Installation, Operation and Maintenance Bulletin OM49 Revision G Type ES49( ) 4.9-Meter ESA 4.9-Meter Earth Station Antenna Notice The installation, maintenance, or removal of antenna systems requires qualified, experienced personnel. Andrew installation instructions have been written for such personnel. Antenna systems should be inspected by qualified personnel to verify proper installation, maintenance and condition of equipment.
Table of Contents Introduction Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Proprietary Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Information and Assistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Notice . . . . . . . . . . . . . .
4.9-Meter Earth Station Antenna Introduction Like all Andrew earth station antennas, the 4.9-Meter Earth Station Antenna provides high gain and exceptional pattern characteristics. The electrical performance and exceptional versatility provides the ability to configure the antenna with your choice of linearlyor circularly-polarized 2-port or 4-port combining network. That versatility is provided at the time of initial purchase, as well as in the future, as your satellite communication requirements evolve.
Proprietary Data The technical data contained herein is proprietary to Andrew Corporation. It is intended for use in operation and maintenance of Andrew supplied equipment. This data shall not be disclosed or duplicated in whole or in part without express written consent of Andrew Corporation. Information and Assistance Andrew Corporation provides a world-wide technical support network. Refer to the technical assistance portion of this this manual for the contact numbers appropriate to your location.
How to Use This Manual Overview The scope of this manual is intended to provide station personnel with the base installation, operation, and maintenance requirements necessary for a 4.9-Meter C-, X-, Ku- or K-band Earth Station Antenna. This manual provides a convenient reference for authorized operator/service personnel requiring technical information on general system or specific subsystem equipment.
Getting Started Overview The installation, operation, and maintenance of the 4.9-Meter Earth Station Antenna requires qualified and experienced personnel. Andrew installation, operation, and maintenance instructions are illustrated for such personnel. Additionally, the antenna should be inspected by qualified personnel to verify proper installation, maintenance, and condition of equipment as described in Preventive Maintenance.
NOTE: Failure to follow an installation procedure could result in damage to equipment or personal injury. Additional warnings will be displayed throughout this manual for your awareness. These warnings can be identified in warning boxes as shown in the following sample. Andrew disclaims any liability or responsibility for the results of improper or unsafe installation, operation, or maintenance practices.
Parts Verification Reporting Equipment Loss or Damage Reporting Visible Loss or Damage Andrew Corporation thoroughly inspects and carefully packs all equipment before shipment. If you find that there are missing components, please notify Andrew Corporation immediately by contacting the Customer Service Center (refer to page 4). If you find that there was damage caused to the equipment during the shipping process, a claim should be filed with the carrier.
Returning Equipment Andrew Corporation tries to ensure that all items arrive safe and in working order. Occasionally, despite these efforts, equipment is received which is not in working condition.
Installation Procedures Overview Foundation Preparation This section provides installation procedures for the 4.9-Meter Andrew Earth Station Antenna. The installation procedures include instructions on the following antenna components: • Reflector/Enclosure • Reflector-to-Mount Assembly • Mount • Subreflector Before beginning the installation process on the ground mount assembly, ensure that the foundation has been prepared.
Foundation Preparation Figure 1b 11 Installation Procedures
Foundation Notes 1. Remove all burrs and sharp edges. 2. Dimensions apply before plating. 3. Interpret drawing per ANSI Y14.5M-1982. 4. Dimensions are shown in feet and inches. Dimensions in brackets [ ] are in millimeters. 5. A tolerance of ±1/8" [3] applies to all anchor bolt layout dimensions. 6. Foundation Notes: A) This foundation is a typical design only. Certification of it's suitability for a particular installation by a professional engineer is required prior to it's use for actual fabrication.
A325 Tensioning During the installation process, there are several references to the A325 hardware tensioning procedure. The A325 hardware must be properly tensioned to avoid slippage between bolted surfaces under high loads. Slippage can cause the corresponding assembly to move, causing antenna misalignment. When designated, the A325 hardware should be tightened according to the following tensioning procedure. NOTE: Tensioned bolts are for final connections only and should not be loosened for reuse.
Reflector/Back Structure Assembly Use of A325 hardware eliminates slippage between mating surfaces under high loading conditions as well as the need for future retightening. Refer to the A325 tensioning procedure in preceding installation text. CAUTION: Adhere to any special instructions stenciled on crate relative to crate opening, contents removal and/or personnel safety.
Step 2 Loosely attach 302511 Ribs to 302648 Short Struts as shown in Figure 4. Note: Do not fully tighten hardware at this time. Support end of rib until 302509 Long Strut is installed.
1/2” ID x 5/8” ID x 1” OD 1/2” 1-5/16” OD Flat Lock Flat Washer Washer Washer (9997-65) (9974-64) (9997-236) 1/2” Hex Nut (9999-61) 302511 Rib Reference Drawing 240272 5/8” ID x 1-5/16” OD Flat Washer 5/8” x 1/2” (9997-236) Shoulder Bolt (9858-36) 5/8” x 1-3/4” Bolt and Nut Assembly (45980-14) 5/8” x 1-3/4” Bolt and Nut Assembly (45980-14) 5/8” ID x 1-5/16” OD Flat Washer (9997-227) 302509 Long Strut Step 4 Step 5 Figure 5b When all 12 rib/strut sets have been loosely assembled, securely tighten a
Step 6 Attach the reflector panels (with skirts) by placing them on the ribs and sliding them inward carefully guiding them until the rib and panel holes align. Place the seam hardware in the fourth hole from the outboard edge on both sides of the panel to set panel bay spacing, finger tighten only. Install remaining reflector panel hardware, finger tight only. Note: Panels should be installed opposite each other to ensure proper balancing of the enclosure assembly.
Subreflector Support Brackets Step 1 Attach four 206278 lifting tabs across the second and third pairs of reflector seam holes from reflector center as shown in Figure 8. Note: Do not fully tighten lifting tab hardware at this time. Reference Drawing 240272 Note: To be removed after reflector installation on ground mount.
Step 2 Attach the four 302518 Subreflector Support Brackets at the 15th (outer most) reflector panel hole position from reflector center on ribs 2, 5, 8, and 11 as shown in Figure 9. Note: Do not fully tighten subreflector support bracket hardware at this time.
Rotating Tube Assembly Note: Applicable feed installation drawings are included with each feed system. Step 1 Install 302356 Rotating Tube Assembly as shown in Figure 10. Ensure 302507 Support Struts attach to ribs 2, 5, 8 and 11 as shown. Note: Ensure all support struts are attached to same side of reflector rib and rotating tube mounting tab. Fully tighten mounting hardware except for 3 bolts that attach polarization drive as shown in Figure 11.
Polarization Drive Installation Step 1 Attach the Polarization Drive Assembly as shown in Figure 11. Measure and cut chain to proper length. Step 2 Attach chain to coupling link on each end with supplied connecting link. Step 3 Pull pillow blocks and sprocket assembly back until chain is tight. Tighten bolts holding pillow blocks in place. Note: If a motorized polarization drive or LNA support kit is to be installed, ensure these installations are complete before installing the combiner.
Subreflector Assembly Step 1 302769 Apex Angle Bracket Loosely attach four 302767 Subreflector Struts together with the four 302769 Apex Angle Brackets as shown in Figure 12. Note: The struts are not connected to the reflector at this time.
Step 3 Install 302514 Subreflector Assembly to the 302768 Subreflector Ring Support Brackets as shown in Figure 14. Securely tighten all subreflector assembly hardware at this time.
Pedestal Ground Mount Assembly Pedestal Installation The pedestal mount is an elevation-over-azimuth mount optimized for geostationary satellite applications. The mount enables continuous elevation adjustment from 0 to 90°. The azimuth axis has 360° of travel with 40° (±20°) of continuous travel at each adjustment position. The azimuth lug can be positioned every 30° around the pedestal tube. Follow the subsequent procedures for proper installation of pedestal ground mount assembly.
Step 3 Refer to Figure 16. Using the 6 foot nylon choker under the stinger arm, and the 3 foot choker around the elevation pivot tube, lower the pedestal into position over the anchor bolts. Note: Hex nuts and flatwashers supplied with 302689 anchor bolt kit. Reference Drawing 240299 3 Ft. Choker TOP VIEW 6 Ft. Choker 3 Ft. Choker 6 Ft. Choker 3 Ft. Choker Reference Drawing 240349 6 Ft. Choker 3 Ft.
Step 4 Level the pedestal plumb within ±0.5° using the leveling nuts provided. Step 5 Secure pedestal with washer and nuts as shown in Figure 17. Level Pedestal Plumb Within ±0.
Step 6 (Motorized Mount Only) Refer to Figure 17B. Attach Az/El Jack Screw Assemblies and pedestal jack arm to pedestal assembly as shown. Reference Drawing 240349 9997-202 Flatwasher 45980-28 3/4” x 2.
The ground mount assembly is now completed with the necessary essentials. All ground mount options have separate instructional bulletins located in the parts kit that contain the option. Reflector to Ground Mount Assembly Step 1 The next step in the installation process is the reflector assembly. Proceed to the next step to begin installation of the reflector. Using 5/8” shackles, attach four 16 foot chokers provided to reflector lifting lugs. Lift reflector as shown in Figure 18.
Step 2 Gently lower the reflector assembly into position and attach to elevation pivot lugs using 3/4” hardware as shown in Figure 19. Note: Refer to A325 Tensioning Procedure on page 13. • Use indicated hardware and securely tighten. Note: After attaching the reflector, the crane may now be removed while the antenna is in the zenith position.
Subreflector Installation and Adjustment Step 1 IMPORTANT Failure to conform to the following alignment procedures may result in non-compliance to antenna performance specification. Carefully raise the completed subreflector assembly into place with the reflector in the zenith position. Attach the subreflector assembly to the reflector as shown in Figure 20. Note: All INTELSAT Type Approved antennas do not require further subreflector adjustment after performing Steps 2 thru 8.
Step 2 Reference the appropriate feed installation drawing and install the feed system assembly. Note: The feed installation instructions are packaged as part of the feed system kit. Step 3 Adjust the height of the subreflector with the 302752-( ) Subreflector Setting Rod. Rest the square end of the setting rod on top of the first panel seam screw. Choose a screw which is nearest one of the subreflector adjustment threaded rods. Refer to Figure 22 for threaded rod adjustment locations.
Reference Drawing 240272 Subreflector Centering Adjustment Hardware (3 Places) Threaded Rod Adjustment Location (3 Places) Figure 22 Step 6 Recheck subreflector centering and height settings. Step 7 Remove and store 206278 lifting tabs. Replace panel seam hardware at lifting tab locations. Step 8 Final Subreflector Settings should be performed with antenna either in operating position or a nominal 30° elevation angle.
Operation Overview There are several procedures that may be used to properly acquire the satellite. Andrew recommends that a spectrum analyzer be used. The following procedures provide explanation as to how to use the spectrum analyzer. Acquiring A Satellite While viewing the spectrum analyzer screen, a signal as shown in Figure 4-1 will probably be observed. Additionally, some transponder signals may be observed above the noise signal as shown.
The following steps provide the procedure for acquiring a satellite. Step 1 Begin by obtaining the correct Az/El pointing data for the satellite of interest based on specific calculations for this particular site. Step 2 Using an inclinometer placed on the enclosure drum surface, position the antenna to the specified elevation angle.
Step 7 Move the antenna in azimuth to obtain a null, then move ± in elevation to obtain a large peak signal. If not, move the antenna in the opposite azimuth direction through the peak and again move ± in elevation to obtain a large peak signal. If a larger peak is not found, you were on the main lobe. NOTE: The following explanation for polarization adjustment addresses the special case of full transponder signals. Some applications may include partial transponder signals.
Step 10 With all 24 transponder signals of approximately equal amplitude appearing on the spectrum analyzer screen determine the specific antenna system and satellite parameters. Rotate the feed assembly as required until the appropriate (odd or even) transponder signals are maximized.
Subreflector Adjustment After the satellite has been acquired and testing has taken place with the spectrum analyzer, the subreflector may need to be adjusted to maximize optimum performance of your antenna. The following procedures should be followed if a subreflector adjustment is required to maximize optimum performance. NOTE: All INTELSAT Type Approved antennas do not require subreflector adjustment upon completion of mechanical adjustments referenced on pages 30 and 31.
Preventive Maintenance Overview This section contains periodic preventive maintenance instructions for the 4.9-Meter Earth Station Antenna. Included in this section are inspection and preventive maintenance procedures including cleaning and lubrication, painting, and an operational voltage/current checkout procedure deemed within the capabilities of the average station technician.
Mechanical Parts Clean mechanical parts by first removing dust, dirt, and other loose contaminants with a scraper, stiff brush (bristle or wire in the case of rust or other corrosion), or cloth or compressed air at 25 to 40 psi. Any accumulated imbedded dirt, corrosion, grease, or oil deposits that require further cleaning may be removed with a bristle or wire brush and a cleaning solvent such as trichlorethylene or equal.
• Visually inspect the feed window for dirt and the feed, feed supports, feed window, and reflector for distortion, foreign object damage and environmental deterioration due to ice and snow, dust, rain, hail, and high winds, etc. which may cause electrical component and/or structural deformation.
Preservation of Component Parts Aluminum Parts When preserving the component parts, refer to the following paragraphs in this section. Remove all loose paint and corrosion by scraping, wire brushing, or using steel wool. If using steel wool near the feed window, make sure that none remains on the feed horn window. Edges of existing paint can be blended with the metal surface by using a fine grit sandpaper.
any protective caps and clean off each lubrication fitting prior to injecting fresh grease. The elevation and azimuth jackscrew assemblies are equipped with a grease fitting and corresponding pipe plug on opposite sides of the jack housing. Remove the appropriate pipe plug and fill with with grease until lubricant seeps from the pipe plug opening. Replace and securely tighten pipe plug. The following is a list of the lubricant characteristics: • Mobil Temp SHC32 A non-soap hydrocarbon fluid type grease.
