| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-stage conversion radio frequency receiver that avoids conversion spurious. SOLUTION: The method includes steps 20, 22 of obtaining a table of problem frequencies of a first local oscillator relative to a frequency of a second local oscillator which produce harmonic mixing products within the bandwidth of an intermediate frequency filter versus corresponding frequency offsets for the second local oscillator which retune the frequency of the second local oscillator so that harmonic mixing products are moved outside the bandwidth of the intermediate frequency filter and a step 26 of retuning the frequency of the second local oscillator by the corresponding frequency offset from the table when the frequency of the first local oscillator equals one of the problem frequencies in the table.
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