Survivalist Forum

Advertise Here

Go Back   Survivalist Forum > Survival & Preparedness Forum > Nuclear, Biological and Chemical (NBC) Survival
Articles Chat Room Classifieds Donations Gallery Groups Links Store Survival Files



Advertise Here
Reply
 
Thread Tools Display Modes
Old 05-23-2012, 08:32 PM
Arsenul Arsenul is offline
Hunter
 
Join Date: Jan 2011
Location: Lansing, MI
Posts: 1,542
Thanks: 122
Thanked 831 Times in 444 Posts
Default Cheapest Faraday Cage



Advertise Here

A good 31 gallon space of room for you to place electronics. Rather cheap for $25.00.

http://www.homedepot.com/h_d1/N-25ec...&storeId=10051

The Following User Says Thank You to Arsenul For This Useful Post:
Old 05-23-2012, 11:02 PM
BobMacnamara's Avatar
BobMacnamara BobMacnamara is offline
Crazy Old Man
 
Join Date: Jun 2010
Location: East Coast
Posts: 3,938
Thanks: 8,518
Thanked 6,784 Times in 2,381 Posts
Default

I'm just waiting to see youtube videos where boneheads will start placing plugged in electronics or electronics dependent upon cellular and other radio networks inside.
The Following User Says Thank You to BobMacnamara For This Useful Post:
Old 05-27-2012, 08:14 PM
strvger strvger is offline
Survivor
 
Join Date: May 2012
Location: from the north woods to the high desert.
Age: 64
Posts: 3,149
Thanks: 1,207
Thanked 1,959 Times in 1,213 Posts
Default

nice idea. i have to go smaller for my bov. all steel tool box should do it for me.
Old 11-21-2012, 12:00 PM
Slashace2003's Avatar
Slashace2003 Slashace2003 is offline
Darkness is coming
 
Join Date: Nov 2012
Location: Iowa
Posts: 19
Thanks: 51
Thanked 2 Times in 1 Post
Default

Does this really work
Looks to simple to work
Old 11-21-2012, 12:28 PM
Lui Lui is offline
Junior Member
 
Join Date: Nov 2011
Posts: 141
Thanks: 664
Thanked 91 Times in 49 Posts
Default

To be effective, a Faraday cage must be made of very good conducting metal. Typically copper or brass is used. Also the way it is built is critical. The ones I have worked in (radio technician) were made of brass screening material. Looked very much like a window bug screen. There were 2 layers of it and the 2x4 structure was covered in solid brass sheets. The sliding door also had the brass screening, double layers, and both the top and bottom of the door was recessed about 4 inches into the structure, again to avoid any direct path for RF energy to enter/leave. By their nature, Faraday cages prevent energy from entering or leaving, and the physical design ensures they protect over a very wide spectrum of frequencies and can handle high power as well. If using a solid sheet of steel/iron/sheet metal, it lacks the conductivity of the better material and thus its resistance to both high power and broad frequencies is seriously compromised. Using a microwave oven as a Faraday cage is also most likely not to be an effective option. Microwave ovens are designed to reduce (significantly) a very narrow range of frequencies, namely in the low microwave region of the spectrum (1 to perhaps 5 Giga Hertz). So its spectrum coverage is too narrow to effectively block an nuclear bomb induced EMP. That kind of EMP is very wide spectrum in nature and massively powerful. All this depends on the yield of the nuclear bomb of course, and how far one is from the detonation point. Perhaps, for those on the very fringe of an EMP coverage could get away with the design show above, but I personally would not bother with it, and go with aluminum screening to emulate the Faraday cages I have worked in. Hope this provides some insight into EMP protection. Take care and keep experimenting. Lui
The Following User Says Thank You to Lui For This Useful Post:
Old 11-21-2012, 12:54 PM
Sketco Sketco is offline
Trapper
 
Join Date: May 2012
Location: Wales, UK
Posts: 755
Thanks: 887
Thanked 841 Times in 407 Posts
Default

Quote:
Originally Posted by Arsenul View Post
A good 31 gallon space of room for you to place electronics. Rather cheap for $25.00.

http://www.homedepot.com/h_d1/N-25ec...&storeId=10051

http://www.youtube.com/watch?v=EoQZY1FtI3c


Read the information on bonding and shielding Here:

http://www.survivalistboards.com/sho...62#post4714762

Then you tell me if you still think the video is a good idea
The Following User Says Thank You to Sketco For This Useful Post:
Old 11-21-2012, 12:56 PM
bobsmith bobsmith is offline
I love this forum
 
Join Date: Jul 2012
Posts: 5,330
Thanks: 774
Thanked 3,327 Times in 1,921 Posts
Default

Quote:
Originally Posted by Lui View Post
To be effective, a Faraday cage must be made of very good conducting metal. Typically copper or brass is used. Also the way it is built is critical. The ones I have worked in (radio technician) were made of brass screening material. Looked very much like a window bug screen. There were 2 layers of it and the 2x4 structure was covered in solid brass sheets. The sliding door also had the brass screening, double layers, and both the top and bottom of the door was recessed about 4 inches into the structure, again to avoid any direct path for RF energy to enter/leave. By their nature, Faraday cages prevent energy from entering or leaving, and the physical design ensures they protect over a very wide spectrum of frequencies and can handle high power as well. If using a solid sheet of steel/iron/sheet metal, it lacks the conductivity of the better material and thus its resistance to both high power and broad frequencies is seriously compromised. Using a microwave oven as a Faraday cage is also most likely not to be an effective option. Microwave ovens are designed to reduce (significantly) a very narrow range of frequencies, namely in the low microwave region of the spectrum (1 to perhaps 5 Giga Hertz). So its spectrum coverage is too narrow to effectively block an nuclear bomb induced EMP. That kind of EMP is very wide spectrum in nature and massively powerful. All this depends on the yield of the nuclear bomb of course, and how far one is from the detonation point. Perhaps, for those on the very fringe of an EMP coverage could get away with the design show above, but I personally would not bother with it, and go with aluminum screening to emulate the Faraday cages I have worked in. Hope this provides some insight into EMP protection. Take care and keep experimenting. Lui
there is no such thing as a faraday cage (microwave oven cavity) designed to protect from a narrow spectrum os RF frequencies, unless there are filters in the cavity wal specifically designed to allow lower frequencies in.

any faraday cage will essentially work from it's top cut off frequency (determined by the largest diameter hole, and the depth of said hole, in the wall of the cavity - al lthe way down to DC. now this cavity may have different attenuation at different frequencies, but it will work across that entire spectrum.

people who put a call into a microwave or other faraday cage a s a test are using an unreasonably high standard. a cell phone in the us runs at at least 900 mhz, if not 2 gig plus. with an emp MOST of the power is at 30 mhz and lower. furthermore cell phones are INCREDIBLY sensitive receivers. they can pick up -100 dbm signals. to put that into perspective, the light of a bright star falling on one square meter of the earths surface is about -60 dbm - thats a factor of 1000 times more signal than a cell phone can find!
Reply

Bookmarks



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Faraday Cage for Car? ryan112ryan Nuclear, Biological and Chemical (NBC) Survival 41 06-13-2014 05:47 PM
a faraday cage against emp bikerdruid Disaster Preparedness General Discussion 14 02-13-2014 12:47 AM
Faraday cage hdman Nuclear, Biological and Chemical (NBC) Survival 6 05-02-2012 08:25 PM
Faraday cage Lascivious1 Disaster Preparedness General Discussion 54 04-18-2012 04:47 PM
Faraday cage Cyric Disaster Preparedness General Discussion 29 02-24-2009 08:55 PM


All times are GMT -5. The time now is 06:59 AM.


Powered by vBulletin®
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Kevin Felts 2006 - 2012,
Green theme by http://www.themesbydesign.net