So if this distance, a if this radius is a then the magnitude of F will just be a.
所以的话，如果这半径是a，那么F的值就是。
The spectrum of amplitude modulated signal are two half magnitude spectrums of base band signal positive and negative shifted by a carrier or R. F. frequency.
调幅讯号之频谱为一半强度基频讯号之频谱分别正负位移一射频或载波之频率。
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