Facilities

OPERATIONAL MODES

Receive and Transmit Capability

  • Located in a remote radio quiet location
  • Dark sky location

Location

  • 5 Mi South of Haswell, Kiowa County, U.S.A. 
    Go south on Rd 19 until you see the antenna.
  • Plishner Dish GPS Location:
    N38° 22′ 51.10″W103° 9′ 22.96″
    N40° 08.900′W105° 13.922′
    38.380796°-103.156358°
    Elevation:1666? m, 5465? ft

ANTENNA

  • Antenna Specification
    Parameter
    Frequencies:400 MHz – 2 GHz
    Diameter:60 feet
    Antenna Gain:42.5 dBi at 1 GHz (see plot)
    Beam Width:2.6°/400 Mhz, 0.7°/2 GHz
    Noise Temperature:1-2db at 400MHz total system-
    Noise Figure:0.8db at 400MHz w/ 20db LNA-
    Coverage:Full Hemisphere†
    Slew Rate Max Az/El:40/40 deg/min
    Slew Rate Min Az/El:??/?? deg/min
    Azimuth Repeatability:?? min
    Elevation Repeatability:?? min
                 
    † Except at low elevation to North

  • Antenna Patterns
  • Antenna Feeds
    • 400 MHz Feed Horn
    • 900 Mhz Feed Horn
    • 1420 Mhz Feed Horn
    • 1665 Mhz Feed Horn
    • LNA from 0.4 GHz to 10 GHz
  • Antenna Drive System
    • Elev Motor: 3hp, 460vac, 1750 rpm motor.
    • Azmith Motor: Synchronous servo motor
    • Speed Control: Variable Frequency Controllers
    • Brakes: Spring set, electrically released.
    • Machine Safeties: End of travel limit switches, Mechanical impact absorbers.
    • Shaft Encoders: Quadrature Relative. 1.17 Minute resolution
    • Shaft Encoders (Future): Absolute encoder, 12 bit, 5.27 min resolution
    • Primary Position Display: Selsyn 2 speed, 6 Minute resolution
    • Computer Position Detector: Quadrature encoder + Reference sensors
    • Computer Analog Resolution: 12 bit
  • Antenna Steering Command Interface
    • Manual control station with selector switchs and rate potentiometers.
    • PC interface using proprietary software
    • PC interface using commercial software
    • User Manual available


Plishner Observatory