Letter: Faraday Cage Question

Good afternoon!

I have a question on adapting a homemade Faraday cage. I am getting a little paranoid about these two North Korean satellites in orbit over our country.

Would a metal mailbox, such as can find at the local hardware store, be acceptable protection? I am trying to put together something simple for really, really cheap! It has a larger size and is easier to obtain. It is also cheaper than some of the other options I have been reading about on constructing a Faraday cage.  T.B.

HJL’s Comment:

Most any metal container will work as a Faraday cage with a few simple preparations. The metal needs to have a good electrical connection between the various parts. If you are using painted metal, you will have to remove the paint where the electrical connection needs to exist. Galvanized metal works really well. If a metal mail box is not large enough, you can consider a 30 gal trash can with a metal lid….




Letter: Advice for Disabled Suburban Retiree Preppers

HJL and JWR, I’m seeking links or tips on how a 77-year-old disabled person can defend his property in case there’s TEOTWAWKI. My wife is 72. We live in a middle class subdivision 45 miles from Cleveland, Ohio. Because of physical disabilities (neuropathy, bad knees and legs) I am not very mobile. I use walker/cane most of the time. We are moderately prepared (food, guns, ammo, junk silver, etc. A retired Marine lives at the other end of the block but says he will bug out if SHTF. Nobody else on the block seems even to be aware of the …




Letter: Using Military Ammo Cans for Faraday Shielding

Dear JWR: The use of military surplus ammo boxes as Faraday shields was recently mentioned again in SurvivalBlog.  But readers should be reminded that these cans will not work in the configuration where they are normally purchased.  This is because the boxes have a rubber gasket to seal the lid from water and that makes the lid not in [electrical] contact with the body of the can, thereby losing the [EMP] shield effect.  Regards, – Dave X. JWR Replies:  You are correct.  As mentioned previously in SurvivalBlog, the best approach is to remove the rubber gasket,  rough up the metal …




Letter Re: EMP Telltale

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Letter Re: Using EMP-Hardened HF Ham Radio

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Using EMP-Hardened HF Ham Radio to Send/Receive E-Mail During Nationwide Outage- Part 1, by PrepperDoc

There are multiple possible scenarios that may result in a regional an/or national combined loss of Internet connectivity and cell/telephone service, during which you would probably wish to maintain communications to loved ones and others. EMP may destroy routers, cell towers, and power sources; solar coronal mass ejection (CME) may remove power from all communications systems; cyber warfare may have similar outcomes. Travel in some of these circumstances will be difficult, or dangerous to impossible. Ham radio VHF/UHF repeaters may go down, due to power outages or EMP. Direct, point to point simplex VHF Ham radio will still work (even …




Letter Re: Shielding Electronics From EMP

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Two Letters Re: EMP Effect and Pacemakers

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Letter: EMP Effect and Pacemakers

Hugh, I have an implanted cardiac device (a pacemaker and defibrillator) and, after reading the letter about possible effects of electromagnetic pulse (EMP) on batteries, became curious as to how an EMP or maybe a strong solar flare could affect my device. I searched SurvivalBlog’s archives and saw that such an event could possibly damage the implanted cardiadefibrillator (ICD). Is there any firm evidence as to what may actually happen to an ICD or similar device in the human body and anything that can be done to counter the effects? It seems it will be a bleak future for the …




Letter Re: EMP Question

Hugh, I’ve asked Matt Bracken this question, and he didn’t know. I’ve read all of your EMP-related data, but none of them answer the question of whether batteries, particularly the small D, C, AAA, AA types need to be shielded to protect them from EMP. All authors make much of electronics in devices but never mention separate stores of batteries or the dangers of batteries stored in electronic devices like radios, sights, et cetera. Your advice would be greatly appreciated. – S.D. Hugh Responds: There is much FUD in the online world (and in books) about EMP. Some of it …




Two Letters Re: The OTHER Electrical Grid Failure Problem

HJL, I just retired from 24 years of bouncing around the nuclear plants in the U.S. and abroad. For work planning, fire stop penetrations, and OSHA worker safety, every nuclear plant in the world has at least 20 electricians on-site 7/24. During a refueling outage, add 100 to that number. – K.G. o o o Hello Hugh, I read the comments about electricians at nuclear plants and the inability to have more than one or two there in an emergency situation. While I am not disputing that possibility, the entire situation should be told. Electricians are support staff at any …




Letter Re: The OTHER Electrical Grid Failure Problem

Hugh, Four hundred forty nuclear reactors are operating worldwide, representing about 14 percent of global electricity generation. Sixty power plants are under construction, and many older plants slated to be decommissioned may be given new operating licenses. Which country has the greatest number of nuclear reactors (want to guess)? We do; in the U.S. there are approximately 100 plants currently operating. Now imagine a map of the United States, taking a ruler and drawing a straight line from the northern border with Canada, which would head south through the edge of Minnesota, continue through the very edge of western Iowa. …




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