Re: Removal of electronic tags, propaganda, and Serco

On Sun, 28 May 2006 14:03:33 +0100, Stephen Glynn
<nyeplm@xxxxxxxxxxxxx> wrote:


So I gather, but over what sort of range does this work? I know this
is how actually existing RFID devices work in shops and warehouses, but
that's only over a few metres at most.

Ca. 3 metres.

Could you scale it up to work
over a couple of kilometres so that the RFID chip, on being 'woken up',
has sufficient power to say 'Here I am' back to a base station a mile or
so down the road?

No.

The inverse square law would be invoked twice over.

To get the same power to the chip over 2km as compared to 2m would
require 1 million times the power. Unfortunately the chip would also
need to 1 million times the power to transmit the data back. So the
base station would need to transmit 10^12 times as much power.

I ask because I do not know.

Beware of other technologies such as the tag logging all of it's
movements derived by GPS and storing them 'till it came within range
of a reader and then downloading them as a burst of data.

Policemen could carry readers, and get the history of all your recent
movements. The tag could control access to all sorts of places and
services.

No tag - no joy,

DG
.

Relevant Pages

  • Re: Thunderace Question
    ... It sort of reminded me of a TZR125 when you locked the power valve ... FZR was obviously a hell of a lot quicker once the power kicked in. ... I liked the overall look of it (and the bellypan and mirrors came ... He had a hell of a game with it, he said - the cams, for a start, were ...
    (uk.rec.motorcycles)
  • Re: Italian Go - the latest twists
    ... Education is not a cure; ... Style, money, *power*, in this day and age is what rules - via ... of some sort to look up to while you leant on your crutches, ... in wonder at the evidence of that growth as demonstrated by the Internet. ...
    (rec.games.go)
  • Re: What I learned rereading _Before the Golden Age_
    ... Galactus and similar critters who used "cosmic power" (or "the power ... cosmic") instead of cosmic rays, but the principle is much the same. ... "gamma rays" had the same sort of properties, ... : to distinguish the three species of giant brains: - giant brains that ...
    (rec.arts.sf.written)
  • Re: Why Space Empires?
    ... Space Opera) have some sort of Monarchy and/or Feudalistic system of ... Galactic Empires are cool. ... amounts of power on just a few people tend to make for good story stuff. ...
    (rec.arts.sf.composition)
  • Re: Why Space Empires?
    ... Space Opera) have some sort of Monarchy and/or Feudalistic system of ... government. ... Empire" is more popular than other variations in SF. ... She has a similar function, though even less power, than Asaro's ...
    (rec.arts.sf.composition)