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The increasing deployment of CBTC by public transit agencies that use a data communications systems based in the 2.4 GHz ISM band has raised the concern of RF interference between CBTC equipped trains and the variety of new and existing users of this band. The vast number of RF devices that currently operate in this band (like microwave ovens, cordless telephones, medical devices etc.) have recently been augmented by the proliferation of "Wi-Fi" hotspots and wireless computers permitting untethered intemet access by the public and RF identification (RFID) technology.While

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