Patent ID: 7437134

Claim:
A tuner arrangement comprising: at least one tuner having a plurality of frequency changers, each of which comprises a mixer and a local oscillator; and a controller for controlling a frequency of at least one of said local oscillators, said controller being arranged to perform the steps of: (a) receiving a request for tuning said at least one tuner to a selected channel; (b) determining a nominal frequency of said at least one local oscillator for tuning to said selected channel; (c) performing, in response to the received request for tuning, a calculation to determine whether a beat frequency between a harmonic higher than a first harmonic of said at least one oscillator and a harmonic higher than a first harmonic of another of said local oscillators is within a frequency band within said tuner for said selected channel; and (d) if so, selecting a different frequency of said at least one local oscillator, wherein step (c) when performed a second time calculates said beat frequency within said frequency band, and said step (d) when performed a second time selects another different frequency which differs from said nominal frequency in a direction opposite that of said different frequency.