Simple circuit to find lost passport

I'd like to see an independent verification of that.

Sylvia.

Too restrictive of an assumption. One does not have to activate it, give it any code or expect any code to be radiated. Just assume that, at a distance, is a "tuned" energy absorber - makes the solution far easier.

Perhaps.

The devices that are inserted into pets obtain their energy from the varying magnetic field generated by the reader, and return their signal by modulating the power being absorbed.

For a device that is only intended to be read from a short distance, that technology seems the obvious to use, and it would be difficult to read the device from a greater distance.

I can imagine a device that aborbs energy at one frequency, and transmits a signal on a different frequency. It would be easier to power and read such a device from a distance, but why bother making it that way?

Sylvia.

Think antenna size and available power to transmit, thus "reader" transmitting at 130kHz and "tag" transmitting at 1-2GHz are quite common. ...Jim Thompson

Won't do you any good because you'll be dead in seconds. Maybe if you were also missing a Franklin, or two, that you had at the same time...

So do I. A couple of weeks ago I lost my round-the-house glasses. She eventually found them, in the laundry. They're not too badly scratched. :-(

The pet implants are not transmitting. As far as I can see, it's all inductive coupling.

Leaving aside any privacy issues, making a device for a passport that's capable of being read from a distance seems just asking for trouble. Any official system for reading them then risks reading the wrong one.

Sylvia.

They ALSO have to be in close proximity to the reader, which actually powers a bit of things up "in there". So, you cannot merely proximally read the rfid on it.

Work badges are similar. Even though they could read your badge from a greater distance, they require close proximity to inductively power the rfid transmitter and key in the badge. added security, and it keeps doors from opening simply because you walked by.

Once they perfect passive rfid sense capacity such that they can see them from several yards or even a couple tens of yards away, they will be able to actively track multiple assets that are always on the move and returning accurately. That coupled with laser scanned advanced optically coded graphics tags makes expensive assest tracking easier. Also works well with controlled access (secret) hardware well.

=A0 =A0 ...Jim Thompson

The first set is quite the tell about you. The second set is D=E9j=E0 vu. Yet to happen, but will. Not standard at all.

BWuahahahaha!

Read more carefully, I was just explaining dual-frequency... and _I_ design such things, not just talk :-)

I would imagine that Passports employ _passive_ tags that simply absorb power as a data modulation method. ...Jim Thompson

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is

"Someone has stolen my stocks!" from "Trading Places"

=A0 =A0 ...Jim Thompson

Everybody loves you Archie!

You do not understand. The longer the distance, the more likely incorrect data is received - thereby triggering a de-facto Terrorist Alert and an excuse to terrorize anyone standing in line.. ..and charging them guilty without benefit of redress, etc...

While I hold some sympathy for the view that the authorities just want to make our lives miserable, there being abundant empirical evidence of this, I think one has to accept the harsh truth, which is that they're actually doing so as the result of stupidity and incompetence, not by design.

Sylvia.

Bureaucrats have no incentive to make your life easier. Their only allegiance is to their job (their superior) and that can't be taken away. Stupidity and incompetence are just byproducts.

Did you design the ones they use to track people who wander off from 'the short bus'? If so, one of them may be implanted in Dimmie. :)

Maybe a metal detector?

-- Boris

Wouldn't that detect the metal rings in the binders that are in the cabinets?