The way of pure pilot-frequency is one that adopts dedicated-channel generator to simulate pure pilot signal.
纯导频方式是采用专门的信道发生器模拟出纯粹的导频信号。
2
As the plane crossed state lines neither pilot realized the jet no longer was on the correct radio frequency and that controllers were growing worried about their failure to stay in contact.
It has the higher switching speed and frequency and can be used as the pilot valve for a larger flow rate valve, or as a direct control valve for small flow rate hydraulic loop.