ASC4.5mCBand TripodMount FootingDetails 37675b-A

7/28/2019 ASC4.5mCBand TripodMount FootingDetails 37675b-A

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Installation Instructions

Type 49640-( )

Ground Mount Assemblyfor 4.5-Meter Earth Station Antennas

Bulletin 37675B

Telephone: 708/349-3300FAX (U.S.A.): 1-800/349-5444TELEX: 25-3897

Andrew Corporation10500 West 153rd StreetOrland Park, IL U.S. A. 60462

Customer Service, 24 hours: U.S.A. CanadaMexico: 1-800/255-1479U.K.: 0800 250055Republic of Ireland: 1 800 535358Other Europe: +44 592 782 612

Printed in U.S.A. 11/99Copyright 1999 by Andrew Corporation

Figure 1

1.0 Description1.1 Type 49640-( ) Ground Mount Assembly includes a49636 support angle kit, a 49634 azimuth axis support, a

49635 support and elevation pivot assembly, a 49639hardware kit, a 49767 azimuth strut, and a 49766 eleva-tion strut or 49779 high-look elevation strut.

1.2 The three-point ground mount is an elevation-over-

azimuth configuration optimized for geostationary satelliteapplications. The mount enables standard elevation

ranges from 2 - 62, and 33 - 90 with high-look strutconfiguration. Azimuth range is 82. Fine adjustment isprovided in both azimuth and elevation.

1.3The antenna ground mount is assembled using A-325

friction-type hardware. This construction eliminates slippageunder load conditions and the need for future retightening.

1.4 An optional earth station hoisting kit is available from

Andrew which eliminates the use of a crane for instal-lation.

READ THE INSTRUCTIONS THOROUGHLYBEFORE ASSEMBLY

2.0 Foundation Layout2.1 Refer to Figure 1 for foundation pad dimensions and

anchor plate orientation. Studs extend 3 inches (76 mm)above pads and are 3/4 in (19 mm) in diameter. Founda-

tion design should be reviewed with local civil engineerfor local soil condition.

2.2 Antenna can be used for two or more satellites ifazimuth degree separation between satellites is within

azimuth adjustment range of antenna. Foundation shouldbe installed at an azimuth angle which will accommodate

viewing satellites of interest. Calculations for determininghow to point the antenna are found in Section 6.

Revision A


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3.0 Ground Mount Assembly

3.1 Note: All references to left or right are as viewedfrom rear of mount assembly.

3.3 Refer to Figure 3. Attach 49624 support angles back-

to-back with 46560-2 spacers at mid-point betweenazimuth axis support and each corresponding rear

Figure 3

Figure 2

300747 300747

300747

3.2 Refer to Figure 2. Loosely attach 49634 azimuth axis

support and 300747 rear anchor pads to foundation padsusing 3/4-10 hex nuts and flat washers supplied with

47429 anchor bolt kit.

anchor pad using 1/2 in. bolts and nuts. Securely tighten

foundation pad hex nuts and add corresponding jamnuts. Note: Angles are attached edge down with flat ofangle facing upward.

2

300747

REAR ANCHORPAD


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3.4 Refer to Figure 4. Liberally apply 49208 grease to

bottom of 300746 lower azimuth axis joint assembly.

3.6 Refer to Figure 5. Remove temporary 1/2 in (13 mm)hex head bolts from elevation strut. Note required

elevation range (refer to Section 6) and set coarse strutlength based on procedure performed in paragraph 5.3.

Attach fine adjustment assembly based on procedureperformed in paragraph 5.8. Note: Mechanical means orfine adjustment assembly may be utilized to achieve

elevation angles greater than 30.

Figure 4

300746

3

3.5 Loosely attach 300746 lower azimuth axis joint

assembly to bottom portion of azimuth axis support usingtwo U-bolts and 1/2 in (13 mm) lockwashers and nuts.

3.7 Remove temporary 1/2 in (13 mm) hex bolt fromazimuth strut. Note required azimuth range (refer to

Section 6) and set coarse strut length based on proce-dure performed in paragraph 5.6. Attach fine adjustment

assembly based on procedure performed in paragraph5.9.


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Figure 5

4


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3.8 Refer to Figure 6. Loosely attach elevation strut

between plates on 300746 azimuth axis joint using 3/4 x3-1/2 in (89 mm) bolt, lockwasher and nut.

3.9 Refer to Figure 7. Loosely attach azimuth strut end

bracket to 49705 universal block using two 3/4 x 1-1/4 in

(32 mm) bolts, flatwashers and lockwashers. Loosely

attach universal block to appropriate rear anchor padbased on calculations performed in Section 6 to deter-

mine mounting configuration of azimuth strut. Use 3/4 x5-1/2 in (140 mm) bolt, lockwasher and nut.

Figure 6

5

Figure 7

300746AZIMUTH AXIS

JOINT


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3.10 Refer to Figure 8. Loosely attach 300748 upper

azimuth axis joint to top portion of azimuth axis support

6

using two U-bolts and 1/2 in (13 mm) lockwashers and

nuts.

300748AZIMUTH AXIS

JOINT

300746AZIMUTH AXIS

JOINT

300747REAR ANCHOR PAD

300747REAR ANCHOR PAD

Figure 8


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3.11 Refer to Figure 9. Loosely attach 49622 support

angIes to right and Ieft tabs on upper azimuth axis jointassembly using 1/2 in bolts, flatwashers and nuts. Note:

Angles are attached edge down with flat of angle facingupward.

7

3.12 Attach 49635 support and elevation pivot assembly

between previously installed 49622 support angles using1/2 in bolts, flatwashers, and nuts.

Figure 9

300748AZIMUTH AXIS

JOINT

300747AZIMUTH AXIS

JOINT

300747AZIMUTH AXIS

JOINT


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3.13 Refer to Figure 10. Loosely attach 49623 support

angles back-to-back with 46560-2 spacers at mid-pointsbetween right and left connection plates on 49635

support/elevation pivot assembly and 300746 azimuthaxis joint using 1/2 in bolts and nuts. Note: Angles are

attached edge in with flat of angle facing downward.

3.14 Loosely attach 49704 U-bracket to appropriate

connection plate on 49635 support/elevation pivot

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assembly based on mounting configuration of azimuth

strut using 1/2 in bolt, flatwasher, and nut.

3.15 Loosely attach remaining end of azimuth strutassembly to previously mounted U-bracket using 3/4 x 4-

1/2 in (114 mm) bolt, lockwasher and nut. Securelytighten all ground mount hardware per hardwaretensioning procedure.

Figure 10


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TENSIONING PROCEDURE

A-325 HARDWARE

A-325 hardware must be properly tensioned to avoid slippage between bolted surfaces under high loads. Slippagecan cause the mount assembly to move slightly and cause antenna misalignment. Make sure all bolts are tensioned

per procedure below and replace any bolts that break.

Proper Tensioning:

1. Insert bolt.

2. Lubricate bolt threads with stick wax to reduce friction.

3. Add nut and finger tighten.

4. After connections are completed, tighten bolts until surfaces are joined and nuts are snug, i.e., full effort of personusing ordinary spud wrench.

5. Mark nuts and ends of bolts with straight line. See A.

6. Tighten nuts further with extra long wrench or power wrench until nuts are moved 1/3 turn (120 30). See B.

9


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4.0 Reflector/Backstructure To Ground Mount Assembly

4.1 Note: Optional 49080 hoist kit must be assembled

prior to reflector/backstructure assembly hoisting. Hoistassembly should not be used for antenna elevation angle

adjustment. If hoisting kit is not utilized, reflector/backstructure assembly must be raised using crane orsome other mechanical means and continuing assembly

procedure at paragraph 4.11.

4.2 Refer to Figure 11. Install 49067 support tab assem-bly into top of 49634 azimuth axis support.

4.3 Loosely attach corresponding 49071 and 49072support assemblies using 49059 spacers and 45980-6

hardware. Note: Angles are installed edge down with flatof angles facing upward.

4.4 Install 49087 sheaves at each end between support

assemblies using 39527 pins with 9958-6 cotter pins.Securely tighten support assembly hardware.

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4.5 Attach entire support assembly to previously installed

49067 support tab assembly using 45980-6 hardware.

4.6 Loosely attach 49064 pick-up assemblies to 49635support and elevation pivot assembly as shown using

supplied U-bolts with 1/2 inch (13 mm) lockwashers andnuts. Note: Pick-up assemblies are mounted with slantedtabs facing outward.

4.7 Loosely attach 49061 supports to corresponding tabson 49071 and 49072 support assemblies using 45980-1hardware. Note: Angles are installed edge down with flat

of angles facing upward.

4.8 Loosely attach 49060 support and remaining ends of

49061 supports to corresponding 49064 pick-up assem-blies using 45980-1 hardware. Securely tighten all

mounting hardware. Note: Ensure entire hoist assemblyis centered on 49635 support and elevation pivot assem-

bly.

Figure 11


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4.9 Refer to Figure 12. Securely attach 39532 winch

assembly to lower portion of 49634 azimuth axis supportusing supplied U-bolts, lockwashers and nuts. Note:

Keep winch cable aligned with sheaves.

4.10 Begin releasing winch cable. Route cable throughboth 49087 sheaves allowing sufficient cable length toreach top of main triangle assembly on reflector

backstructure.

4.11 Route 43909 or customer-supplied 18-foot (5500mm) choker assembly behind both pivot brackets of main

Figure 12

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triangle assembly as shown. Attach end of choker to

winch or crane cable hook. Note: Distance betweenchoker/winch (or choker/crane) connection and top of

main triangle assembly should be approximately 13-inches (330 mm).

4.12 Remove small portion of foam padding from reflec-tor packing crate and install under bottom portion of

reflector assembly to prevent reflector damage during

hoisting procedure. Position man at bottom of reflector/backstructure to guide assembly during hoisting proce-dure.


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4.13 Refer to Figure 13. Hoist refIector/backstructure

assembly to verticaI position untiI upper joints of maintriangle assembly contact pipe and straddle two locator

bars on 49635 support and elevation pivot assembly.

4.14 Install two U-bolts at each pivot bracket of maintriangle assembly using 1/2-inch (13 mm) lockwashersand nuts. Note: Securely tighten U-bolts allowing for

4.16 Set fine elevation and azimith strut positions basedon procedure performed in paragraph 5.10. Note: If finealignment is not performed at this time, continue assem-

bly procedure at paragraph 4.17.

4.17 Securely tighten U-bolts and elevation strut mount-

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some reflector movement.

4.15 Raise lower portion of reflector/backstructure

assembly and attach remaining end of elevation strut toelevation axis bracket of main triangle assembly using

3/4 x 4-1/2 in (114 mm) bolt, lockwasher and nut. Note:Mechanical means or fine adjustment assembly may beutilized to achieve elevation angles greater than 30.

ing hardware.

4.18 Remove both fine adjustment assemblies and storein weather protected location for future use. Continue

with feed system and corresponding LNA installation.

Figure 13


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5.0 Elevation and Azimuth Adjustments

5.1 Proper antenna pointing requires specific coarse and

fine elevation and azimuth strut length adjustments whichcan be determined using the graphs provided in Section

6. Adjustable azimuth and elevation struts are initially setin coarse setting as near as possible to predeterminedlengths. Fine elevation and azimuth settings are accom-

plished with threaded rod on elevation and azimuth

struts.

CAUTION

Never loosen strut set screws and fine adjustmentassembly U-bolts simultaneously. Doing so mayresult in severe bodily harm and equipment damage.

5.2Coarse Elevation Adjustment. Station at least two

men at reflector rim to provide temporary reflectorsupport while third man loosens two U-bolts on each end

of 49635 elevation pivot assembly and removes 3/4 x 4-1/2-inch (114 mm) bolt, lockwasher and nut connectingelevation strut to bottom of main triangle assembly.

Carefully lower reflector to vertical position.

5.3 Refer to Figure 17. Determine required length ofelevation strut to nearest degree increment of desired

elevation setting. Adjust coarse elevation setting bywithdrawing secondary and, if necessary, tertiary strutsections from primary strut to achieve required strut

length. Install eight 1/2 in (13 mm) set screws in holesprovided and securely tighten. Note: Do not extend

secondary or tertiary strut sections into red warning

areas.

5.4 Carefully raise reflector and attach elevation strut tobottom of main triangle assembly using previously

removed 3/4 x 4-1/2 in (114 mm) bolt, lockwasher andnut. Note: Mechanical means or fine adjustment assem-bly may be used to achieve elevation angles greater than

30.

5.5 Coarse Azimuth Adjustment. Loosen two U-boltson both 49630 upper and 49629 lower azimuth axis

joints. Remove 3/4 x 4-1/2-inch (114 mm) bolt,lockwasher and nut connecting azimuth strut to 49704 U-bracket.

5.6 Refer to Figure 18. Determine required length of

azimuth strut to nearest degree increment of desiredazimuth setting. Adjust coarse azimuth setting by with-

drawing secondary strut section from primary strut toachieve required strut length. Install four 1/2 in (13 mm)set screws in holes provided and securely tighten. Note:

Do not extend secondary strut section into red warningarea.

5.7 Carefully pivot reflector as required and attach

azimuth strut to U-bracket, using previously removed 3/4x 4-1/2 inch (114 mm) bolt, lockwasher and nut. Note:Apply 49208 grease around bottom area of 49629 lower

azimuth axis joint assembly before changing azimuthposition of antenna.

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5.8 Fine Adjustment. Refer to Figure 14. Attach fine

adjustment assembly between adjacent elevation strutsections as shown using appropriate brackets, U-bolts,

brass hex nuts, flatwashers, and threaded rod. Securelytighten all adjustment assembly hardware. Note: Adjust-

ment assembly may also be attached in alternate positionshown depending on required elevation angle.

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5.9 Refer to Figure 15. Attach fine adjustment assembly

between adjacent azimuth strut sections as shown usingappropriate brackets, U bolts, brass hex nuts,

flatwashers, and threaded rod. Securely tighten alladjustment assembly hardware. Note: Fine adjustment

assembly on azimuth strut should be positioned awayfrom ground mount angles.

Figure 14

5.10 Set fine elevation and azimuth strut positions byloosening strut set screws and selected outer fine

adjustment hex nut. Turn corresponding inner hex nut inappropriate direction until required strut length isachieved. Securely tighten strut set screws and corre-

sponding outer hex nut.

5.11 During final electrical tuning, adjust elevation andazimuth struts appropriately to lengthen or shorten struts

for optimum signal strength.

5.12 After fine adjustments are complete, ensure strutset screws are securely tightened to 50-60 ft-lbs and

spray with zinc-rich paint. Securely tighten hex nuts andU-bolts on both elevation and azimuth fine adjustmentassemblies.

5.13 Securely tighten eight U-bolts on elevation pivot

assembly and upper and lower azimuth axis joints.

Figure 15


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6.0 Calculations for Antenna Pointing

6.1 The earth station antenna mount permits the antenna

to be pointed through an azimuth range of 82 withstandard elevation ranges from 2 - 62 and 33 - 90

with high-look strut configuration. The foundation must beoriented properly at each site to permit the antenna to bepointed at any satellite in the desired orbital arc. The

antenna has fine adjustment capability in both azimuth

and elevation which provides strut adjustment from thecoarse settings of the antenna. Refer to Figures 17 and18.

6.2 This section contains formulas and graphs fordetermining the pointing capabilities of the antenna.

Mount support pads permit attachment of azimuth strut inleft elevation axis, right rear pad position, right elevation

axis, right rear pad position, left elevation axis, left rearpad position, or right elevation axis, left rear pad position.

Refer to Figure 18. Additional azimuth strut positionsprovide greater flexibility when repositioning antenna toview other satellites of interest.

6.3 Formulas. Formulas for calculating true azimuth

(AZ), true elevation (EL), relative angle between trueazimuth and mount pointing angle (dAZ), and strut

lengths of Andrew earth station antennas are givenbelow. Knowing earth station latitude, longitude, azimuthsetting of mount (AZm) and satellite(s) longitude (over

the equator), the following calculations should be per-formed:

6.4 AZ = 180 + tan-1 (tan /)

= true azimuth with respect to earth. Note: This equation

applies to earth stations north of the equator. For earthstations south of the equator:

AZ = 360 - tan-1 (tan /sin ll where: = earth station latitude = relative longitude= satellite longitude minus earth station longitude

15

Note: Earth station latitude values are positive (+) for

sites located north of the equator and negative (-) forsites located south of the equator. Earth station longitude

values are positive (+) for sites west of Greenwich andnegative (- ) for sites located east of Greenwich.

6.5 dAZ = AZ - AZm = relative angle between trueazimuth angle and mount pointing direction.

where:

AZm = azimuth at which mount is set (nominalfoundation pointing angle). Refer to paragraph6.9.

6.6 EL = 90 - T - R = true elevation with respect to earthwhere:

R = cos-1 (cos cos ) andT = tan-1 (sin R/6.6166 - cos R

6.718266.38 - 16064.52 cos (EL + 9.04) = elevation

strut length

6.812774 - 65 + x2 + z2 = azimuth strut length

For azimuth strut attached from left elevation axis

pickup to right rear pad (as viewed from rear of an-tenna):

X = 43.201 + 56.331 cos(23.927 + dAZ) andZ = 84.978 + 56.331 sin (23.927 + dAZ)

For azimuth strut attached from right elevation axis

pickup to right rear pad (as viewed from rear of an-tenna):

X = 43.201 - 56.331 cos(23.927 - dAZ) andZ = 84.978 + 56.331 sin(23.927 - dAZ).

For azimuth strut attached from left elevation axispickup to left rear pad (as viewed from rear of antenna):

X = 43.201 - 56.331 cos(23.927 + dAZ) andZ = 84.978 + 56.331 sin(23.927 + dAZ)

For azimuth strut attached from right elevation axis

pickup to left rear pad (as viewed from rear of antenna):X = 43.201 + 56.331 cos(23.927 - dAZ) and

Z = 84.978 + 56.331 sin(23.927 - dAZ)


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6.9 Foundation Orientation. Generally, the foundation is oriented on a true North-South line. In the Northern Hemi-

sphere, the foundation would point due South, equivalent to the direction, AZ = 180. In the Southern Hemisphere,the foundation would point due North, equivalent to the direction, AZ = 0. Note: True North is not equivalent to

magnetic North.

6.10 Pointing Considerations. Knowing the foundation orientation (AZm), it is necessary to determine the coarseand fine settings of the mount struts to see a particular satellite within that orbital arc.

6.11 Using formulas in paragraphs 6.4 thru 6.6, calculate AZ, dAZ and EL for the satellite of interest. Figure 16 shows

these angles in relation to the antenna geometry.

6.12 Using Figure 17, determine elevation struth length knowing EL.

6.13 Using Figure 18, determine azimuth strut length knowing dAZ.

Figure 16

16


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17

Figure 17


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Figure 18

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Parts List

Type No. Description Quantity

49636 Support Angle Kit, consists of:

49624 Support Angle, Back 449623 Support Angle, Front 449622 Support Angle, Top 2

49639 Hardware Kit, consists of:300746 Az. Axis Joint, Bottom 1300748 Az. Axis Joint, Top 1

300747 Rear Pad 240188-3 3/4 - 10 x 10 in. Threaded Rod 249712 Bracket 1

49712-2 Bracket 29956-67 U-Bolt 1

9956-65 U-Bolt 29974-5 3/8-in. Lockwasher 6

9999-157 3/8 - 16 Hex Nut 69997-166 3/4-in. Flatwasher 109999-122 3/4 - 10 Hex Nut 5**

9963-703 3/4 - 10 x 3-1/2-in. Bolt 19963-452 3/4 - 10 x 4-1/2-in. Bolt 2

9963-706 3/4 - 1 0 x 5-1/2 in. Bolt 19974-10 3/4-in. Lockwasher 6

9978-173 1/2 - 13 Set Screws 139963-795 3/4 - 10 x 1-1 /4-in. Hex Bolt 249704 U-Bracket 1

49705 Universal Block 19956-101 U-Bolt 8

9974-4 1/2-in. Lockwasher 17**9999-109 1/2 - 13 Hex Nut 17**

33489 Zinc Paint 146560-2 Spacer 4

45980-9 1/2 - 13 Bolt and Nut Assy. 31*9999-167 3/4 - 10 Hex Nut, Brass 849208 Grease 1

9997-228 1/2-in. Flatwasher 10**9903-15 Set Screw Wrench 1

49634 Azimuth Axis Support 1

49635 Support and Elevation PivotAssembly - TOP 1

49766 Elevation Strut 1

49779 High-Look EL Strut 149767 Azimuth Strut 1

*This is an A-325 112 x 1-1/2" (38 mm) bolt and nut assembly.**Includes spare(s).

Optional Items

Type No. Description Quantity

47429 Anchor Bolt Kit, consists of:

47430 Anchor Bolt and Hardware Kit 12

49080 Hoist Kit, consists of:

49071 Support Assembly 1

49072 Support Assembly 149067 Support Tab Assembly 149087 Sheave 2

49059 Spacer 239527 Pin 249061 Support 2

43909 Choker Cable Assembly 149064 Pick-Up Assembly 2

49060 Support 19958-6 Cotter Pin 4

45980-6 Bolt Assembly 345980-1 Bolt Assembly 69956-101 U-Bolt 4

9999-109 1/2-13 Hex Nut 89974-4 1/2-in. Lockwasher 8

39532 Winch Assembly 149208 Grease 1

NoticeThe installation, maintenance or removal of antenna

systems requires qualified, experienced personnel.Andrew installation instructions have been written for

such installation personnel. Antenna systems should beinspected once a year by qualified personnel to verify

proper installation, maintenance and condition of equip-ment.

Andrew disclaims any liability for the results of improperor unsafe installation practices.

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ASC4.5mCBand TripodMount FootingDetails 37675b-A