Do you have or have made a faraday cage? | |
Anonymous Coward User ID: 46054152 United States 11/10/2013 07:34 AM Report Abusive Post Report Copyright Violation | 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 User ID: 48692981 United Kingdom 11/10/2013 07:36 AM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 49738866 United States 11/10/2013 07:38 AM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 46054152 United States 11/10/2013 07:40 AM Report Abusive Post Report Copyright Violation | There seems to be some debate as to whether F-cages should be grounded or not. Anyone got the definitive skinny? Quoting: Anonymous Coward 48692981 I would think they should be. 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
User ID: 19876247 United States 11/10/2013 07:45 AM Report Abusive Post Report Copyright Violation | [link to www.youtube.com] "What are you helping with all this helping?" Buddhist saying |
beeches
User ID: 28167778 United States 11/10/2013 07:45 AM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 48692981 United Kingdom 11/10/2013 07:53 AM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 48960271 United Kingdom 11/10/2013 07:53 AM Report Abusive Post Report Copyright Violation | 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 User ID: 49498576 United States 11/10/2013 07:57 AM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 16289425 United States 11/10/2013 07:57 AM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 48960271 United Kingdom 11/10/2013 07:58 AM Report Abusive Post Report Copyright Violation | 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 . Quoting: Anonymous Coward 48960271 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 . And here's how, [link to youtu.be] |
Anonymous Coward User ID: 8468023 United States 11/10/2013 08:11 AM Report Abusive Post Report Copyright Violation | Tell us about it. Any good ideas out there? Help others with your information, thanks. 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 User ID: 8468023 United States 11/10/2013 08:17 AM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 8468023 United States 11/10/2013 08:23 AM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 49327851 United States 11/10/2013 08:33 AM Report Abusive Post Report Copyright Violation | |
Life and Love
User ID: 46807867 United States 11/10/2013 08:33 AM Report Abusive Post Report Copyright Violation | 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 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 User ID: 40778334 United States 11/10/2013 08:33 AM Report Abusive Post Report Copyright Violation | 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
User ID: 46807867 United States 11/10/2013 08:34 AM Report Abusive Post Report Copyright Violation | 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 Quoting: Anonymous Coward 8468023 Anyone know why? 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 User ID: 49644117 Canada 11/10/2013 08:37 AM Report Abusive Post Report Copyright Violation | 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 User ID: 8468023 United States 11/10/2013 08:43 AM Report Abusive Post Report Copyright Violation | 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 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. 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 United States 11/10/2013 08:44 AM Report Abusive Post Report Copyright Violation | 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 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. 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. Why, it's a positive thing that I can so easily amuse you! We become like that to which we are devoted. - Choose wisely. |
Anonymous Coward User ID: 44372991 United States 11/10/2013 08:45 AM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 8468023 United States 11/10/2013 08:53 AM Report Abusive Post Report Copyright Violation | ... Quoting: Anonymous Coward 8468023 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 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. 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. Why, it's a positive thing that I can so easily amuse you! 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>
User ID: 49512476 United States 11/10/2013 08:57 AM Report Abusive Post Report Copyright Violation | |
sandpiper
(OP) User ID: 46265500 Puerto Rico 11/10/2013 09:33 AM Report Abusive Post Report Copyright Violation | 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
User ID: 1461638 United States 11/10/2013 09:39 AM Report Abusive Post Report Copyright Violation | 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 User ID: 28755008 United States 11/10/2013 09:40 AM Report Abusive Post Report Copyright Violation | |
John Becker User ID: 47376723 United States 11/10/2013 09:42 AM Report Abusive Post Report Copyright Violation | |