EMP-shield for small devices

[MNwr786]

I used to destroy calculators and alarm clocks with nothing more than 4 turns of 14awg wire and a standard million volt stun gun. Simply arcing the stun gun to the coil with the coil in close proximity to the device is all it takes.. However, that will be nowhere near strong enough to work through any metal enclosure or more than an inch or two through the air ~ its gotta be really close.

 

[MNwr786]

You could build something with a range of a few feet if you can find one of those really big electrolytic capacitors (like used for power cable thumping) and charge it up to a few hundred volts. Problem is, if you screw up and touch it, you will end up dead.

 

[rolnor]

I have a 10kW neon transformer, that could be usefull? Can I mesasure HF with this kind of meter? Nissei DG-503 Digital SWR & Watt Meter 1.6-60MHz/125-525MHz Radio Power Tester | eBay

yeah, if you short-circuit that type of capacitor, it will make some noice i think…

 

[rolnor]

I see now that the curcuit for this EMP device is similar to a Tesla-coil, i guess the low-voltage coil in a Tesla coil is actually a EMP-antenna snd the high-voltage-coil is s receiver?

 

[rolnor]

In this report they claim that small devices are not affected by the E3 part if a HEMP, the E3 only affects the grid. What do you guys think of this? I also just discussed this with the military here in my country and they give the same answer. High Altitude Electromagnetic Pulse (HEMP) and High Power Microwave (HPM) Devices: Threat Assessments

 

[lonewolf]

whats the point in shielding small devices if the HEMP affects the grid which most need either for direct power or for recharging?

 

[DrHenley]

In this report they claim that small devices are not affected by the E3 part if a HEMP, the E3 only affects the grid. What do you guys think of this? I also just discussed this with the military here in my country and they give the same answer. High Altitude Electromagnetic Pulse (HEMP) and High Power Microwave (HPM) Devices: Threat Assessments

E3 is very long wavelength, greater than 300 meters. Antennae need to be very long, like power lines or pipelines. Devices (of any size) don't have a long enough wire in them to act as an antenna for the E3 component, so the only way they can be affected is by being connected to a power line or in electrical contact to some pipeline like a water or gas pipeline. For example if you have a ground wire connected to a water line, or have a gas line coming into an appliance.

 

[rolnor]

whats the point in shielding small devices if the HEMP affects the grid which most need either for direct power or for recharging?

You can have a private generator.

 

[rolnor]

E3 is very long wavelength, greater than 300 meters. Antennae need to be very long, like power lines or pipelines. Devices (of any size) don't have a long enough wire in them to act as an antenna for the E3 component, so the only way they can be affected is by being connected to a power line or in electrical contact to some pipeline like a water or gas pipeline. For example if you have a ground wire connected to a water line, or have a gas line coming into an appliance.

Great. There seems to be some arguments that HEMP knocks out everything but I am getting more sure now that its only things connected to the grid. That is very important, cars will be fine for example.

 

[campandtravel]

I have seen this type of arguments before. I would need a good source to be convinced, it does not seem to be correct if I apply my cnowkedge in physics. But I am open for the possubility.

For ****'s sake people. Put your phone inside the thing and call yourself. If it goes to voicemail maybe you're good. If it rings you aren't. Or put a portable radio in there and see if it gets a signal.

If you're good then make sure you have a good plastic lining on the inside of the thing. If any part of your device is touching the metal faraday cage, then electricity will conduct straight through the cage to your device and you'll have no protection.

If you do all of that, then maybe you're going to be okay. But there's no way to know because there's never been an EMP like you're planning for and even if there had been you wouldn't really be able to predict the next one's intensity or what effect it will actually have on any particular device because there is no real data, and electronics have changed more quickly than the few studies.

 

[Proud Prepper]

1. Set the radio to a powerful FM station and turn up the volume.
2. Put it in the Faraday cage and listen to see if the radio station is still audible. If it doesn’t work, don’t get too hyped; FM signals are rather easy to shield against.
3. Set the AM mode to “on.” Next, retest by tuning to a strong AM radio station. The low frequency of AM waves is particularly effective at passing through objects.