Re: [DMCForum] Re: Lo-jack
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Re: [DMCForum] Re: Lo-jack



The only thing that I am convinced of is that a "metal shipping
container" does not seal very well.  By definition, no electromagnetic
signals can get inside a "faraday cage", which I thought a metal shipping
container would be very similar to. 

If the shipping container or elevator was a metal box without openings,
it would get no signal inside. 

Andrei is "onto something" about frequency, but only that significantly
increased frequency has a higher propensity for going through
non-metallic matter, and not being absorbed/reflected by it. 

There are other methods we're aware of, such as ULF and ELF for
transmitting underwater, but i think that's irrelavent here.


Jim

On Thu, 22 Jan 2004 15:41:52 -0500 "Dave Stragand"
<dave.stragand@xxxxxxxxxxxxxxx> writes:
> Think "cell phone".  They work 3 stories underground in my parking
> garage,
> and in elevators (metal boxes) and Lo Jack is pretty much the same.
>
> -----Original Message-----
> From: Jim Strickland [mailto:ihaveanaccount@xxxxxxxx]
> Sent: Thursday, January 22, 2004 3:22 PM
> To: DMCForum@xxxxxxxxxxxxxxx
> Subject: Re: [DMCForum] Re: Lo-jack
>
>
> anyone want to try to explain how the signal can go through an
> enclosed
> metal box?
>
>
> >The signal can be received in underground parking garages and metal
> shipping
> > containers.
>
>
>
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