Andrew 3.7-Meter Earth Station Antenna Installation And Operation Manual Download Page 38 | Manualshive

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Embedded Pipe

Ground Mount

Assembly

Step 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: Typical Embedded Pipe Mount Earth Station Antenna

Attach the 104320 left side frame, to the 168 tube using four 104326 U-bolts, 100526-51
M16 nuts and 100522-51 lockwashers. Add an 100536-21 M16 X 40 long bolt, 100526-
51 nut and two 100522-51 lockwashers at the top of the tube, as shown in Figure 3-
29b. Arrange this bolt so that a flat rests on the top of the tube.

Figure 3-29b: Left Side Frame Attachment

Ground Mount

Assembly

Reflector

Assembly

Subreflector

Assembly

104320

Left Side Frame

M16

Bolt, Lockwashers (2)

and Nut

104326

U-Bolt

M16

Nut

M16

Lockwasher

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Summary of Contents for 3.7-Meter Earth Station Antenna

Page 1: ... 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 Copyright 2000 by Andrew Corporation Installation Operation and Maintenance Bulletin OM37 Type ES37 3 7 Meter ESA 3 7 Meter Earth Station Antenna Revision C ...

Page 2: ...edestal Ground Mount Assembly 24 Manual Actuator Assembly 32 Manual Actuator Assembly Removal 33 Motorizable Pedestal Ground Mount Assembly 33 Embedded Pipe Ground Mount Assembly 38 Elevation Azimuth Strut Assembly 39 Reflector 43 Unpacking 43 Assembly 45 Alignment Test 51 Enclosure Pedestal Mount Only 52 Reflector to Mount Assembly 55 Using a Crane 55 Without a Crane 57 Reflector to Mount Assembl...

Page 3: ...he antenna type number The addition of the letter J within the antenna type number indicates that the mount includes azimuth elevation machine jackscrews instead of cor responding azimuth elevation strut assemblies The azimuth elevation jackscrews are equipped for integration with the optional motor drive systems A manual pedestal mount is also available It provides the same strong and versatile c...

Page 4: ...tenance practices All designs specifications and availabilities of products and services presented in this manual are subject to change without notice Copyright 1999 Andrew Corporation 4 Introduction 24 hour Technical Assistance For technical assistance call the following numbers at anytime Call From Call To Telephone Fax North America toll free U S A 1 800 255 1479 800 349 5444 Any Location U S A...

Page 5: ... divided into five distinct sections each dealing with a specific technical topic relating to either system or component subsystem information The sections con tained in this manual are described and listed under the following technical headings How to Use Describes the manual s purpose content and communication aids This Manual Additionally this section lists the related documentation for the 3 7...

Page 6: ...ennas may require persons to work at elevated work stations Whenever persons are working at eight or more feet above the ground and not on a guarded platform they should wear safety belts with at least one preferably two lan yards 3 Never stand underneath any object while it is being lifted 4 Always wear a hard hat especially if someone is above you 5 Make sure no person is in or under the reflect...

Page 7: ...oper installation of the 3 7 Meter Earth Station Antenna Tool Size Quantity Open End or Combination Wrenches 5 16 Inch 2 7 16 Inch 2 9 16 Inch 2 7 8 Inch 2 3 4 Inch 2 1 2 Inch 2 1 1 4 Inch 1 Crane 1 Ton Minimum Capacity extended end 1 Nylon Web Slings 2000 pound breaking strength 3 Inch by 14 Foot 2 Rope or Cord 2000 pound breaking strength 50 Foot 1 Shackles 5 8 Inch 2 Ladder 10 Foot Extension 1 ...

Page 8: ...dures when filing a claim with the carrier Make a note of any loss or evidence of external damage on the freight bill or receipt and have it signed by the carrier s agent Failure to adequately describe such external evidence of loss or damage may result in the carrier refusing to honor a damage claim The form required to file such a claim will be supplied by the carrier Concealed damage means dama...

Page 9: ...rence the sales order and purchase order as well as the date the equipment was received Pack the equipment in its original container with protective packing material If the origi nal container and packing material are no longer available pack the equipment in a sturdy corrugated box and cushion it with appropriate packing material Be sure to include the following information when returning the equ...

Page 10: ...idance in preparing location and installation of the 3 7 Meter Earth Station Antenna foundation Unpack ground mount assembly Attach ground mount assembly to foundation Organize ground mount hardware Wax galvanized hardware in hardware kit Tighten ground mount hardware to foundation Attach azimuth strut weldment to ground mount assembly Assemble azimuth strut Mount azimuth strut to ground mount ass...

Page 11: ...embly Bolt second jack to elevation pivot assembly Unscrew jack Tighten galvanized hardware using A 325 tensioning procedure Lubricate jackscrews Pull boot over jackscrew Remove protective covering from crate Pry top crate panel off Pry sides off crate Pry front off crate Unbolt reflector halves from bottom of crate Prepare assembly area with blocks of wood to assemble reflector Lay reflector halv...

Page 12: ...ng mating surfaces Apply RTV sealant Route sling through upper holes of torsion box assembly Route two rope tag lines through torsion box assembly to be used as guides Place foam blocks on ground to avoid scraping reflector when lifted Raise reflector Bolt left bolt of enclosure bracket Rotate reflector to align right bolt Extend elevation strut or jackscrew and attach to top of enclosure assembly...

Page 13: ...ldment Attach subreflector mounting ring to strut assembly Attach angle clips Attach subreflector to reflector Adjust subreflector Tighten adjustment hardware Refer to installation instructions packaged with the individual feed systems 13 Getting Started ...

Page 14: ...ems Before beginning the installation process on the ground mount assembly ensure that the foundation has been prepared Foundation specifications are provided by Andrew and may be used as a reference by civil engineering personnel when preparing the foundation for local soil conditions These specifications are available before the ship ment arrives by contacting the Customer Service Center Sweep f...

Page 15: ...complete tighten the bolts until the surfaces are joined and the nuts are snug for example full effort of a person using an ordinary spud wrench Do not proceed with Steps 5 and 6 unless the connection is final and is not intended to be loosened again Note If the bolts are loosened after Steps 5 and 6 discard and replace with new hard ware Using a felt tip marker mark the nuts and the ends of the b...

Page 16: ...s to 90 degrees After ensuring that the foundation has been properly prepared the ground mount assembly process may begin The pedestal ground mount assembly arrives in a packaged wooden crate as shown in Figure 3 2 below The mount can be positioned manually or by using a crane however Andrew recommends that this procedure be performed using a crane to ensure speed and ease of installation Installa...

Page 17: ...Raising Ground Mount Assembly Align the ground mount assembly directly over the anchor bolts P N 203314 manual or P N 203666 motorizable which should have been previously mounted in the foun dation pad NOTE Ground mount positioning on the foundation is dependent upon predetermined azimuth viewing requirements The ground mount assembly arm should be positioned opposite the satellite requirement If ...

Page 18: ...ed 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 Assembly Base Hardware Remove the steel strapping from the ground mount assembly Tighten the foundation hardware using the A 325 tensioning procedure Figure 3 4b shows the ground mount assembly attached to the foundation Figure 3 4b Ground Mount Assembly Base Ha...

Page 19: ...t of the panning frame from the square tube weldment during the ground mount installation Lay the ground mount assembly on its side in line with the anchor bolts P N 203314 manual or P N 203666 motorizable as shown in Figure 3 5 NOTE Ground mount positioning on the foundation is dependent upon predetermined azimuth viewing requirements The ground mount assembly panning frame arm should be opposite...

Page 20: ...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 ...

Page 21: ...sitioning on the foundation is dependent upon predetermined azimuth viewing requirements The ground mount assembly arm should be opposite the satellite requirement If your site is in the Northern hemisphere your satellite will be located in the South If your site is in the Southern hemisphere your satellite will be located in the North Remove the steel strapping from the ground mount assembly Tigh...

Page 22: ...rews in azimuth and 0 50 x 1 50 in set screws in elevation strut supports Position and mount 204754 elevation support angle assembly to ground mount as shown using 0 50 x 1 75 in A 325 bolts flat washers and nuts Tighten hardware per A 325 tensioning procedure Loosely install supplied 0 75 x 2 00 in A 325 bolts flat washers and nuts in elevation support angle assembly This hardware along with the ...

Page 23: ...nd Nut Universal Terminal 5 16 x 3 4 Hex Head Screw and Lock Washer Grounding Cable Figure 3 8d Ground Mount Assembly Tiller Arm Hardware Figure 3 8e Ground Mount Assembly Tiller Arm Hardware Left Position 90 To 30 Right Position 30 To 90 Center Position 60 To 60 ...

Page 24: ...by sorting all bolts nuts and flat washers into separate sections as shown in Figure 3 9 Installation Procedures Figure 3 9 Hardware Separation Wax two sides of each galvanized bolt with the stick wax provided This allows a smooth installation of each galvanized bolt as shown in Figure 3 10 Figure 3 10 Waxing Bolts ...

Page 25: ... azimuth range requirements as shown in Figure 3 11 NOTE The ground mount assembly enables 180 degrees positioning for selected azimuth viewing Azimuth range coverage is plus or minus 90 degrees divided into three 120 degree continuous ranges with a 30 degrees overlap Elevation adjustment is continuous from 0 degrees to 90 degrees Installation Procedures Figure 3 11 Azimuth Tiller Arm Tighten the ...

Page 26: ...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 Struts An illustration of the final azimuth tiller arm is shown in Figure 3 12 ...

Page 27: ...edure Figure 3 14 Azimuth Strut Assembly Slide the round strut assembly bracket P N 203875 on the end of the azimuth strut and hand tighten the1 2 inch setscrews before mounting it on the ground mount assem bly as shown in Figure 3 15 Figure 3 15 Azimuth Strut Bracket Assembly Mount the second azimuth support plate P N 205875 pivot assembly to the rear end of the ground mount assembly as shown in ...

Page 28: ... 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 brackets should be aligned as shown in Figure 3 18 Figure 3 17a Azimuth Strut Assembly Front ...

Page 29: ...nstallation Procedures Figure 3 17b Azimuth Strut Assembly Rear Figure 3 18 illustrates a final azimuth strut assembly mounted to the ground mount assembly Figure 3 18 Azimuth Strut Assembly Final Assembly ...

Page 30: ...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 Top View The next step is to install the elevation strut assembly Begin by bolting the elevation strut tube assembly P N 205872 to the ground mount assembly as shown in Figure 3 19 ...

Page 31: ...lation 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 Strut Bracket Figure 3 21b Elevation Strut Bracket ...

Page 32: ...ation strut as shown in Figure 3 22 using clamp segments 1 4 inch screw lockwasher and hex nut in each of the 12 connections NOTE The drain hole should be positioned downward for proper water drainage Attach the base angle to the actuator P N 202661 using 1 2 inch screws flatwashers and hex nuts as shown in Figure 3 22 AVOID EXCESSIVE TORQUE ON THE MOUNTING HARDWARE Ensure that the locking strut s...

Page 33: ... actuator assembly Remove the manual actuator assembly by first removing the hardware securing the actuator to the base angle NOTE The adjustment kit assembly should be removed after the antenna has been adjusted Store the manual actuator assembly and the corresponding hardware in a dry area for future use Remove the remaining clamp segments with the corresponding hardware After the antenna is poi...

Page 34: ...vot 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 Procedure ...

Page 35: ... 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 holes downward Figure 3 26 Protective Boot Attachment Place pivot blocks P N 205876 on both sides of the jackscrew ends bolting with lubri cated 1 2 inch hex bolt flatwasher and hex nut as shown in Figure 3 25b ...

Page 36: ...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 as shown in Figures 3 28a and 3 28b Figure 3 28a Elevation Jack ...

Page 37: ...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 Tighten the hardware using the A 325 tensioning procedure Lubricate the jackscrews using the maintenance procedures Pull the protective boot over the jackscrew and clamp it at the end as was performed with the azimuth jackscrew ...

Page 38: ...left side frame to the 168 tube using four 104326 U bolts 100526 51 M16 nuts and 100522 51 lockwashers Add an 100536 21 M16 X 40 long bolt 100526 51 nut and two 100522 51 lockwashers at the top of the tube as shown in Figure 3 29b Arrange this bolt so that a flat rests on the top of the tube Figure 3 29b Left Side Frame Attachment Ground Mount Assembly Reflector Assembly Subreflector Assembly 1043...

Page 39: ...00 strut bracket to 49258 strut support using 45980 1 625 11 x 2 long bolt and nut assembly Note Long bolt and nut assembly should not protrude inside diameter of 49258 strut support Assemble strut bracket strut support assembly to support pipe by sliding over strut with welded tab facing 104638 U bracket Snug the strut support in place using 9953 15 50 13 x 1 5 long square head screws in three pl...

Page 40: ...olts to 185 N m 136 lbs ft Figure 3 29e Elevation Strut Attachment Attach 301917 elevation axis weldment to the front of the frame assembly in two places using 100537 15 M20 x 50 long bolt 100526 57 nut and 100522 57 lockwasher as shown in Figure 3 29f Figure 3 29f Elevation Axis Weldment Attachment M20 x 50 Bolt Flatwasher Lockwasher and Nut M20 x 50 Bolt Lockwasher and Nut 301917 Elevation Axis ...

Page 41: ...then reinstalling with 100521 51 flatwasher and pointer Choose appropri ate 221027 azimuth label for antenna location Northern or Southern Hemisphere and attach to 11809 24 clamp Slide scale behind pipe and align with pointer and tighten See Figures 3 29g and 3 29h Figure 3 29g Azimuth Strut Pointer Attachment Figure 3 29h Azimuth Label Clamp M20 x 50 Bolt Flatwasher Lockwasher and Nut M20 Flatwas...

Page 42: ...olt for fine adjusting the threaded rod After fine adjustment it is recommended that the fine adjustment rod assembly remain in place If the threaded rod is removed the square head bolt must be replaced Attach 49712 3 bracket to strut using 9956 67 U bolt 9999 109 50 13 nut and 9974 4 lockwasher See Figure 3 29i Repeat for elevation strut Figure 3 29i Fine Azimuth Adjustment Attachment 49712 3 Bra...

Page 43: ...elow are provided for the split reflector style 3 7 Meter Earth Station Antenna If you are installing the full reflector style skip this section and proceed to Step 7 Upon receiving your 3 7 Meter Earth Station Antenna notice that it is delivered in a wooden crate and covered with a white nylon sheath The protective crate covering shields the product from being damaged during the shipment process ...

Page 44: ...anding with tin snips Take the front long side of the crate off Unbolt the reflector halves from the bottom of the crate DO NOT PRY Find a flat area for the reflector assembly The area must be large enough for the reflec tor halves to lay adjacent to each other Pieces of wood such as 2 X 4 pieces can be positioned to provide a level surface for the reflector to rest on which will prevent scratchin...

Page 45: ...can begin assembling your Andrew earth sta tion antenna The reflector halves are placed next to each other to begin the assembly The following steps provide the procedure for assembling the 3 7 Meter reflector Note Figure 3 33c provided at the end of this section shows a diagram of the reflector assembly Station an installer under the reflector halves to begin the assembly See that the joint plate...

Page 46: ... TIGHTEN Note DO NOT force bolts manipulate reflector halves to allow free insertion At both antenna seams loosely install three location bolts and nuts 5 16 inch hardware adjacent to the center hole as shown in Figure 3 32 NOTE The installer positioned under the reflector should insert the bolts from the underside while the second installer inserts the flat washers under lock washers and nuts fro...

Page 47: ...own in Figure 3 33a outside and inside of plate to ensure that it is evenly aligned and use hex bolts to fill the rest of the joint plates as shown in Figure 3 33b THESE MUST NOT BE DRI VEN BUT INSERTED BY HAND NOTE All bolts should be inserted from the same direction using a bolt flatwasher under a lockwasher and nut on joint plate and a bolt and locknut on the seam VERY IMPORTANT ...

Page 48: ...r positioned inside the reflector must hold the bolt head with a wrench while the nut on the outside is tightened Figure 3 33c Alignment Bolt Insertions Splice Strip and Mounting Ring Hardware Tapered M6 x 1 0 25 mm Location Bolts Washers for Mounting Ring Attachment Only and Lock Nuts Joint Plates Seal Seam All Around Ring Mounting Ring Tabs Red Line Match Marks Serial No On Joint Plates Serial N...

Page 49: ...ting 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 shown in Figure 3 34a When all bolts are inserted tighten in a clockwise sequence tabs on the mounting ring must be flush with the reflector as shown in Figure 3 34b Figure 3 34a Mounting Ring Placement Figure 3 34b Mounting Ring Placement ...

Page 50: ... Kit 2 Port or P N 301515 Feed Hardware Kit 4 Port Figure 3 35a Mounting and Center Rings Figure 3 35b Mounting and Center Rings 1 4 20 x 1 1 2 Bolts Flatwashers and Nuts 12 places For equipment enclosure versions only apply a smooth continuous bead of RTV sealant to the inside of the reflector mounting ring to seal the reflector and the mounting ring seam as shown in Figure 3 36 Figure 3 36 Mount...

Page 51: ...mbly Figure 3 37 Reflector Alignment As a final test of proper reflector alignment Andrew recommends that a string test be performed The following steps provide the procedure for the string test Attach a string at the twelve o clock position of the reflector stretching to the six o clock position of the reflector Attach a second string at the three o clock position stretching to the nine o clock p...

Page 52: ...p to a 4 port combiner network An example of the assembled enclosure is presented in Figure 3 38a and Figure 3 38b Figure 3 38a Enclosure Final Assembly Figure 3 38b Enclosure Final Assembly Before assembling the enclosure verify that the appropriate parts are present The fol lowing steps provide the procedure for the enclosure assembly Remove the rear covers and corresponding side panels from the...

Page 53: ...es 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 VERY IMPORTANT ...

Page 54: ...tighten the enclosure mounting hardware using the A 325 tensioning proce dure Apply the supplied RTV sealant around the outer perimeter of the reflector mounting ring enclosure assembly junction as shown in Figure 3 41 Figure 3 41 RTV Sealant You have now completed the assembly of the enclosure and have mounted the enclo sure to the reflector Proceed to the next page for instructions on mounting t...

Page 55: ...ng a crane Route a sling through the upper holes in the reflector torsion box assembly and connect the ends using a 5 8 inch shackle as shown in Figure 3 42 NOTE If using a steel sling install foam pad protection in the upper reflector torsion box holes under the sling to avoid disfiguration of the reflector Route two rope tag lines through two consecutive holes in the torsion box assembly to be u...

Page 56: ... the hoist over the slings and attach the shack le s hook to the crane s hook for raising the reflector Position a person at the end of each tag line to guide the reflector as it is being lifted and position another person on the mount to crank the hoist NOTE The crane s hook must be perfectly aligned with the top of the reflector s hook so that it can be lifted straight up Figure 3 44a Crane Lift...

Page 57: ...ctor 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 packaging material on the bottom lip of the reflector between the ground mount and the reflector to prevent the reflector from scraping the ground as it is lifted ...

Page 58: ...lector 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 its end facing for ward as shown in Figure 3 45 ...

Page 59: ...atwasher 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 to connect with the right bolt of the enclosure bracket against the ground mount angle bracket Facing the reflector the right bolt should be inserted to hold the reflector in place using the appropriate hard ware Figure 3 48 Enclosure Bracket Alignment ...

Page 60: ... 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 hoisting apparatus Extend the elevation strut or elevation jackscrew and attach it to the top rear of the enclosure assembly as shown in Figure 3 49 ...

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

Page 62: ...to Mount Assembly Embedded Pipe Ground Mount Step 1 Lift the reflector carefully onto the mount as shown in Figure 3 50b Secure the reflector to the mount using 100537 15 M20 x 50 long bolts 100526 57 nuts and 100522 57 lockwashers in three places Tighten these three to 38 N m Figure 3 50b Reflector to Mount M20 x 50 Bolt Lockwasher and Nut M20 x 50 Bolt Flatwasher Lockwasher and Nut Elevation Fin...

Page 63: ...reflector assembly Figure 3 51 Installed Subreflector The following steps provide the procedure for assembling the subreflector Loosely preassemble the subreflector strut weldment P N 202775 using the supplied strut angles P N 202776 and the 3 8 inch by 2 1 4 inch bolts lock washers and nuts as shown Figures 3 52a and 3 52b Figure 3 52a Subreflector Strut Assembly ...

Page 64: ...esponding mounting holes in the strut support plates using 3 8 inch by 1 inch bolts oversized flat washers lock washers and nuts as shown in Figure 3 53a and Figure 3 53b NOTE Ensure that one subreflector adjustment stud is located at the six o clock posi tion Figure 3 52b Subreflector Strut Assembly Figure 3 53a Subreflector Assembly ...

Page 65: ...ocedures Figure 3 53b Subreflector Assembly Attach the angle clips 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 ...

Page 66: ...onding angle clips using a tag 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 Step 4 66 Installation Procedures Figure 3 54a Subreflector Attachment ...

Page 67: ...49187angle clips around the reflector perimeter at the indicated positions using 100521 51 3 8 x 1 inch bolts 9974 63 lockwashers and 9999 60 nuts See View B in Figure 3 54b Figure 3 54b Subreflector Strut Attachment Raise and attach the pre assembled Subreflector strut assemblies between the corre sponding 49187 angle clips using a tag line Attach struts between angle clips using 9963 127 3 8 x 2...

Page 68: ...he outer edge of the front ring P N 202790 at the twelve o clock top position Sweep the bar across the corresponding subreflector edge and note the relative posi tion Repeat this procedure at the six o clock bottom position Use the noted position to indicate the required directional movement of the top portion of the subreflector aperture which is relative to the aperture bottom using the subrefle...

Page 69: ...te that the subreflector aperture is set parallel to the ring P N 202790 as shown in Figure 3 56 Temporarily tighten the adjustment hardware until after step 10 has been completed Figure 3 56 Subreflector Alignment Measure and note the distance between either outermost angle clip bolt head and the subreflector rim ...

Page 70: ...as of the subre flector are uniform Adjust the jam nuts and securely tighten the adjustment hardware Figure 3 57 Subreflector Alignment You have now completed the subreflector assembly By now you can see that your installation of the 3 7 Meter Earth Station Antenna is almost complete The feed system is the last phase of the base installation NOTE All antenna options such as feed sys tems motors an...

Page 71: ...roper water drainage Ensure that the locking strut support setscrew is firmly tightened on the strut assembly as shown in Figure 3 22 Remove the two indicated strut support setscrews and attach the base angle to the cor responding strut support using the supplied 1 2 inch clamping nuts and the previously removed strut support setscrews as shown in Figure 3 22 Securely tighten the remaining mountin...

Page 72: ...72 Figure 4 1 Pure Noise Signal on Spectrum Analyzer Figure 4 2 Minimum transponder Signal on Spectrum Analyzer Operation ...

Page 73: ...ansponder 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 a...

Page 74: ...ncreases deceases and then increases again but to a lesser value the antenna is moving in the wrong direction reverse the direction of the antenna move ment From the original null point the signal level should increase and decrease alter nately but with increasing amplitude until the transponder signal increases to a level of at least 30 dB at which time the main beam Continue to manually peak the...

Page 75: ... 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 Transponders Figure 4 6 Optimum Polarization Setting Operation ...

Page 76: ...elevation setscrews to 35 foot pounds Loosen the M20 elevation hinge bolts slightly If coarse adjustment i e more than 7 5 is required then loosen the three square head bolts and u bolt to threaded rod make adjustment then re tighten U bolt Fine adjustment is performed by working brass nuts on either side of bracket U bolt assembly to push or pull antenna Finally tighten the M20 elevation pivot bo...

Page 77: ...elobe requires adjust ment the bottom side of the subreflector should be adjusted downward by loosening the screws between the subreflector and the struts and adjusting the bottom side of the subre flector downward An easy way to remember this adjustment is through the acronym BOLD Bold Out Left Down Each of these adjustments should be repeated until each sidelobe is of equal distance from the pea...

Page 78: ... that all discrepancies have been corrected The following paragraphs describe the inspection and preventive maintenance proce dures for the earth station These instructions include general cleaning and inspection the preservation of metal parts and lubrication Periodic replacement of assemblies or components as a preventive measure is not required Malfunctions of the earth station can be traced to...

Page 79: ...cheduled inspection should be noted The discrepant condition should be corrected repaired or replaced immediately or at the conclusion of the inspection procedure Inspection of the local control motor drive controller conforms generally to standard visu al inspection procedures on electromechanical equipment In addition to these standard procedures perform the following checks and visual inspectio...

Page 80: ...cone rubber sealant to seal any exposed electrical fitting bolt hole or other possible water entry to the enclosed electrical components in order to maintain a waterproof condition Check or change humidity absorber Inspection of the antenna conforms generally to standard visual inspection procedures performed on electromechanical equipment In addition to these procedures perform the following chec...

Page 81: ...ion for cuts cracking abrasion and other deterioration Check the LNA or LNB s and the resolvers for a secure mechanical attachment Ensure proper torquing of polarization drive gear box setscrews and appropriate tensioning of corresponding drive chain assembly if applicable Check if applicable that the drain holes in the bottom of the enclosure are not obstructed and there is no evidence of water a...

Page 82: ... Approximately every three months and during a period of down time disconnect as applicable the RF transmitter and all power supplies The main disconnect switch in the main load center box at the antenna site must be in the ON position and the LOCAL REMOTE switch in the local control motor drive controller must be in the LOCAL position Open the outer local control motor drive controller door at th...

Page 83: ...he load side of the elevation drive motor circuit breaker Record the current draw in the equipment log and compare the readings to the reference values entered in the installation acceptance check off If the readings differ by more than five percent refer to appropriate troubleshooting information and perform applicable corrective action Then take voltage readings off each of the three conductors ...

Page 84: ...or pressurized spray If necessary thin the paint with the appropriate thinner to the proper consistency Thoroughly paint over the primed surfaces and blend with the existing painted surface Remove all loose paint and corrosion by scraping wire brushing or using steel wool Edges of existing paint can be blended with the metal surface by using a fine grit sand paper Wipe the surface to be painted wi...

Page 85: ... temperature range is 85 degrees to 300 degrees Fahrenheit 29 degrees to 149 degrees Celsius Periodically inspect lifting screws on jackscrew assemblies to ensure adequate lubrica tion Loosen Jackscrew boot clamps to expose the lifting screw assembly Fully extend jackscrew assembly being careful not to exceed preset mechanical limits Brush thin coating of Mobil SHC32 grease on exposed lifting scre...

Page 86: ...3 months 5 Panning frame tube assembly Lubricate Every 3 Brush Lightning Surface 207912 and thrust pads months On Lubricant Coverage Table 5 1 Antenna Lubrication Chart Inspection requires checking for visible signs of oil leakage draining replacing and adding oil to ensure appropriate oil level requirements Excessively dirty oil will require fresh oil replacement If oil leakage is found to be exc...

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