MODEL 12974
I-Band Antenna and Two-Axis Pedestal
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The TSTAP Series Model 12974 I-Band Antenna and Pedestal System consists of an internal servo driven two-axis pedestal and antenna system. This system can be positioned in elevation and azimuth by externally controlled sigital inputs with accuracy to within 0,.1°. The pedestal is capable of simultaneously moving the antenna in azimuth and elevation up to 45°/sec. Elevation travel is from -5° to +95° in elevation. |
The Model 12974 I-Band Antenna is comprised of a reflector antenna coupled with a WR90 waveguide and horn assembly and a rotary joint in the azimuth and elevation assemblies. This emitter antenna operates from 8.5 to 10.3 gHz. Other frequencies are available. The feed is sealed with a Kapton window allowing pressurization to 15 psig.
The two-axis pedestal is equipped with a pulse width modulated servo drive system and power supply. The externally controlled pedestal is capable of simultaneously rotating the antenna in azimuth while positioning it in elevation. The rotating velocity and elevation travel of the pedestal are software-limited but can be operator controlled to meet specific customer requirements. Two specially designed low backlash, heavy duty steel spur gear systems provide durable as well as reliable means of positioning a payload. A 650:1 ratio provides extremely smooth movement. An integrated slip ring/rotary joint package allows signal routing through the pedestal. Electro-mechanical limits at the elevation axis extremes, interlock switches on the access doors, as well as stow pin mechanisms, hand cranks, and brakes on both axes provide an added safety measure.
The pedestal receives digital commands from a remote computer input. Resolvers located in each axis transmit azimuth and elevation positioning information accurate to within 0.1°. An azimuth offset capability is included in this system. The offset feature allows the user to program the desired offset for alignment purposes. Circuit protection for the system if provided via a 6 amp circuit breaker located within the pedestal. Cable lengths to 400' interface the remote control source with the pedestal. The microprocessor controller is located in the pedestal base.
MODEL 12974
SYSTEM CHARACTERISTICS
| Mechanical | |
| Axis Arrangement: | Elevation over azimuth |
| Azimuth Velocity: | 0 to 15°/sec (other velocities available) |
| Azimuth Travel: | Continuous, CW or CCW |
| Elevation Velocity: | 0 to 15°/sec (other velocities avasilable) |
| Elevation Travel: | 10° to +100° (software selectable) |
| Drive Motor: | 40 Volt, DC, permanent magnet |
| Drive Gear Backlash: | +/-0.2°, maximum |
| Load Capacity: | 500 lbs, minimum |
| Bending Moment: | 1000 ft. lbs, minimum |
| Output Torque: | >250 ft. lbs. |
| Speed Ratio: | 650:1 |
| Resolver Accuracy: | 16-bit |
| Electrical | |
| Drive System: | Two-axis, pulse width modulated servo drive system with power supply |
| Primary Power: | 115 V, AC |
| Circuit Protection: | Circuit breakers |
| Current Drain: | 10 amps maximum |
| Signal Routing: | Rotary joint/slip ring package |
| Safety: | Stow pins for elevation & azimuth axis as well as elevation limit switches |
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