Andrew 7.6-Meter ESA manual Step

Page 55

Step 1

Step 2

Step 3

Step 4

The following steps provide the procedure for acquiring a satellite.

Manually move the antenna in the azimuth (scanning back-and-forth) to achieve the maximum (greatest amplitude) transponder signals.

Scan in one direction until the amplitude continues to diminish and then scan in the opposite direction until the same condition occurs.

Return to the position yielding the greatest amplitude.

The maximum azimuth excursion from the original setting should not exceed plus or minus 1.5 degrees or the antenna may begin to access a different satellite.

With the antenna positioned in azimuth such that the transponder signals are maxi- mized, follow the same procedure manually moving the antenna in elevation (scanning up-and-down) to further maximize the transponder signals.

Repeat this procedure alternating between the azimuth and elevation excursions of the antenna to peak the transponder signal amplitude.

A transponder signal amplitude of 30 dB or greater from peak to average noise signal indicates the antenna is receiving the signal on the main beam. A transponder signal amplitude less than 30 dB or greater indicates the antenna is receiving the signal on a side lobe of the main beam.

With the antenna peaked on a side lobe in azimuth and/or elevation, move the antenna in azimuth while observing the spectrum analyzer screen as shown in Figure 4-3.

Figure 4-3: Antenna Radiation Pattern Topographical Diagram with Plan View

55

Operation

Image 55
Contents Meter ESA Table of Contents Introduction Meter Earth Station AntennaProprietary Data Information and Assistance Technical Customer Service CenterHow to Use This Manual Overview ContentGetting Started OverviewTool Size Quantity Recommended ToolsGetting Started Returning Equipment Step Overview Foundation Preparation Installation Procedures1b A-325 Tensioning For bolts over four diameters Tensioning StepTripod Ground Mount Assembly Azimuth Beam Assembly Step Support Legs Assembly Step Step Step Panning Frame Assembly Step Step Step Step Step Step Step Elevation Jackscrew Assembly Step Step Azimuth Jackscrew Assembly Step Mount Assembly Joint Assembly Pivot Assembly Step 221923/223180 221738 200088A Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Installation Procedures Operation Overview Acquiring a SatelliteStep Polarization at 45 degrees from Optimum Setting Maximizing Odd Transponders Subreflector Adjustment Preventive Maintenance Overview General Cleaning Electrical PartsPreventive Maintenance Antenna Preventive Maintenance Drive System Voltage Current Checks Step Step Preventive Maintenance Jackscrews/Motors Gear Motor/Housing Fill Drain Requirements Lubrication Chart High-Speed Antenna Lubrication Points Medium-Speed Antenna Lubrication Points