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1.引言近几年内所制造的在双谐波状态下工作的长波和中波广播发射机,能在电声指标高和工作稳定性良好的条件下保证末级的电效率达到90～95%(发射机的工业效率相应地达到70%以至更高)的水平。虽然几十年来所讨论的关
1. INTRODUCTION The long-wave and medium-wave broadcast transmitters, which are manufactured in the past few years and work in the dual-harmonic state, can ensure the electrical efficiency of the final stage to reach 90-95% under the condition of high electroacoustic index and good working stability. (The industrial efficiency of the transmitter correspondingly reaches 70% or higher). Although it has been discussed for decades