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Q: micro transmitters/receivers ( No Answer,   2 Comments )
Question  
Subject: micro transmitters/receivers
Category: Science
Asked by: magicman-ga
List Price: $5.00
Posted: 18 Nov 2002 13:21 PST
Expires: 18 Dec 2002 13:21 PST
Question ID: 110108
I am looking for a product that will code micro chips that can be
implanted in each of 52 cards in a deck or into other items that would
signal me from a short distance their nature. I would then want a
transmitter and receiver small enough to conceal. I am a magician.
Where can I find such a product?

Request for Question Clarification by josh_g-ga on 18 Nov 2002 19:35 PST
Could you give a rough idea of what you mean by "small enough to
conceal"?  There are handheld devices that might do what you want, but
the size of the reader would be the key limitation.

Clarification of Question by magicman-ga on 19 Nov 2002 06:17 PST
There is a product sold by a magic company. I will copy some of the
description-this might help-The magician, while in another room,
instantly guesses what card has been picked and put into a box which
is then covered with a top making it impossible to look into. There is
a microchip in the card, read by a transmitter, which is under the
table on which the box sits. The signal is sent to the magicians
receiver which tells the name of the card picked.

What I am looking to do is have the ability to program chips, place
them in varios objects, such as cards, and read their identiy in
another room by way of a cocealed micro transmitter where the audience
member is and a receiver on my person.
Hope this helps. Magicman

Clarification of Question by magicman-ga on 19 Nov 2002 13:02 PST
It probably is a scanner type device. The transmitter is under the
table upon which the card resides. It then transmits to a reciever I
would hold in another room identifyiny the card which has been "read"
by the transmitter and sent to me. What I see in the ad is this-a
playing card box which on its bottom end has an electronic read out of
the card picked-I would be in posession of that box-the cards from
that box-having been coded in some way-perhaps as they do in store
tags-are with the spectator who puts one on the table under which is
the transmitter.  Is this of any more help? Magicman

Clarification of Question by magicman-ga on 20 Nov 2002 09:35 PST
Yes-your last description sounds right. There would have to be a coder
of some sort to code each metal strip. Now, back to the
question-where, from whom, could I acquire the equipment to do this?
Magicman

Request for Question Clarification by haversian-ga on 20 Nov 2002 10:09 PST
What is your budget here?

I have no clue what the prices are (haven't investigated), but Alien
Technology ( http://www.alientechnology.com/ ) just sold half a
billion RFID tags to Gillette - you might be able to find something
similar.  If this looks to be workable, let me know and I'll see if I
can find a small-volume source for you.

Clarification of Question by magicman-ga on 21 Nov 2002 06:07 PST
I would be willing to pay up to $750 for the ability to program the
items put into  playing cards,the transmitter and the receiver. See
what you can do. Thanks Magicman
Answer  
There is no answer at this time.

Comments  
Subject: Re: micro transmitters/receivers
From: southof40-ga on 18 Nov 2002 19:01 PST
 
I'm struggling a bit to see how you could 'focus' your receiver on one
particular card ?

If you were to give me three cards - and there were three cards on the
table I presume you would expect your receiver to be sufficiently
directional to 'focus' onto the three cards I was holding ? Sounds a
bit tricky ...

On a different front it occurred to me that some sort of visual clue
might be used - let's see ... you wear spectacles which enhance light
in the infra-red (warning ! don't know if such a thing exists in a
form which would not make it obvious you were wearing them). On table
is a I-R light source. On cards is a marking in I-R reflective
material. Thus you may see markings whilst others may not. Would this
be suitable ? Or do you need to detect card without any line of sight
?

Interesting problem - quite challenging given size and power
constraints...
Subject: Re: micro transmitters/receivers
From: flajason-ga on 19 Nov 2002 11:30 PST
 
I don't believe that there is an actual microchip embedded in the card
as originally indicated.
What you described in your clarification sounds a lot like the
scanners used on shoplifting tags.
Speculation on how this would work:
A small strip of a special metal is insterted into the card. It is
passive.
An induction loop is concealed within the box that does contain the
microchip (and power source) and is sensitive enough to determine what
card is in the box based on the size and/or shape of the metal strip.
It can then transmit the card to your concealed receiver. Does that
sound like what you are looking for?

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