论文部分内容阅读
六、调制器信号发生器的主要用途是作为发信机的模拟来调试接收机,因此,它必须具有各种方式的调幅和调频.根据收音机和电观机的需要,正弦波调幅应该是声频的或视频的,这是最常见的调幅.在微波信号发生器中,由于测量上的需要,常采用方波调幅,因为微波信号发生器的结构复杂,通常只有主振级而没有放大级,在三极管振荡器或反射速调管上采用正弦波调幅都将引起严重的寄生调频,而采用开关式的方波调幅可将寄生调频减低到最大限度.此外,为了模拟雷达和脉冲通信中的信号,微波信号发生器常具有窄脉冲调幅;
The main purpose of the modulator signal generator is to simulate the receiver as a transmitter simulation, therefore, it must have a variety of ways of amplitude modulation and FM According to the needs of radio and electrical watch, the sine wave amplitude modulation should be audio Or video, which is the most common amplitude modulation.In the microwave signal generator, due to the measurement needs, often using square wave amplitude modulation, because the structure of the microwave signal generator is complicated, usually only the main vibration level without amplification stage, The use of sinusoidal amplitude modulation on a triode or klystron will cause severe parasitic modulation and the use of switched square-wave amplitude modulation to minimize parasitic modulation In addition, to simulate signals in radar and pulse communications , Microwave signal generator often has a narrow pulse amplitude modulation;