Quote:
Originally Posted by AnimateDeath
an EMP that would be powerful enough to take out a vehicle would be massive in size. There is no working "portable" EMP. Electronics is my passion.
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Not true. They have had semi portable models since at least the 80's, if not earlier. Recent models can be built on the cheap that are quite effective. You don't need electronics to build one at all.
http://science.howstuffworks.com/e-bomb3.htm
Quote:
Originally Posted by AnimateDeath
That being said. For an emp to shut down the vehicles computer it would have to be a powerful pulse, in DC, that would confuse the car's computer long enough to think that there was a massive short somewhere. This would trigger the computer to shutdown, but the computer system in a car isn't like a home computer. After a massive ground fault it will turn itsself back on again with no problems. They have no boot cycle and are well protected enough for an electric shock to do no damage to them. You can drive your car down the road, leave it in gear, and shut the key off. The engine will stop running, but turn the key back to the normal run position and it is instantly running again.
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Not at all. EMP is a pulse weapon that generates energy from anywhere from around sub-AM band (100hz-30khz; LF) on up to microwave (3-5ghz) depending upon source. These waves are not direct current at all, they are AC and of quick, rapidly rising, quick decaying but immensely strong power. Consider it like being right next to the antennas on a broadcast TV station, but even more powerful and dangerous, but not RF unless the energy is converted.
Cars have many circuits that use FETs, Transistors, ICs, and many other small and delicate parts for running relays, control systems, and many other critical areas. Feeding high power EMP or even RF into such a device will cause the gate barriers to brake down and freely conduct from gate to collectors or from source to drain. The only devices you can be sure won't brake down (and still can to an extent) are radiation hardened and hermetically sealed devices. IRF carries many of these devices on the mark, all be it some costing as much as a spare computer (which you could do and leave in a ziplock bag, wrapped in aluminum foil.
Quote:
Originally Posted by AnimateDeath
Think of this like you would think of a powerline falling on the car. it is pushing massive amounts of power through the metal but nothing from it can hurt the cars electrical. It is too well grounded within itsself (not to the earth), and DC power is way different than AC in terms of power disruption.
For an electrical blast to stop a vehicle it would have to make direct contact with the engine block (which is a vehicles main ground) and put out enough juice to fry ignition components (i.e. plug wires, powerpack, coil, etc.) but that would take a major amount of power, and would still be virtually inneffective against any vehicles electrical design.
edit: I know they show this happening in movies and there is plenty of talk about it happening, but it is simply something that does not exist right now. Maybe in a few years the technology would come that could make such a device, and there is a working EMP that the Navy tested, but this was mounted to the front of a carrier ship and was a large as a small house. The area of effect from this monster EMP was only like 50yards, and in that yard radius, there was a measured response from testing equipment, but nothing that could stop the electronic systems from functioning.
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If you truly believe it's DC, then let me point out the fact that if it was it would be akin to the Earth's pre-existing magnetic field and of no harm except to navigation, and this just isn't the case. The waves are unlike AC from powerlines too. The frequency is much higher, and since LF doesn't act like low-frequency AC (<10khz) they can jump through holes in the vehicles shell or up and through holes near the engine mounts.
Links:
http://www.heritage.org/Research/Mis...bg1372map1.gif
http://www.strategypage.com/qnd/urba.../20010524.aspx
Let me note that while the vehicles shell, while metal, will protect the car to some extent, its not because it's like lightning. The shell acts like a deflector/reflector more akin to antennas. This effect is greatly used in satelite dish's, due to the parabolic shape, to focus the energy
twords the real antenna. In otherwords, the exterior is bouncing off the energy much like it would a bullet. This is the sole reason it's hard to get signals in fringe zones with cellular while inside your car.
I also have quoted data from my teachings in Electronic Engineering and Computer Science at college. If you'd like a book that discuses some technical areas of this in regards to the happening inside the components, I'd suggest Cambridge University Presses excellent all around electronic book title "The Art of Electronics" by Paul Horowitz and Winfield Hill.
I'd also suggest taking a look at some of the material on this site in the downloads section. It's very enlightening. Also search for studies on the military's testing.
As for securing your vehicle, I'd suggest covering up areas lacking coverage , with holes over 2-4 inches of most concern. If it's not metal body, it may have trouble on SHTF day. A manual transmission may help to be able to start the car, but I'd watch for systems failing such as pressures readings, temperature sensors, fuel controls, air/mixture controls, etc. If it's metal it's most likely fine the way it is.