modulation frequency

例句：

1. 1.The radio signal is modulated at a frequency of 2400 MHz.
   无线电信号以2400兆赫的频率调制。
2. 2.The modulation frequency affects the quality of the signal.
   调制频率影响信号的质量。
3. 3. The frequency of this device is modulated to match the transmission line's impedance.
   这个设备的调制频率被调整以匹配传输线的阻抗。