300W全固态调频发射机电路分析及使用维护

The Circuit Analysis and Maintenance of the 300W Entire Solid State F.M.Transmitter

以FM301S-IV 300 W调频发射机为例,分析调频发射机的工作过程,重点介绍同轴电缆线射频平衡转换、线绕阻抗变换以及BLF278功放管等功放组成部件的工作原理特点以及使用维护经验。

This article use F. M. 30IS IV300 W F. M. transmitter as an example to analysis the working process of F. M. transmitter and focus on introducing the working and maintenance experience of the equilibrium con- version of coaxial cable radio frequency, wire wind impedance conversion and BLF278 power amplifier pipes parts. For this last stage power amplifier circuit in typical case, most 300 W F. M. power amplifiers use the same circuit, and there are few articles introducing its principle in detail, so analyzing it in detail is good for rational cognition in maintenance, truly achieve knowing that. The last stage power amplifier knowledge intro- duced in this article can also be used 1 kW or higher power amplifier circuit.