Try to load MDD software into VDR system. Start up and found No MTI and system show slave mode. Connect AIS signal and was able to show on screen.
Then swap the Manta vdr interface pcb FSD-A202 with Manta Radar interface pcb FSD-A223, system detected this pcb and change from No MTI to Tx2. Run simulate mode, it shows very good simulated echo with real AIS targets on screen.