Signal can come from cable, satellite antenna, broadband networks, and terrestrial broadcasting.
信号可以来自有线电缆、卫星天线、宽带网络以及地面广播。
2
The broadcasting equipment forces electrons to rush back and forth in the antenna at very high speed.
广播设备使得电子在天线里以很高的速度急剧往返。
3
The calculation formulas of the electromagnetic field produced by the emission antenna of broadcasting and television emission towers and mobile communication stations are given.