在发射端，需要通过功率放大器将信号放大到一定水平，然后才能通过天线发射出去；
In the transmitter, power amplifier will be needed to amplify the signal before they can be send by the antenna;
在发射端，需要通过功率放大器将信号放大到一定水平，然后才能通过天线发射出去；
In the transmitter, power amplifier will be needed to amplify the signal before they can be send by the antenna;
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