Patent ID: 7764940

Claim:
A method for assisting in the determination of non-interfering local oscillator (LO) frequencies (f 1 , and f 2 ) in a dual conversion tuner system, said method comprising: determining band edges A, B, C, and D of a system output band and its image using the formulae A=−f OUT −f BW /2 B=−f OUT +f BW /2 C=f OUT −f BW /2 D=f OUT +f BW /2, where f OUT is the system output pass band center frequency and f BW is the bandwidth of the system output pass band; for a selected harmonic of f 1 , calculating a smallest harmonic of f 2 greater than band edge A, m A , and a smallest harmonic of f 2 greater than band edge D, m D , using the formulae m A =└( n×f 1 −A )÷ f 2 ┘ m D =└( n×f 1 −D )÷ f 2 ┘, where n is the selected harmonic of f 1 ; and determining if m A =m D .