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This paper presents the simulation and test result of a project for Wireless Data transmission through UART Port using ARM & RF Transceiver in license free band of frequencies 2.4GHz to 2.4835 GHz. It uses ARM7 and MRF24J40 for Wireless Data transmission through UART Port for short-range up to 500 meters. The speed of data transmission is of 250 kbps. The Output power of source module for 500 meters is 0 dBm to 22 dBm. The Receiver sensitivity of the receiver module is -95dBmdoi:10.15623/ijret.2014.0307024 fatcat:pfbinql7g5dwzfmu2t6ojeyvle