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From: email@example.com (Bob Wilson)
Subject: Re: Tracker implant for children - Real or Fake?
Date: Mon, 09 Sep 2002 00:13:17 -0000
Organization: Your Organization
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References: <firstname.lastname@example.org> <3D7AFA3D.D1C3B84A@earthlink.net>
In article <3D7AFA3D.D1C3B84A@earthlink.net>, email@example.com
>Bob Wilson wrote:
>> In article <firstname.lastname@example.org>,
>> reinier.I_HATE_SPAM.gerritsen@NO_SPAMchampionchip.nl says...
>> >In the Brittish newspaper The Guardian (www.guardian.co.uk, Sept 3,
>> >2002) there was an article "Girl to get tracker implant to ease
>> >parent's fears."
>> >I want to start a discussion about the technology, *not* about ethics.
>> >Some parts of the article:
>> >"Danielle Duval (11-year-old) will have the device implanted in her
>> >arm in the next few months. The miniature chip will apperently send a
>> >signal via a mobile phone network to a computer, wich will be able to
>> >pinpoint her location on a map."
>> >"Professor Kevin Warwick (cybernetics department ar Reading
>> >University) said there were a few technological problems to be ironed
>> >out, including exactly how to recharge the chip's battery, but he
>> >expected Danielle to be fitted with the device, under local
>> >anaesthetic by a doctor, in a few months."
>> >"Among the technical questions to be addressed is wether the chip
>> >should remain dormant in the limb until emergeny arose, or wether it
>> >should emit a signal 24 hours a day."
>> >My local (Dutch) paper wrote that te girl was already chipped. On the
>> >TV they showed a glass transponder of about 3cm length and a few mm in
>> >diameter, the very same transponders our company uses to time
>> >athletes. We read them at about 1m in optimal conditions.
>> >I don't believe this story. As far as I know, it is impossible to make
>> >a GSM compatible transceiver and a battery and an antenna in such a
>> >small volume. If I see the problems to be "ironed out", it cannot be
>> >done in just a few months. *Maybe* you can fit it all in a tiny glass
>> >tube, but the battery will be drained in a few hours at best.
>> >Any comments?
>> >Reinier Gerritsen
>> >The Netherlands
>> So exactly what does this "miniature chip" use as a source of power to
>> it to transmit a significant distant with? And has it changed the laws of
>> physics so it can transmit with an integrated antenna that otherwise is
>> small (electrically) to radiate any significan level of signal?
>> Sounds completely fake to me.
> (1) Absolutely *no* battery needs to be included! Electrochemical
>energy can be directly derived from the fluids in the body.
> (2) Pulsed power needs to be only a few tens of milliwatts (but could
>be as high as 100mW if need), as it is not difficult to detect
> (3) Antenna length can be very short compares to a wavelength and still
>radiate a reasonable amount of energy for "short-range" detection.
> Not fake; see my other response above.
Nonsense! Electrochemical energy needs more than an electrolyte. It needs
electrodes that "corrode" as energy is generated. You want THAT in your
body? And exactly how far do you think the 100mW will travel, given the huge
body absorption that will undoubtably take place. Remember that this is
supposed to be detected a LONG distance away. It is, after all, intended to
detect people that go missing, not someone who leaves the room. This isn't
Of course, an antenna can be electrically short (that was a rather obvious
statement). But its radiation efficiency falls off accordingly. At work, we
are nearing completion of a Flex-based 2-way pager, and one of the problems
is getting enough antenna gain, WITH A 1-WATT TRANSMITTER!, when the thing
is just worn on one's belt. Our antenna is just over 2 inches long, and we
do not have the problem of it transmitting from INSIDE one's body.
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