Overview
In applications requiring closed-signal-loop tracking (Steptrack and OPT), a serial
connection between the General Dynamics DTR tracking receiver and the 7200
ACU provides the ACU with the beacon signal level. Alternatively, an analog
tracking 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 are
provided on a 7200 ACU rear panel terminal strip (TB1), allowing remote manual or
automatic beacon selection with General Dynamics tracking receivers.
Full function remote control of the tracking system is facilitated through the
10BASE-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 available
as a factory option.
A summary alarm contact is provided on the ACU rear panel user interface terminal
strip TB1. The contact can be wired to a warning light, buzzer or M&C interface to
alert the station operators that the 7200 ACU has a summary fault condition.
2.4 System Hardware
The 7200 ACS consists of the following subsystems:
• Model 7200 ACU
• 7150 Drive cabinet
• Position Feedback Devices
The system interfaces with three-phase induction motors for AZ and EL positioning
and a single-phase AC synchronous stepping motors for POL rotation. Limit
interfaces are for normally closed switches that open upon engagement.
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