CG-1280 Rev. N 09/13 - General Dynamics SATCOM Technologies

OverviewIn applications requiring closed-signal-loop tracking (Steptrack and OPT), a serialconnection between the General Dynamics DTR tracking receiver and the 7200ACU provides the ACU with the beacon signal level. Alternatively, an analogtracking signal is accepted through the ACU rear panel via J21 (a 9-pin D-connector). The nominal tracking voltage input is in the range of 0 to 10 VDC,with a slope of 0.2 V/decibels (dB) to 1.0 V/dB. Beacon select outputs areprovided on a 7200 ACU rear panel terminal strip (TB1), allowing remote manual orautomatic beacon selection with General Dynamics tracking receivers.Full function remote control of the tracking system is facilitated through the10BASE-T Ethernet port or one of the serial ports (both EIA/TIA-232E and EIA/TIA-422B are provided). An IEEE-488 (also known as GPIB), interface is also availableas a factory option.A summary alarm contact is provided on the ACU rear panel user interface terminalstrip TB1. The contact can be wired to a warning light, buzzer or M&C interface toalert the station operators that the 7200 ACU has a summary fault condition.2.4 System HardwareThe 7200 ACS consists of the following subsystems:• Model 7200 ACU• 7150 Drive cabinet• Position Feedback DevicesThe system interfaces with three-phase induction motors for AZ and EL positioningand a single-phase AC synchronous stepping motors for POL rotation. Limitinterfaces are for normally closed switches that open upon engagement.2-5