This may well be the best Faraday cage you can make on the cheap and the best Faraday cage at any price. What you need to place in your Faraday cage is a diesel generator so that, when that EMP goes off, you can sell electricity at whatever price you set.
Surely there will be marauding bands of teenagers and sports fans who will come and take your radio from you! If your home is already grounded, as it should be per building codes, you can ground your cabinet to it. Would being underground, say in a cave, bunker, or fallout shelter protect one’s electronic gear or electrical conductors?
Now anyone thinking that prepping is foolish ask you what’s easier telling your children and loved ones why you prepared or explaining to them why you didn’t? But if any provide not for his own, and especially for those of his own house, he has denied the faith, and is worse than an unbeliever. You could actually simulate an EMP level pulse by charging a bank of high voltage capacitors and discharging them across a narrow gap. In the event something does happen, won’t those you need to communicate with and through need one also? The main thing for nuclear EMP is not to have connections to any power lines or antenna lines- any copper connections at all. So a chain link fence will protect you maybe from 1000 Hz or so, so the shielded room in the pic is a fantasy. If you were to discover a way to shield against a magnetic field you could use that tech to quickly create a magnetic perpetual motion machine. Gravity based perpetual motion machines are also impossible because there is no such thing as a gravity shield.
An interesting fact related to all this that is unknown to the non EE types is how an RF choke works.
Not at the very low frequencies, low magnitudes involved in your described test scenario - the low-level magnetic pulse will blow through the shielding because there isn’t enough magnetization energy. To be sure, you’d need multiple tests and many frequencies that could measure across an up to 80dB dynamic range. This would create a broad-spectrum pulse with frequency content up to the inverse of the pulse-length.
At low frequencies magnetic fields dominate, at higher frequencies electric fields dominate.

The most energetic part of an EMP does not have low frequency components - though the later stage EMP DOES have a geomagnetic component - but it is not highly energetic - so you need a very large collector for it to impact (e.g. Then I would use a radio test multiple frequencies on the FM, AM and SW band and then use a couple of cellphones to the GSM and UMTS bands.
You may think you have a good Faraday cage using receivers but you could fall well short of performance because the signals weren’t strong enough to show your true performance under EMP conditions.
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The size of the holes in the microwave door are designed to block specific wave lengths as Crash said. I've posted this pic a couple of times because it does a great job of showing how one works. You certainly can ground it but remember that current flow is from an area of greater potential to an area of lesser potential.
Your browser has JavaScript turned off.You will experience a more enjoyable time at this Web site if you turn JavaScript on. Me I don’t want to be beholden to anyone for providing what is needed for me and mine. A professor in EE told me about his brother having a contract to create the equivalent to a Faraday cage for Magnetic fields from the Navy. A hole in a Farday cage lets in EM radiation, but the size of the hole determines the frequency. It’s made of screening, yet is a very good reflector at the freqs the astronomers use.
You say even mu-metal wouldn't work, but RFEngineer says even steel is good enough to work. For instance, if you are under 200ft of granite, you will not get significant shielding effect, because granite (or dry sand) is very low conductivity and hence, does not significantly dissipate an EMP. The best inexpensive ad-hoc shield I can think of is the trash can - but use steel wool fragments around the full circumference of the lip and hammer it down solid with a rubber mallet.
You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. You are preventing the discharge from traveling through whatever you are trying to protect which any metallic box will do. Just line a whole room or the garage with aluminim foil and everything in it, including the car, will be protected?

If you are at all concerned about protecting your electronic equipment from either a man made or solar EMP please consider making a Faraday storage cabinet like this.
The brother set up an experiment where he created a Mu-metal cage around a detector on the theory that the cage would route the field around the detector.
A pinhole in a weld will let in only, say, 90 GHz and up while being completely opaque to lower freqs. For instance: If you connect an RF choke across a transmitters antenna feed line it will not hinder the flow of RF in the line. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Here is an experiment that you can do with your mobile phone - Learn how to make a simple Faraday's cage and block the signal reception from your mobile phone! It will however create a low resistance path for dc energy to flow between the feedline conductors. All you are trying to do is have a discharge travel over the outside of the Faraday cage instead of inside it. You might be able to make this Faraday cage for less if you stop by construction sites and get left over aluminum insulation and ask for thirteen feet of aluminum duct tape.
A smaller and weaker version of this idea is used to pass huge current pulses through a small 6 turn open air coil that produces such a large magnetic pulse that it can penetrate the skull and induce small currents in the brain. If your transmitter is grounded then the choke across the transmission line means your entire antenna system is directly connected to the ground because the braid of the transmission line is connected to ground. A high-current pulse with a very short pulse-length is bound to produce a very high magnetic field. If you have any problems with the registration process or your account login, please post in the first "Registration Help" subforum.
Think of folks inside an airplane when it is hit by lightening and you have a Faraday cage. This lets static bleed away to the earth and still the antenna functions normally.The lower the RF frequency the larger the choke needs to be to block it.

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