narrowband emission

例句：

1. 1. The radio waves were emitted from a narrow-band transmitter.
   无线电波是从窄带发射器发出的。
2. 2.The satellite's narrow-band emissions were picked up by the ground station.
   卫星的窄带发射信号被地面站接收到。
3. 3. The narrow-band emissions of the radio signal are being analyzed to determine its strength.
   正在分析无线电信号的窄带发射以确定其强度。