Re: [DMCForum] Re: Lo-jack
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [DMCForum] Re: Lo-jack



I don't remember all the details, but a faraday cage needs to have the
proper size mesh to block a frequency.  Just cause a data cable labeled
shielded doesn't mean it is good for all frequencies. Our DC Servo's have
different shielding than the AC servo's or a standard PC data cable.


Andrei



----- Original Message -----
From: "Jim Strickland" <ihaveanaccount@xxxxxxxx>
To: <DMCForum@xxxxxxxxxxxxxxx>
Sent: Thursday, January 22, 2004 6:23 PM
Subject: 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




Yahoo! Groups Links



Home Back to the Home of PROJECT VIXEN


Copyright 2006 ProjectVixen.com.  All rights reserved.

Opinions expressed in posts reflect the views of their respective authors.
DMCForum Mailing List Archive  DMCNews Mailing List Archive  DMC-UK Mailing List Archive