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本文针对测量电视机高频调谐器总特性曲线时存在的问题，进行了较为详尽的理论探讨，分析了扫频仪在测量含有混频电路网络时的局限性和一般规律．
In this paper, aiming at the problems existing in the measurement of the total characteristic curve of the high frequency tuner of television, a detailed theoretical discussion is made and the limitations and general rules of the swept spectrum analyzer in the measurement of the network containing the mixing circuit are analyzed.