David VanHorn <dvanhorn <at> microbrix.com> writes:

> On 1/11/07, Peter P. <plpeter2006 <at> yahoo.com> wrote:
> >
> >
> > http://news.yahoo.com/s/ap/20070111/ap_on_hi_te/spy_coins
> >
> > I wonder how they get the signal out. Assuming the lids are metal and
> > insulated
> > they could be used as 'dipole' halves. Or use a microwave frequency and
> > resonate
> > the disks as is ?
> 
> The latter.. Look up the "great seal" bug, and that BTW was done by Lev
> Theremin

'Painting' something with microwaves in 2006 will likely end up with half the
country's black helicopters buzzing the source before you can say 'hop'.
Especially some kind of defence-related installation. The kind of beam needed to
illuminate a resonator should be almost the same with the kind of beam used to
illuminate a target before shooting a radar guided missile at it, power-wise.

Outguessing what others did or did not do is not what I was trying to do. I was
trying to understand how one gets a signal out of something that very closely
resembles a good quality shield can. Low power too, as there is no room for a
big battery in there.

I think I saw some boxes like that in a museum kind of place on the web. They
were supposed to be carrying microfilms or codepads or such, during the cold
war. Not transmitters.

Also, having such a thing planted on one, where one would be a scientist with
some form of security clearance, would probably be one of the fastest ways to
end one's carreer as a defence subcontractor, and possibly land one in jail
while the powers that be make their minds up about what the thing got used for.

So, I assume it's really a tracking gadget, as they said, and I would like to
know how one couples the signal to it so it gest out of the box. Resonating the
box directly as a slotless slot antenna or flat discone might work.

Peter P.


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