Has this thread ever looked into the possibility of an EMP causing radios to be useless, and/or radios that are resistant to or can be repaired for use after an EMP? It's a serious concern if things get all nukey.
The EMP thing is overrated as to it's scope and effect. If you are affected to the point where your gear is fried, then you have much bigger problems than no radio. It means you'd be within the scope of all the other near field effects of a blast: pressure, temperature and other forms of radiation.
Actually not completely correct.... the following is from an article found through the links I postedhttp://www.globalsecurity.org/wmd/libra ... 88/CM2.htm
Electromagnetic Pulse-From Chaos To A Manageable Solution
AUTHOR Major M. CaJohn, USMC
SUBJECT AREA C4
....there are four significant types of EMP.
The first, surface burst electromagnetic pulse (EMP), occurs when the nuclear burst explodes on the earth's surface or up to two kilometers above the surface. The radiated wave is only propagated to a distance of ten to twenty kilometers from the burst point due to the higher density of the lower atmosphere. Although the area over which the low-altitude EMP produces a damaging effect is relatively small, it is significant on the tactical nuclear battlefield (9:1-10-1-11).
The second type, high-altitude EMP (HEMP), is the most significant and, potentially, the most hazardous to our security. The explosion of a nuclear burst at an altitude greater than 30 to over 500 kilometers above the earth's surface will produce the above scenario. Due to the very thin to non existent atmosphere at these altitudes, the gammma rays emitted from the explosion will travel radically outward for long distances. Those gamma rays traveling toward the earth's atmosphere are stopped by collisions with atmospheric molecules at altitudes between 20 and 40 kilometers. These collisions generate Compton recoil electrons which interact with the earth's magnetic field to produce a downward traveling electromagnetic wave. This high altitude burst will not generate any other nuclear effect at the earth's surface (9:1-5).
However, this type of nuclear explosion also produces a vast ground coverage. Significant HEMP levels occur at the earth's surface out to where the line of sight from the burst contacts the earth's surface. Consequently, a nuclear burst over the central part of the United States at an altitude of 500 kilometers would produce an EMP field that would incapacitate all communications systems in the continental United States (9:1-8).
The third type of EMP is source region EMP (SREMP). This is produced by a nuclear burst within several hundred meters of the earth's surface (the fireball touches the ground). SREMP is localized three to five kilometers from the burst. The generation of EMP by a surface blast begins with the gamma rays traveling radically outward from the burst. This action causes the Compton electrons to move radically outward and leaves behind immobile positive ions. This produces an electric field and lasts two to three nano seconds. The final result is a tremendous surge on current in the air on any communications equipment and the SREMP renders the equipment useless (9:1-10-13).
The last type of EMP is system generated EMP (SGEMP). SGEMP results from the interaction of x-rays or gamma rays striking an atom on a metal object. A nuclear blast in outer space sends gamma rays or x-rays out in all directions. If these rays were to strike an unprotected satellite or missile traveling above the atmosphere, these rays would knock out electrons from the atoms of the metal skin. This action would induce an EMP field that would make the satellite and the missiles useless (9:1-17-1-21 & 5:75-76).
Although the EMP effect was known to exist during the detonationtion of conventional explosives prior to the first atomic explosion and was predicted in nuclear weapons' tests, the extent and potentially serious nature of EMP were not realized for several years. Several incidents related to the 1963 detonation of a 1.4 megaton nuclear device 250 miles above Johnston Island highlighted the potential effects of EMP. Immediately following the detonation, the island of Oahu, Hawaii, which was located 800 miles from ground zero, experienced several power outages, the activation of hundreds of burglar alarms and the short-circuiting of thirty strings of streetlights (1).
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