| http://www.w3.org/ns/prov#value | - To achieve frequency agility, however, the down-converter synthesizers may be adjustable, such as by using tunable oscillators or the like, so that each RF signal may be positioned to an available frequency range within the overall frequency spectrum. [0014] In one embodiment, the channel signals are modulated by an appropriate modulator, such as according to quadrature amplitude modulation (QAM)
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