Overview
An optional cable allows the user to remotely control the antenna axes, using the
Portable Maintenance Control Unit (PMCU) located in the 7150 drive cabinet.
2.2 System Specifications
As shown in Table 2-1, the 7200 ACS has specifications that reflect performance
sufficient for virtually any communications system antenna, as well as Tracking,
Telemetry, and Control (TT&C) applications. Tracking accuracy within 5 percent of
the receive antenna beamwidth are achievable due to the advantages provided in
the sophisticated OPT modeling. The overall tracking accuracy is related to the
resolution of the angular position display system, which is configured according to
individual system requirements.
TABLE 2-1 7200 ACS SPECIFICATIONS
Tracking Accuracy
Nominally more than 10% of receive 3 dB beamwid
th, RMS, in Steptrack mode.
Nominally 5% of receive 3 dB beamwidth, RMS, with valid model in OPT mode
(independent of orbit inclination).
Position Encoding
1) (Standard) Absolute, single-speed, brushless resolvers (size 11) and 16-bit monolithic
LSI tracking resolver-to-digital conversion IC's with 0.02° RMS accuracy.
2) (Optional) Absolute, electrical two-
speed, brushless resolvers (size 20) and paired LSI
tracking resolver-to-digital conversion IC's with 0.01° peak accuracy.
3) (Optional) Absolute optical encoders w/accuracies to ±0.004° over 360° range.
Front Panel Position
0.01° Standard – Single speed resolvers
0.001° (Optional - Available only with two-speed resolvers or optical encoders.)
Position Encoding
Typically 1 LSB of resolver-to-digital conversion resolution
Input Power
Requirements
Drive cabinet
(two factory configurations available):
1) 208-240 VAC, three-phase, 50-60 Hz, 5-wire WYE.
2) 380-415 VAC, three-phase, 50-60 Hz, 5-wire WYE.
Drive Cabinet current requirements are determined by the motor horsepower.
Antenna Control Unit (Rack Mount): 100-240 VAC, 50-60 Hz; 75 VA (Nominal)
1/2 to 20 HP; Others available per special order
ACU Tracking
Receiver Interface
GDST Model DTR - Serial Port (Standard) EIA/TIA-232E or EIA/TIA-422B.
GDST Model 253 - Analog: Single 0 to 10 VDC analog input;
Contact closure outputs available for selection of up to four beacon signals for legacy
fixed frequency receivers.
Remote
Communications
10BASE-T Ethernet Port (IEEE 802.3) for remote monitor and control.
Or EIA/TIA-232E 115.2 kbps max. or EIA/TIA-422B (115.2 kbps max.)
(Optional) IEEE-488 GPIB (General Purpose Interface Bus).
Summary Alarm
Output
Normally closed dry contacts, ratings:
Maximum Voltage 220 VDC or 125 VAC.
Maximum Switched Current 1 Amp
Maximum Switched Power 62.5 VA
System
Interconnect
Cabling
*ACU/drive cabinet interface (1) 25/C, #22 AWG
*Resolver/ACU (2) three-shielded pair, #22 AWG (two-axis systems)
*(3) three-shielded pair, #22 AWG (three-axis systems)
*100 feet of interconnect cabling
*Additional cabling is available up to a maximum length of 1500 feet
*Two-speed and optical encoding systems cabling requirements specified for each
2-2
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