2.The spaceborne VLF/ELF transmitter and antenna for the communications to submarines is a line or loopwire in the F2-layer of the ionosphere at a height of 300~400 km.
9.When an inverter works in open loop state, loading and unloading will change RMS of the output voltage because of the inductance of the filter, the on state resistance of the IGBT, the resistance of the wire, etc.
10.The high speed welding technology of large-sized wire MAG is used. The DCS (distributed control system) consisted of profibus-dp is used as electric control system. Laser close loop track system is used for weld tracking and mismatch detect.