Umm, unless RFID has moved beyond what I've been reading lately, this is a short range technology that doesn't use satellites. You'll find more info at:
http://www.rfidjournal.com/faq Some relevant entries: How does an RFID system work? An RFID system consists of a tag made up of a microchip with an antenna, and an interrogator or reader with an antenna. The reader sends out electromagnetic waves. The tag antenna is tuned to receive these waves. A passive RFID tag draws power from the field created by the reader and uses it to power the microchip's circuits. The chip then modulates the waves that the tag sends back to the reader, which converts the new waves into digital data. For more information on the components of a complete system used in businesses, see Getting Started. How do I know which frequency is right for my application? Different frequencies have different characteristics that make them more useful for different applications. For instance, low-frequency tags use less power and are better able to penetrate non-metallic substances. They are ideal for scanning objects with high-water content, such as fruit, but their read range is limited to less than a foot (0.33 meter). High-frequency tags work better on objects made of metal and can work around goods with high water content. They have a maximum read range of about three feet (1 meter). UHF frequencies typically offer better range and can transfer data faster than low- and high-frequencies. But they use more power and are less likely to pass through materials. And because they tend to be more "directed," they require a clear path between the tag and reader. UHF tags might be better for scanning boxes of goods as they pass through a dock door into a warehouse. It is best to work with a knowledgeable consultant, integrator or vendor that can help you choose the right frequency for your application. At 10:36 AM 7/19/2005 -0500, Dan Mehlhorn wrote: >Uh, what do you think we use satellites for now? Broadcast radio uses them >to enlarge the footprint of the broadcaster. TV and Telephone use them as >repeaters, also. Also, anyone hear of SPY SATELLITES??? > >Dan Mehlhorn >Probably will be transported to the nearest Homeland Security Interrogation >office for spilling the frijoles. > >-----Original Message----- >From: Mike Rawlins > >At least Travis caught on to William's joke. Please re-read this in the >context of needing a proofreader: > >"Wal-Mart is already requiring all pallets delivered to its headquarters in >Bentonville, Ark., to be fitted with radio frequency identification tags, >SO THAT THEY CAN BE TRACKED BY A SATELLITE." > >Good one, William! > >Mike > >P.S. If we have to explain it to you, then you probably need to go back and >take RFID 101 again. > > > > >. >Please use the following Message Identifiers as your subject prefix: ><SALES>, <JOBS>, <LIST>, <TECH>, <MISC>, <EVENT>, <OFF-TOPIC> >Access the list online at: http://groups.yahoo.com/group/EDI-L > >Yahoo! Groups Links > > > > --------------------------------------------------------------- Michael C. Rawlins, Rawlins EC Consulting www.rawlinsecconsulting.com Using XML with Legacy Business Applications (Addison-Wesley, 2003) www.awprofessional.com/titles/0321154940 . Please use the following Message Identifiers as your subject prefix: <SALES>, <JOBS>, <LIST>, <TECH>, <MISC>, <EVENT>, <OFF-TOPIC> Access the list online at: http://groups.yahoo.com/group/EDI-L Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/EDI-L/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
