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In reply to the discussion: Hey tinfoil hatters, we'll never see armed drones used in America. NEVER!!! [View all]2on2u
(1,843 posts)Morpheus would approve.
http://answers.yahoo.com/question/index?qid=20100519144202AAnDz8Y
You will have to design your own, because no plans are available on the internet. You need a high voltage capacitor, a spark gap, and an antenna. Charge the cap up to a few kV, then discharge it into the antenna via a spark gap. The antenna should have a zero resistance to DC, I would suggest a folded dipole. The cap should store about 1 kilojoule for the range you are talking about. You can find them surplus, or Maxwell labs make them.
You need a 12V powered high voltage supply to charge it. These are readily available on ebay, or Vicor make them.
If it works, why not publish detailed plans on the internet for the next guy to use?
The spark gap you can probably make yourself. They are commercially available, known as cold cathode thyrotrons or Kytrons.
These kind of parts are dangerous and expensive, and there may be some operating permit issues for the completed device.
P.S. The source purports to sell complete plans ready to go, but I would be very leery about whether they actaully work. Caveat emptor!
Source(s):
http://www.surplussales.com/Capacitors/M
http://www.amazing1.com/emp.htm