday cage?
...


The bigger it is the bigger antenna it becomes.


with increased induced charge you need greater mass and conductiveness of the device.
nested cage is probably called for if not made with thick enough copper sheet
 Quoting: Anonymous Coward 8468023


And unless the FC is sitting on the ground, your grounding wire is a nice, long antenna.

Also, be sure to test the shielding effectiveness across all frequencies. Use an AM radio, FM radio, and cell phone. Many microwave ovens that shield well at higher frequencies suck at the low frequencies of EMP.
 Quoting: Life and Love


Its always amusing to see which posts you respond to and which you ignore, for the most part you like to induce a negative charge,
You never respond to anything positively.
 Quoting: Anonymous Coward 8468023


Why, it's a positive thing that I can so easily amuse you!

hf
 Quoting: Life and Love


I guess the difference between us is tha that what I learned on the publics dime I share with those that were the ones that actually provided the money, not just the ones that signed the cheque
<x>

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11/10/2013 08:57 AM
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Re: Do you have or have made a faraday cage?
:fardaytard:
sandpiper  (OP)

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11/10/2013 09:33 AM
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Re: Do you have or have made a faraday cage?
Thanks for your replies. A metal trash can with card board inside seems to be a good one. Also the micro wave. Guess no one really knows, but it is worth trying, could save you from losing things you really need. Also, I understand that your solar panels need protection as well. Sorry for the guys that have spent $100,000 of dollars on them on their roofs that really expose them to flares or what ever. Tin foil, I thought was a no no but seems it doubles protection after sealing something in card board and wrapping the box with tin foil and putting it all in your faraday cage. Lets hope we never need them! Keep the info coming.
If you break my wings, I will just find a cloud and learn to fly again. The Lord will catch you when you fall or teach you to fly! May the footprints I leave lead you to BELIEVE.
Resister

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11/10/2013 09:39 AM

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Re: Do you have or have made a faraday cage?
I bought some faraday bags to keep basic communications equipment in until needed. Here is where I got them.

[link to thelibertyman.com]
"God forbid we should ever be 20 years without such a rebellion. The people cannot be all, & always, well informed... If they remain quiet under such misconceptions it is a lethargy, the forerunner of death to the public liberty... Let them take arms... What signify a few lives lost in a century or two? The tree of liberty must be refreshed from time to time with the blood of patriots & tyrants. " - Thomas Jefferson in 1787
Anonymous Coward
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11/10/2013 09:40 AM
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Re: Do you have or have made a faraday cage?
A microwave oven? For a F-cage? Try this:

Place your cell phone inside one and close the door.
Call the phone from another phone.
2 out of 3 times it will still ring.


So much for shielding.
John Becker
User ID: 47376723
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11/10/2013 09:42 AM
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Re: Do you have or have made a faraday cage?
I use a microwave and have backup ECM computer units for both cars in it.





GLP