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TABLE OF CONTENTS

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1 General Description and Theory of Operation................................................................ 9

1.1 Scope .............................................................................................................................. 9

1.2 Purpose of Equipment ..................................................................................................... 9

1.3 Equipment Supplied ........................................................................................................ 9

1.4 Physical Description ...................................................................................................... 9

1.4.1 Antenna ........................................................................................................................... 9

1.5 Functional Description .................................................................................................. 10

1.5.1 Antenna Unit ................................................................................................................. 10

1.5.1.1 Reflector ....................................................................................................................... 10

1.5.1.2 Dual Feed Assembly ..................................................................................................... 10

1.5.2 Polarization and Beamswitch Box ................................................................................ 10

1.6 Theory of Operation ..................................................................................................... 11

1.6.1 Dual Feed Assembly ..................................................................................................... 11

1.6.2 Reflector ....................................................................................................................... 11

1.6.3 Detailed Circuit Analysis .............................................................................................. 11

1.6.3.1 Antenna Unit ................................................................................................................. 11

1.6.3.2 Azimuth Antenna Pattern ............................................................................................. 12

1.6.3.3 Elevation Patterns ......................................................................................................... 12

1.63.4 Other Antenna Specifications ....................................................................................... 12

1.6.3.5 Antenna Reflector ......................................................................................................... 12

1.6.3.6 Reflector Mounting and Tilt Adjustment ...................................................................... 13

1.6.4 Dual Feed Assembly ..................................................................................................... 13

1.6.4.1 Feed Assembly.............................................................................................................. 13

1.6.4.2 Circular Polarization Generation .................................................................................. 13

1.6.4.3 Transmitting Circularly Polarized Signals .................................................................... 14

1.6.4.4 Receiving Circularly Polarized Signals ........................................................................ 14

1.6.4.5 Transmitting and Receiving Linearly Polarized Signals .............................................. 15

1.6.4.6 Feedhorn Assembly ...................................................................................................... 15

1.6.4.7 Polarizer/Feed Assembly Mechanical Operation.......................................................... 15

Andrew 174100 User Manual

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