航空航天部23所成功地研制了SW100-I型大功率短波广播发射机.该机的音频系统选择了脉冲宽度调制式(PDM),射频系统采用了自动调谐线路,研制中运用了计算机优化设计,关键零部件采取了独特的设计技术和特殊的制造工艺,1～8频道的输出功率在100kW以上,效率大于65％,9～11频道的输出功率接近100kW,效率达61％.由于采用了超蒸发冷却系统,整机结构紧凑,该机振幅频率特性约±0.5dB,非线性失真约2.5％、噪声电平小于-55dB,载波跌落小于1％、边带功率损失小 Aerospace Department successfully developed SW100-I type of high-power shortwave radio transmitters 23. The aircraft’s audio system selected pulse width modulation (PDM), radio frequency system uses automatic tuning circuit, the development of the use of computer-optimized design , The key components adopt a unique design technology and special manufacturing process, 1 to 8 channel output power of 100kW above, the efficiency is greater than 65%, 9 ~ 11 channel output power close to 100kW, the efficiency of 61%. As a result of Super Evaporative cooling system, the whole structure is compact, the amplitude and frequency characteristics of the aircraft about ± 0.5dB, nonlinear distortion of about 2.5%, the noise level is less than-55dB, carrier drop less than 1%, the sideband power loss is small