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[aprssig] RFID antennas

Scott Miller scott at opentrac.org
Mon Jul 21 18:36:33 UTC 2008


I haven't been following this thread in any detail... did anyone mention 
the RFID tag system used for tracking attendees at HOPE last weekend? 
Or was that what brought this up in the first place?

I couldn't find any details on how they were determining positions, but 
the hardware looks cheap enough.  I only stumbled across it because Ed 
Cummings from PopComm called me to ask some questions about my ADS-SR1 
simplex repeater for a talk he was giving there.

Scott
N1VG

Wes Johnston, AI4PX wrote:
> Why not use those little 433mhz data transmitters?  They are $10 each, 
> right?  They have limited range, right?  Hook to a 16f84 for $6.  Seems 
> that any PCB shop could make the PCB that held the ceramic resonator, 
> 16f84 and the 433mhz transmitter in groups of 5 to 10 and we'd cut them 
> apart at home.  In other words, you'd order them 10 at a time from a 
> place like pcbexpress.com <http://pcbexpress.com>   If I were doing this 
> (and I may), I'd use SMT so there were no pricklers sticking thru the 
> board... would make a nice name tag to pin on your shirt.  It would run 
> off coin cells so it would be flat.  TX would be randomized since 
> there's no receiver on the badges.  Maybe a push button for forcing a 
> squawk.
>  
> Wes
> 
> On Sun, Jul 13, 2008 at 11:05 AM, Bob Bruninga <bruninga at usna.edu 
> <mailto:bruninga at usna.edu>> wrote:
> 
>      > "The Texas Instrument HF Antenna Cookbook."
>      > The designs are for RFID at 13.56 MHz.
> 
>     I seriously want to see the ARRL/Ham radio invest in RFID for ham
>     radio ops.  Embed the chip in the ARRL name tag.
>     Then we can have gateways to APRS...
> 
>     Put one at each venu or checkpoint or clubhouse, or whatever.
>     Range should be about 100 feet...
> 
>     Bob,WB4APR
> 
> 
> 
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> 
> 
> 
> -- 
> Wes
> ---
> Where there's silence, there is no Hope.
> 
> 
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