Patent ID: 7116963

Claim:
A tuning method comprising: (a) mixing a channel of interest from a channelized spectrum having a predetermined channel spacing with a first local oscillator signal; (b) mixing the channel of interest with a second local oscillator signal having the first frequency and being approximately in quadrature with the first local oscillator signal; (c) wherein the first local oscillator signal has a first frequency that is (1) one-half of a channel spacing displaced from an integer multiple of the channel spacing, and (2) selected to frequency translate the channel of interest to within a passband whose lower edge is spaced from DC by about the channel spacing and whose width is about the channel spacing; (d) the channel of interest has a predetermined maximum bandwidth less than the channel spacing; (e) the channel of interest lies within one of an upper high frequency spectrum of interest and a lower high frequency spectrum of interest; and (f) the method further comprises providing spectrum coverage within one of the high frequency spectra of interest and not the other.