[ale] Radio-frequency identification (RFID) chips

[James P. Kinney III]

On Sat, 2004-01-10 at 15:39, Mike Panetta wrote:
> Speaking as an amateur radio enthusiast (KG4TTU is my call sign)
> the FCC would frown upon that action greatly.  Microwaving the things
> or sending out a low power short range field might be acceptable, assuming
> it does not interfere with anything outside your yard or house, but obliterating
> all forms of radio for 2 miles is an arrestable offense and I would highly suggest
> not doing it, especially given the current climate of terrorism that we are in.
> 
> 

I would agree entirely!! I made this discover many (many) years ago and
was rewarded for my efforts by a brief and polite visit from the FCC. As
I was only 16 and the use of the coils was not an intentional effort to
jam the RF band (it was a power supply component for an X-ray machine I
was building), I was given a list of references for shielding and a
stern order to not use it again with out shielding. I was happy to
comply. Especially since that process gave me access to another entire
level of equipment to play with as I took my modified system over to the
FCC guys to get their approval before I cranked up the system again. The
RF shielding was good but I could really screw up a tv picture with the
magnetic field from about 40'! 

You are absolutely correct that cranking up this type of equipment now
might result in jail time given the current national mentality on
security.

A much better use would be to wrap the entire mess, except for one end
of the soft iron core in "mu metal". This will both shield the RF and
the attenuate the magnetic field. "mu metal" may be a brand name. It is
an alloy I used in UHV systems to block the earths magnetic field for
sensitive experiments. A layer about 3x the thickness of heavy Al foil
would completely block the 0.5 Gauss field of the Earth. The open end
allows the intense magnetic pulse to escape. A mu metal cone can help as
a directional element. The effect on large bass speakers should be
permanent. This might help silence some cars that have had their back
seats replaced. :)

> Mike
> 
> -----Original Message-----
> From: "James P. Kinney III" <jkinney at localnetsolutions.com>
> Sent: Jan 10, 2004 10:44 AM
> To: bob at verysecurelinux.com, Atlanta Linux Enthusiasts <ale at ale.org>
> Subject: Re: [ale] Radio-frequency identification (RFID) chips
> 
> On Fri, 2004-01-09 at 23:59, Bob Toxen wrote:
> > On Wed, Jan 07, 2004 at 02:39:53PM -0500, Mazukna, Tomas wrote:
> > > It is time to get some of those RFID tags and start playing.
> > > We need a device to fry them :)
> > > Sounds like a great idea ... New gizmo you install in you cars trunk and
> > > it fries rfid tags on your way home from store.
> > I agree that a microwave would be easiest.  My tesla coil will do a fine
> > job but they are non-trivial to buy, steal, or build.  I suspect that
> > a police radar gun will work up to some distance but I think that they
> > go for something like $3000.
> 
> Oudin coil would also likely work. Buy a full spool of #24 enameled wire
> of around 10k' long. Remove as much of the middle of the spool as
> possible to make the hole larger. Put in the largest soft iron core you
> can fit. Flatten a 10' section of 1/4" copper tubing and wrap it around
> the entire spool. Take care that the copper coils do not touch or
> separate with paper. connect the ends of the copper pipe to the 120V
> 60Hz power supply near the circuit breaker. The resulting magnetic field
> will obliterate radio and tv transmissions for about 2 miles.
> 
> Hook that up to a tesla coil for some real fun.
> > 
> > > Tomas
> > Bob
> > _______________________________________________
> > Ale mailing list
> > Ale at ale.org
> > http://www.ale.org/mailman/listinfo/ale
-- 
James P. Kinney III          \Changing the mobile computing world/
CEO & Director of Engineering \          one Linux user         /
Local Net Solutions,LLC        \           at a time.          /
770-493-8244                    \.___________________________./
http://www.localnetsolutions.com

GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7
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