为加强中波广播的实验工作,我台新近购买和安装调试一批全固态1KW发射机,用以替代南屏1KW电子管机作为主播实验发射机。由于全固态发射机的输出阻抗是50Ω,而原来的电子管发射机的输出阻抗为75Ω(原出厂时为230Ω),这给我们主备机的应用带来困难。为了使作为备机使用的电子管发射机也能在特性阻抗为50Ω馈线和天调网络正常工作,我们决定将其的末级槽路输出阻抗 In order to strengthen the experimental work of the China Broadcasting Corporation, I recently purchased and installed a batch of all-solid state 1KW transmitters to replace the Nanping 1KW electron tube machine as the experimental broadcast transmitter. Since the output impedance of the all-solid-state transmitter is 50Ω, the output impedance of the original tube transmitter is 75Ω (230Ω when originally shipped), which brings difficulties to our application. In order to make the tube transmitter used as a backup device also work properly with the characteristic impedance of 50Ω feeder and the Tone network, we decided to put the output impedance of its final stage