Alliance Tech claims its system is the first radio-frequency identification (RFID) system to track trade show and conference-goers.

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Real-time location system and radio-frequency identification technologies let staff easily locate kits with expired medication or in need of replenishing.

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Patriot missile components including advanced radar waveguides, microwave devices, high-speed analog to digital converters, microprocessors, precision gimbals for the missile-seeker system, highly miniaturized radio frequency communications, on-board sensors, advanced signal-processing systems.

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They acknowledge the difficulties caused by choosing radio-frequency chips instead of a system where direct contact must be made with the reader.

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It's always nice to see an old tech stage a comeback and this time it's happening around the coasts of Europe, with nine low-frequency radio transmitters substituting for GPS' satellite-based system. eLoran's radiowave-based system is stronger than satellite signals and less jammable, based on the Loran system that was previously used for shipping navigation by both the British and US navy over 50 years ago.

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