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[aprssig] APRS RFID reader?

Robert Bruninga bruninga at usna.edu
Mon Feb 1 21:51:59 UTC 2010

Duh!  That's it!!!  SOLVED! 

> That said you really don't need more range.. 
> Instead of putting the chips on their hats, 
> put them on their feet..

OK, wow, so obvious! we can now do this NOW...  The RFID tags I
found from Sparkfun are $1.76 and they look like a credit card.
Just slip them into the soles of your favorite HAM shoes!

I guess sensitive feet would find this irritating, but you could
buy the more expensive chip for $5 each and attach it
elsewhere..  I also need to find out how much of this plastic
card is RFID, and how much of it is just a card to be used for
other purposes.  Maybe we can just cut off the RFID portion
(much smaller?)...

I wonder how fast the readers can catch the tag?  With only a
10" range,  you have a small chance the foot will hit it, and a
much large chance that the foot will swing through it in abou
0.1 second.  I guess your door mat would need maybe SIX 10 inch
sensor fields for reasonable capture reliability?  Spread them
out so they cover the whole door mat area...

They are fixed coded, 32 bits. Or 4 bytes or 8 hex.  So, all we
need is an APRS message defined so that people can register
their APRS RFID card.  If your code is 1A 2B 3C 4D for example,
you just use your existing APRS system to send a message 


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