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Unread 31-03-2008, 14:01
Unsung FIRST Hero
Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 1996
Location: Wheeling, IL
Posts: 10,798
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Re: witricity legality?

Shadow,
(what is your real name?) As posted above, RF communication is an electromagnetic signal. Two coils spaced apart are capable of coupling energy but it is unlikely that interference or body absorption would not occur. This is how transformers actually function. If you think about current in a coil of wire producing a magnetic field similar to a bar magnet you can imagine the field produced by this device. The FCC limits and licenses devices used to transmit energy under part 15...
TITLE 47--TELECOMMUNICATION CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION PART 15--RADIO FREQUENCY DEVICES--Table of Contents Subpart C--Intentional Radiators Sec. 15.209 Radiated emission limits; general requirements.
The table contained there (http://frwebgate.access.gpo.gov/cgi-...00&TYP E=TEXT) does not copy well but essentially it requires that unlicensed operation must be below 30 microvolts/meter at 30 meters from the radiator. Most hams naturally consider that transmitters in the milliwatt range (much less than one watt) satisfy non-licensed devices. In that the experimental device was described as transmitting 150 watts, in general it would have needed to be licensed even if only an experimental one.
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
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Storming the Tower since 1996.

Last edited by Al Skierkiewicz : 31-03-2008 at 14:18.