1) Connect the system as shown in Figure 3, and the antenna is powered up to check the LO switch position on BUC by visual inspection and set the related switch position via control terminal or PC, so that it is automatically pointed to the target satellite;2) Turn off the system and switch the on-off position on BDC, and then turn it on, the related LO switch position is not set via control terminal or PC at first. Vehiclery out observation on the antenna for a while, and it is found the locking on target satellite is not successful, and then set related switch position on BDC via PC or ctrl terminal, the antenna can lock on target satellite normally.