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FM测试设置FM deviation 输入22.5kHz的原因是什么?
没有资深工程师吗,不开森
The frequency deviation of a radio is of particular importance in relation to bandwidth, because less deviation means that more channels can fit into the same amount of frequency spectrum. The FM broadcasting range (88–108 MHz) uses a channel spacing of 200 kHz, with a maximum frequency deviation of 75 kHz, leaving a 25 kHz buffer above the highest and below the lowest frequency to reduce interaction with other channels.[1] AM broadcasting uses a channel spacing of 10 kHz, but with amplitude modulation frequency deviation is irrelevant.
FM applications use peak deviations of 75 kHz (200 kHz spacing), 5 kHz (25 kHz spacing), 2.25 kHz (12.5 kHz spacing), and 2 kHz (8.33 kHz spacing).
感谢cloud8236的分享,再问一下,那测试FM性能时,为什么仪器不设置FM deviation=75khz或者其他别的而是设置22.5khz,没看到有这
个说明啊?还有,有什么相关的文档分享下吗,不胜感激!
FM广播的额定工作频偏为22.5kHz,就是这么定义的。
有相关文档可以分享下嘛
找度娘啊,上面很多的
FM调频技术介绍.pdf(399.59 KB)
给你上传了个文档,有
感谢分享,
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