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Help me with designing a wireless auction system

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orpheus

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wireless auction system

hi all

i am the very beginner in rf systems. i have a project rf based auction system. simly the handheld devices to use in a auction. min 400 devices must work in same room. now i dont have a idea. i think i must use premade modules from radiometrix or rfm etc... i'm not sure how can i realize in rf system. what i need in clients two way radio , multicahnnel system ? or radio packetdata controller module ? any suggestions are wellcome.
 

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