Andrew 3.7-Meter Earth Station Antenna manuale d’uso

Andrew Cor poration 10500 West 153rd S treet Orland Park, IL U.S.A. 60462 T elephone: 708-349-3300 F AX (U.S.A.): 1-800-349-5444 Internet: http://www .andrew .com Customer Service, 24 hours: U.S.A. • Canada • Mexico: 1-800-255-1479 U.K.: 0800 250055 • Republic of Ireland: 1 800 535358 Other Europe: +44 1592 782612 Printed in U.S.A. 9/00 Copyr[...]

Introduction How to Use This Manual Getting Star ted Installation Procedures Operation Prev entive Maintenance T able of Contents 2 T a ble of Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Proprietary Data . . . . . . . . . [...]

Introduction Like all Andrew earth station antennas, the 3.7-Meter Earth S tation Antenna provides high gain and exceptional pattern characteristics. The electrical performance and excep- tional versatility provides the ability to configure the antenna with your choice of linearly- polarized 2-port or 4-port combining network. That versatility is p[...]

Proprietar y Data Infor mation and Assistance Notice T echnical Assistance The technical data cont ained 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 Corporati[...]

Ov er view Content The scope of this manual is intended to provide station personnel with the base inst alla- tion, operation, and maintenance requirements necessary for a 3.7-Meter C- or Ku-Band Earth S tation Antenna. This manual provides a convenient reference for authorized operator/service personnel requiring technical information on general s[...]

Ov er view Warnings The installation, operation, and maintenance of the 3.7-Meter Earth S tation Antenna requires qualified and experienced personnel. Andrew installation, operation, and main- tenance instructions are illustrated for such personnel. Additionally , the antenna should be inspected by qualified personnel to verify proper installation,[...]

R ecommended T ools 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 r[...]

Par ts V erification R e por ting Equipment Loss or Damage R e por ting Visible Loss or Damage R e por ting Concealed Damage Inv entor y Equipment R eceiv ed Upon receipt of your order , the shipment should be verified to ensure that all parts have reached your site. This process should occur before the inst allation process begins. Andrew Corporat[...]

R etur ning Equipment Ste p 1 Ste p 2 Ste p 3 Ste p 4 Ste p 5 Andrew Corporation tries to ensure that all items arrive safe and in working order . Occasionally , despite these effort s, equipment is received which is not in working condi- tion. When this occurs, and it is necessary to return the equipment to Andrew Corporation for either repair or [...]

Installation Sequence Checklist Site Pre paration Ground Mount Assembly For MPK T ypes Only The 3.7-Meter Earth S tation Antenna requires the installation team to perform the assembly in the sequence presented below . Moreover , this sequence should be reviewed to ensure a smooth installation. Use the following checklist to verify and/or determine [...]

For MPJK T ypes Only Main R eflector Assembly  Mount azimuth pivot assembly to ground mount assembly  Bolt one jack to azimuth pivot assembly  Unscrew jack  T ighten galvanized hardware using A-325 tensioning procedure  Lubricate jackscrews  Pull protective boot over jackscrew  Bolt elevation pivot assembly brackets to ground m[...]

Enclosure Assembly R eflector-T o- Mount Assembly  Add reflector-mounting ring  Mount front and back hub-mounting rings  Apply sealant to outside of reflector-mounting ring  Perform recommended string test  Remove rear and side covers from enclosure assembly  Attach enclosure to mounting ring  Apply sealant backing rod around e[...]

Subreflector Feed System  Preassemble subreflector weldment  Attach subreflector-mounting ring to strut assembly  Attach angle clip s  Attach subreflector to reflector  Adjust subreflector  T ighten adjustment hardware  Refer to installation instructions p ackaged with the individual feed systems 13 Getting Star ted[...]

Ov er view Founda tion Pre paration 14 Installation Procedures This section provides installation procedures for the 3.7-Meter Andrew Earth S tation Antenna. The inst allation procedures include instructions on the following antenna com- ponents: • Mount • Reflector • Enclosure • Reflector-to-Mount Assembly • Subreflector • Feed System [...]

A-325 T ensioning Ste p 1 Ste p 2 Ste p 3 Ste p 4 Ste p 5 Ste p 6 15 During the installation process, there are several references to the A-325 hardware ten- sioning procedure. The A-325 hardware must be properly tensioned to avoid slippage between bolted surfaces under high loads. Slippage can cause the corresponding assembly to move, causing ante[...]

Mount Unpacking Assembly (Using a Crane) 16 The elevation/azimuth mount design simplifies installation, minimizes foundation require- ments, and enables horizon-to-horizon coverage from any worldwide location. The ground mount assembly enables 180 degree positioning for selected azimuth viewing. Azimuth range coverage is plus or minus 90 degrees, d[...]

Ste p 1 Ste p 2 Ste p 3 Ste p 4 17 Carefully remove the ground mount assembly (P/N 208800 - motorizable or P/N 202680-2 manual) from the packing crate. Leave the steel strapping int act to avoid dis- engagement of the panning frame from the square-tube weldment during the ground mount installation. Securely attach the crane to the ground mount asse[...]

Ste p 5 Ste p 6 Ste p 7 18 Attach the ground mount assembly to the eight corresponding anchor bolt s using a 3/4 inch flat washer and 2-3/4 inch hex nuts as shown in Figure 3-4a. One 3/4 inch hex nut is supplied with the anchor bolt kit and the second 3/4 inch hex nut is supplied with the antenna. Installation Procedures Figure 3-4a: Ground Mount A[...]

Assembly (Without a Cr ane) Ste p 1 Ste p 2 19 As stated earlier , Andrew recommends the use of a crane during this installation process; however , we recognize that a crane may not always be available. If a crane is not available, the following steps provide the procedure for inst alling the ground mount assembly without a crane. Carefully remove [...]

Ste p 3 20 Lift the ground mount assembly into an upright position. In the absence of a crane, it is recommended that a minimum of two people assist in the lifting of the mount assembly as shown in Figure 3-6a and Figure 3-6b. Installation Procedures Figure 3-6a: Manual Lift Figure 3-6b: Manual Lift[...]

Ste p 4 Ste p 5 Ste p 6 21 Figure 3-7: Mount Alignment/Adjustment NOTE: Y ou may need to adjust the mount when lifting it to ensure that the anchor bolts are aligned directly underneath the base of the ground mount assembly as shown in Figure 3-7. Attach the ground mount assembly to the eight corresponding anchor bolt s using a 3/4 inch flat washer[...]

Motorizable P edestal Ground Mount Assembly Ste p 1 Ste p 2 Ste p 3 Ste p 4 22 Installation Procedures The ground mount assembly enables 180° positioning for selected azimuth viewing. Azimuth range coverage is ±90° divided into three 120° continuous ranges with 30° overlap. Elevation adjustment is continuous from 0 to 90°. Position and mount [...]

23 Installation Procedures 1/2” Flat W asher 1/2 x 1-3/4” Bolt and Nut Universal T erminal 5/16 x 3/4” Hex Head Screw and Lock W asher Grounding Cable Figure 3-8d: Ground Mount Assembly T iller Arm Hardware Figure 3-8e: Ground Mount Assembly T iller Arm Hardware Left Position -90° T o +30° Right Position -30° T o +90° Center Position -60?[...]

Manual P edestal Ground Mount Assembly Ste p 1 Ste p 2 24 Prepare the ground mount hardware in the mount hardware kit by sorting all bolt s, nuts, and flat washers into separate sections as shown in Figure 3-9. Installation Procedures Figure 3-9: Hardware Separation W ax two sides of each galvanized bolt with the stick wax provided. This allows a s[...]

Ste p 3 Ste p 4 25 Position and mount the azimuth tiller arm (P/N 2031 12) to the tiller-arm bracket on the left side (facing the satellite) of the ground mount assembly . This mounting position of the azimuth tiller arm is dependent upon pre-determined azimuth range requirements as shown in Figure 3-1 1. NOTE: The ground mount assembly enables 180[...]

Ste p 5 26 Figure 3-12: Azimuth T iller Arm - Final Assembly Locate the elevation and azimuth struts (P/N 202951-2-manual) as shown in Figure 3-13. NOTE: The azimuth strut is the strut on the right and the elevation strut is on the left. Installation Procedures Figure 3-13: Elevation and Azimuth S truts An illustration of the final azimuth tiller a[...]

Ste p 6 Ste p 7 Ste p 8 27 Installation Procedures Insert pivot blocks (P/N 205876) onto the end of the azimuth strut using lubricated 1/2 inch bolt, flatwasher and hex nut as shown in Figure 3-14. A 3/4 inch flat washer should be inserted between the strut and the spacer block. T ighten hardware according to the A-325 tensioning procedure. Figure [...]

Ste p 9 28 Installation Procedures Figure 3-16: Azimuth Pivot Assembly Mount the azimuth strut to each bracket on the ground mount assembly as shown in Figure 3-17a and Figure 3-17b. The front and rear bracket s should be aligned as shown in Figure 3-18. Figure 3-17a: Azimuth S trut Assembly - Front[...]

29 Installation Procedures Figure 3-17b: Azimuth S trut Assembly - Rear Figure 3-18 illustrates a final azimuth strut assembly mounted to the ground mount assembly . Figure 3-18: Azimuth S trut Assembly - Final Assembly[...]

Ste p 10 Ste p 11 30 Installation Procedures Figure 3-19: Elevation S trut Pick Up Assembly (T op View) Bolt the elevation bracket-support plates (P/N 205873) to the elevation strut tube assem- bly using 5/8 inch hardware (hex bolt, flatwasher and nut)as shown in Figure 3-20. Figure 3-20: Bracket-Support Plates (T op View) The next step is to insta[...]

Ste p 12 31 Installation Procedures The elevation strut tube assembly should now be bolted to the elevation strut bracket as shown in Figure 3-21a and Figure 3-21b. Figure 3-21a: Elevation S trut Bracket Figure 3-21b: Elevation S trut Bracket[...]

Manual Actua tor Assembly Ste p 1 Ste p 2 Ste p 3 32 Installation Procedures The manual actuator assembly (P/N 207882) is used to adjust the elevation and azimuth angles of the 3.7 meter antenna. The following step s provide the procedure used to assemble and install the manual actuator assembly . Loosely attach the manual actuator assembly (P/N 20[...]

Ste p 4 Ste p 5 Ste p 6 Ste p 7 Manual Actua tor Assembly R emo val Ste p 1 Ste p 2 Ste p 3 Motorizable P edestal Ground Mount Assembly Ste p 1 33 Installation Procedures Remove the two indicated strut-support setscrews, and att ach the base angle to the cor- responding strut support using the supplied 1/2 inch clamping nuts and the previously remo[...]

Ste p 2 Ste p 3 34 Installation Procedures Bolt one jack to the azimuth pivot assembly using 5/8 inch hardware (hex bolt, flatwash- er and hex nut) as shown in Figure 3-24. Figure 3-24: Jack Attachment Unscrew the jack using a spud wrench until it meets with the front azimuth strut weld- ment as shown in Figure 3-25a. Figure 3-25a: Jack Unscrew Pro[...]

Ste p 4 Ste p 5 Ste p 6 Ste p 7 35 Installation Procedures Figure 3-25b: Azimuth Jack Attachment T ighten the hardware using the A-325 tensioning procedure. Lubricate the jackscrews according to the maintenance instructions. Pull the protective boot over the jackscrew , and clamp at the end as shown in Figure 3-26. Note: Position condensation drain[...]

Ste p 8 Ste p 9 36 Installation Procedures Bolt the elevation pivot assembly brackets (P/N 208370 - lef t and P/N 208371 - right) to the inside of the ground mount assembly as shown in Figure 3-27. Figure 3-27: Elevation Pivot Bracket Assembly Bolt the jack to the elevation pivot assembly using 5/8 inch hardware (hex bolts, flat- washers and nuts) [...]

Ste p 10 Ste p 11 Ste p 12 Ste p 13 Ste p 14 37 Installation Procedures Figure 3-28b: Elevation Jack Loosen the clamp on the jack boot. Unscrew the jack by using a spud wrench until the jack connects to the back of the enclosure as shown in Figure 3-28c. Figure 3-28c: Elevation Jack Extension T ighten the hardware using the A-325 tensioning procedu[...]

Embedded Pipe Ground Mount Assembly Ste p 1 38 Installation Procedures Refer to Figure 3-29a for an overall view of the assembled embedded pipe ground mount assembly , reflector and subreflector assemblies. Figure 3-29a: T ypical Embedded Pipe Mount Earth S tation Antenna Attach the 104320 lef t side frame, to the 168 tube using four 104326 U-bolts[...]

Ste p 2 Ele v ation/Azimuth Strut Assembl y Ste p 3 39 Installation Procedures Attach the 104319 front frame to the lef t side frame as shown in Figure 3-29c. Attach the 104325 braces to the left side by means of the U-bolt s. Attach the right side frame and braces to the front frame and the right side frame to the left side frame, also shown. For [...]

Ste p 4 40 Installation Procedures Attach the elevation strut to the top of the rear frame assembly as shown in Figure 3-29e using the 100537-15 M20 x 50 bolt, 100526-57 nut and 100521-57 flatwasher . T ighten bolts to 185 N•m. (136 lbs-f t). Figure 3-29e: Elevation S trut Attachment Attach 301917 elevation axis weldment to the front of the frame[...]

Ste p 5 Ste p 6 41 Installation Procedures Attach the azimuth strut to the bottom rear of the frame assembly as shown in Figure 3- 29g, using the 100537-15 M20 x 50 long bolt, 100526-57 nut, 100521-57 flatwasher and 100522-57 lockwasher . Attach the strut to the foundation anchor , as shown in Figure 3-29g. Install 301931 pointer where shown in Fig[...]

Ste p 7 42 Installation Procedures Install fine az. adjustment, att ach 40188-3 thread rod to 49712-3 bracket with 9999-167 .75-10 nuts and 9997-166 flatwasher . Slide threaded rod through welded tab and fasten using 9999-167 .75-10 nuts and 9997-166 flatwasher . Note: It will be necessary to tem- porarily remove one square head bolt for fine adjus[...]

R eflector Unpacking Ste p 1 Ste p 2 43 Installation Procedures The ground mount assembly is now completed with the necessary operational essen- tials. All ground mount options (such as motors) have separate instructional bulletins located in the part s kit that contains the option. The next step in the installation process is the reflector assembl[...]

Ste p 3 Ste p 4 Ste p 5 Ste p 6 44 Installation Procedures Figure 3-30b: Export Pack Figure 3-30c: Unpacking Pry the short ends of the crate off by using a pry bar and hammer as shown in Figure 3-30c. NOTE: Notice that the part s of your order are boxed and banded to your crate. Remove these boxes by snipping the banding with tin snips. T ake the f[...]

Ste p 7 Ste p 8 Ste p 9 Ste p 10 Assembly Ste p 1 Ste p 2 45 Installation Procedures Lay the first half of the reflector (which has the flash located at twelve o’clock) face down on the blocks of wood. Lay the second half of the reflector face down on the blocks of wood. Unbolt the mounting ring from the crate, and set with the rest of the part s[...]

Ste p 3 Ste p 4 46 Installation Procedures Insert all of the joint-plate bolts, except for the socket-head shoulder bolt s. All bolts should be inserted from the same direction using a 5/16 inch hardware—flat washer under a lock washer and nut. DO NOT TIGHTEN. Note: DO NOT force bolt s—manipulate reflector halves to allow free insertion. At bot[...]

Ste p 5 47 Installation Procedures Figure 3-33a: Alignment Bolt Insertions Figure 3-33b: Alignment Bolt Insertions Add the alignment hex bolts to the end holes of the joint plates as shown in Figure 3- 33a (outside and inside of plate) to ensure that it is evenly aligned; and use hex bolt s to fill the rest of the joint plates as shown in Figure 3-[...]

Ste p 6 48 Installation Procedures Figure 3-33d: Alignment Bolt Insertions T ighten the hardware if the seam is correct starting from the center and working towards the outside of the reflector . Before tightening hardware, verify that the reflector seam gap is even along its length. Push from both directions of the seam if necessary . NOTE: The in[...]

Ste p 7 49 Installation Procedures Add the reflector-mounting ring to the assembled reflector . Notice that the notches in the mounting ring fit over the reflector seam indicating where the mounting ring should be placed. There is also a red stripe placed on the mounting ring. This red stripe must be aligned with the red stripe on the reflector as [...]

Ste p 8 Ste p 9 50 Installation Procedures Mount the front (P/N 202790) and back hub-mounting ring (P/N 49965) to the reflector with the appropriate hardware as shown in Figures 3-35a and b. NOTE: These components are included as p art of P/N 206319 Feed Hardware Kit. For K-Band Antennas, these components are included as part of P/N 301544 Feed Har[...]

Alignment T est Ste p 1 Ste p 2 Ste p 3 Ste p 4 51 Installation Procedures Reposition the first string above the second string to check the accuracy of the first test. NOTE: The reflector should be facing downward when the string test is performed. The person that is positioned under the dish should ensure that the strings are aligned cor- rectly d[...]

Enclosure (P edestal Mount Only) Ste p 1 52 Installation Procedures The enclosure (P/N 202934A) assembly attaches to the rear of the reflector . The enclo- sure provides weather protection for RF equipment and can accommodate up to a 4- port combiner network. An example of the assembled enclosure is presented in Figure 3-38a and Figure 3-38b. Figur[...]

Ste p 2 53 Installation Procedures Raise the enclosure assembly , and attach to the mounting ring on the reflector using the appropriate hardware as shown in Figure 3-39a and Figure 3-39b. Figure 3-39a: Enclosure Hardware Figure 3-39b: Enclosure Hardware VER Y IMPORT ANT[...]

Ste p 3 Ste p 4 Ste p 5 54 Installation Procedures Install the supplied sealant backing rod material around entire circumference of the mounting ring/enclosure mating surfaces as shown in Figure 3-40. Figure 3-40: Backing Rod Assembly Securely tighten the enclosure mounting hardware using the A-325 tensioning proce- dure. Apply the supplied RTV sea[...]

R eflector-to-Mount Assembly Using a Crane Ste p 1 Ste p 2 55 Installation Procedures The reflector can be installed on the mount manually or by using a crane. However , Andrew recommends that this procedure be performed using a crane. The following steps provide the procedure for inst alling the reflector to the mount using a crane. Route a sling [...]

Ste p 3 Ste p 4 Ste p 5 56 Installation Procedures V erify that all hoist assembly hardware is fully in tact before lifting the reflector to avoid personal injury or damage to the reflector . Route the crane’s cable and hook from the hoist over the slings, and att ach the shack- le’s hook to the crane’ s hook for raising the reflector . Posit[...]

Without a Cr ane Ste p 1 Ste p 2 57 Installation Procedures Figure 3-44c: Crane Lift The following steps provide the procedure for inst alling the reflector to the mount with- out the use of a crane. Route one rope tag line through two consecutive holes at the top of the reflector in the torsion box assembly . Place foam blocks (provided as packagi[...]

Ste p 3 Ste p 4 58 Installation Procedures Figure 3-45: Manual Lift of the Reflector to the Mount Position one person (of the three) on the mount to guide the reflector to the mount. Refer to Figure 3-46. Figure 3-46: Reflector to Mount Position three people at the top of the reflector to lift the reflector on it s end, facing for- ward as shown in[...]

Ste p 5 Ste p 6 59 Installation Procedures Align the enclosure bracket to the ground mount assembly . The lef t bolt should be inserted to hold reflector in place using 3/4” A-325 hardware (hex bolt, flatwasher and nuts as shown in Figure 3-47 and Figure 3-48. Figure 3-47: Enclosure Bracket Have the two people on the ground rotate the reflector t[...]

Ste p 7 Ste p 8 Ste p 9 Ste p 10 60 Installation Procedures Figure 3-49: Elevation Jack/Enclosure Attachment T ighten the hardware using the A-325 tensioning procedure. Carefully raise the reflector/enclosure assembly to the zenith (elevation = 90 degrees) position, and securely tighten the strut-support setscrews to 40 foot-pounds. Remove all hois[...]

61 Installation Procedures Figure 3-50a: Reflector to Mount The Reflector-to-Mount components can be verified and/or clarified in the following diagram.[...]

Y ou have now completed the attachment of the reflector to the ground mount assembly . Proceed to the instructions on assembling and attaching the subreflector to the reflector . 62 Installation Procedures R eflector-to-Mount Assembly Embedded Pipe Ground Mount Ste p 1 Lift the reflector carefully onto the mount as shown in Figure 3-50b. Secure the[...]

Subreflector Ste p 1 63 Installation Procedures Once the reflector has been assembled to the mount, the subreflector must be installed. Figure 3-51 presents a final subreflector assembly . Figure 3-51: Installed Subreflector The following steps provide the procedure for assembling the subreflector . Loosely preassemble the subreflector strut weldme[...]

Ste p 2 64 Installation Procedures Position and attach the subreflector-mounting ring (p art of 205929 subreflector assem- bly) to the corresponding mounting holes in the strut-support plates using 3/8 inch by 1 inch bolts, oversized flat washers, lock washers, and nut s as shown in Figure 3-53a and Figure 3-53b. NOTE: Ensure that one subreflector [...]

Ste p 3 65 Installation Procedures Figure 3-53b: Subreflector Assembly Attach the angle clip s (P/N 49187) around the reflector perimeter at the indicated posi- tions using the appropriate hardware as noted in Figure 3-53c. Figure 3-53c: Subreflector Assembly[...]

Raise and attach the preassembled subreflector strut assemblies between the corre- sponding angle clips using a t ag line as shown in Figure 3-54a. The angle clips should correspond with the holes in the reflector . NOTE: Ensure that one subreflector adjustment stud is located at the six o’clock position. Ste p 4 66 Installation Procedures Figure[...]

67 Installation Procedures Subreflector Struts Embedded Pipe Ground Mount Assembly Ste p 1 Ste p 2 Ste p 3 Ste p 4 Loosely preassemble the 300056 Subreflector S truts using supplied 222888 strut sup- ports and the 9963-127 3/8 inch by 2 1/4 inch bolt s, 9974-63 lockwashers, and 9999-60 nuts as shown in Figure 3-54b, V iew A. Note: At this time it i[...]

Subreflector Adjustment Ste p 1 Ste p 2 Ste p 3 Ste p 4 Ste p 5 68 Installation Procedures After the subreflector assembly has been att ached to the reflector , the subreflector must be adjusted to ensure correct alignment. The following step s provide the procedure for adjusting the subreflector . Position the supplied setting bar (P/N 203896 Ku-b[...]

Ste p 6 Ste p 7 Ste p 8 69 Installation Procedures Repeat the entire procedure until all four noted positions indicate that the subreflector aperture is set parallel to the ring (P/N 202790) as shown in Figure 3-56. T emporarily tighten the adjustment hardware until after step 10 has been completed. Figure 3-56: Subreflector Alignment Measure and n[...]

Ste p 9 Ste p 10 Ste p 11 Feed System 70 Installation Procedures Obtain the corresponding measurement s from the remaining subreflector struts, and adjust the subreflector mounting hardware (4 places) to achieve a maximum differential of 1/16 inch. Repeat the adjustment procedure performed in S teps 1-4, until all areas of the subre- flector are un[...]

Ov er view Acquiring A Satellite Ste p 1 Ste p 2 Ste p 3 Ste p 4 Ste p 5 Ste p 6 Ste p 7 71 Operation After you have completed the assembly of your antenna, you are now ready to become operational. In order to operate the earth station antenna, you will need to direct it to the desired satellite adjusting both the elevation and azimuth angles appro[...]

72 Figure 4-1: Pure Noise Signal on S pectrum Analyzer Figure 4-2: Minimum transponder Signal on S pectrum Analyzer Operation[...]

Ste p 1 Ste p 2 Ste p 3 Ste p 4 73 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 [...]

Ste p 5 Ste p 6 Ste p 7 Ste p 8 74 If the signal amplitude diminishes and does not increase (position B) to the level noted when the antenna was peaked on the side lobe, the antenna is moving away from the main beam; reverse the direction of the antenna movement. From the original side lobe position (position A), the signal amplitude should now dim[...]

Ste p 9 75 With all 24 transponder signals of approximately equal amplitude appearing on the spectrum analyzer screen determine the specific antenna system and satellite parame- ters. Rotate the feed assembly as required until the appropriate (odd or even) transpon- der signals are maximized. Figure 4-5: Maximizing Odd T ransponders Figure 4-6: Opt[...]

Manual Actua tor Assembly R emo val Ste p 1 Ste p 2 Ste p 3 Embedded Pipe Ground Mount Ele v ation Adjustment Ste p 1 Ste p 2 Azimuth Adjustment Ste p 1 Conclusion 76 After you have successfully acquired the satellite and all adjustment s have been made, the manual actuator should be removed. The following step s provide the procedure for the prop-[...]

Subreflector Adjustment 77 Operation After the satellite has been acquired and testing has t aken place with the spectrum analyzer , the subreflector may need to be adjusted to maximize optimum performance of your anten- na. The following procedures should be followed if a subreflector adjustment is required to maximize optimum performance. NOTE: A[...]

Ov er view General Cleaning Electrical Par ts 78 Prev entiv e Maintenance This section contains periodic preventive maintenance instructions for the 3.7-Meter Earth S tation Antenna. Included in this section are inspection and preventive mainte- nance procedures including cleaning and lubrication, painting, and an operational volt- age/current chec[...]

Mechanical P ar ts Inspection Local Control/Motor Driv e Controller 79 Clean mechanical part s 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 com- pressed air at 25 to 40 psi. Any accumulated imbedded dirt, corrosion, grease, or oil deposi[...]

Antenna 80 • Check transformer for an excessive wax deposit on the surface, discoloration, or a pungent odor indicative of burning vanish denoting overheating or a total breakdown. • Check all terminal boards for broken or missing terminals and stripped threads. Check tightness of lead attaching hardware. • Check each starter for a make-af te[...]

81 • Operate the azimuth and elevation drives as well as the feed rotation in both the plus and minus direction from the local control/motor drive controller at least once every three months during antenna down time. Check the mechanical limit switches provided at the end points stop antenna and feed movement, and limit travel to prevent structur[...]

Driv e System V olta g e and Cur rent Checks Ste p 1 Ste p 2 Ste p 3 82 • Check security of antenna mounting and interconnecting assembly hardware. Be cer- tain all electrical grounding connections (including cross-axis grounding strap s) are intact and secure, not corroded or broken. Thoroughly clean any noticeable corroded portions of grounding[...]

Ste p 4 Ste p 5 Ste p 6 Ste p 7 Ste p 8 Ste p 9 P edestal Mount Bearing Pad Adjustment Ste p 1 Ste p 2 Ste p 3 Ste p 4 Ste p 5 83 Repeat preceding step (3) with the FEED CCW/OFF/CW switch in the alternate operat- ing position. T urn the AZIMUTH EAST/WEST switch to either position and while the antenna is rotat- ing, carefully use a clamp on ammeter[...]

Preser v ation of Component Par ts Aluminum P ar ts Galv anized Surfaces Lubrication 84 When preserving the component part s, 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[...]

J ackscrews/Motors Gear Motor/Housing Fill Drain R equirements 85 remove any old lubricant to prevent an excessive build-up. Remove indicated access plugs from square tube weldment and apply lubricant to panning frame tube assembly and corresponding thrust pads. Securely replace access plugs in square tube weldment. Be certain to remove any protect[...]

86 Lube Service Lube Quantity Andrew Point Parts to be Lubricated Action Frequency T ype T ype /Points Number 1 Elevation jackscrew housing Lubricate Every 3 Pressure SHC32 1 49208 months Fitting 2 Elevation gear motor housing Inspect Monthly Pipe Plugs SHC624 10 ounces 47497 fill and drain Change Every 3 months 3 Azimuth jackscrew housing Lubricat[...]