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Andrew OM24SNG-RC manual

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  • Page 1

    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. 7/02 Copyr[...]

  • Page 2

    Introduction Description Maintenance Emergency Procedures Component R e placement Specifications Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Proprietary Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [...]

  • Page 3

    Pur pose Proprietar y Data Infor mation and Assistance Notice The purpose of this manual is to provide installation and preventive maintenance required to support the 2.4M SNG Antenna Assembly and Motor Drive System. This manual is subdivided into six sections to provide convenient reference for operator/ser- vice personnel requiring technical info[...]

  • Page 4

    T echnical Assistance 24-hour T echnical Assist ance For technical assistance, call the following numbers at anytime. Call From Call T o T elephone Fax North America (toll free) U. S. A. 1-(800)-255-1479 (800)-349-5444 Any Location U. S. A. (708)-349-3300 (708)-349-5410 (International) Customer Service Center The Andrew Customer Service Center give[...]

  • Page 5

    Safety Summar y The following general safety precautions are not related to any specific procedures and, therefore, do not appear elsewhere in this publication. Personnel must understand and apply these precautions during all phases of operation and maintenance. Keep Away From Live Circuit s Personnel must observe all applicable safety regulations [...]

  • Page 6

    Antenna The 2.4-meter transportable SNG antenna from Andrew has been designed to be more compact and lighter . This new design result s in an antenna whose total assembly weight has decreased by 33%. This antenna design reduces overall windloading, is easier to install and is less costly to ship. The stow height is at 24” for more overall clearan[...]

  • Page 7

    General Introduction Antenna Driv e System Cable Inspection 7 Maintenance Maintenance The antenna and feed boom/reflector assembly incorporates self lubricating bearing assemblies throughout its construction, eliminating the need for any additional lubrication for the life of the antenna. The feed system is factory precision aligned for optimum per[...]

  • Page 8

    Cable R e placement Azimuth R otational Limits 8 Maintenance The two adjustment locations for the five azimuth cables are 224° apart on the azimuth ring. T o reach these adjustment locations the antenna must be rot ated so the azimuth cable access port is over the adjustment location. Rotation to the counter-clockwise (CCW) adjustment location may[...]

  • Page 9

    9 Maintenance Note AZ East = AZ Counter-clockwise (as viewed from above) AZ West = AZ Clockwise (as viewed from above) Azimuth Hard Limit Positions: 1=90° CCW Az Limit 2=135° CCW Az Limit 3=175° CCW Az Limit 4=175° CW Az Limit 5=135° CW Az Limit 6=90° CW Az Limit Azimuth Cable T ension Access Port Azimuth Ring Azimuth Limit Switch Location Re[...]

  • Page 10

    Azimuth Driv e Cable T ension Adjustment Ste p 1 Ste p 2 Ste p 3 Ste p 4 10 Maintenance CAUTION! Before/during the initial azimuth rot ation of the re-calibrated antenna, verify by inspection that there are no pinch point s with any antenna accessories (example: waveguide, cables, etc.) p assing through the center of the antenna mount. With the Sof[...]

  • Page 11

    Ste p 5 Ste p 6 Ste p 7 Ste p 8 Ste p 9 11 Maintenance Insert the precision key stock into the vertical slot in the azimuth spring housing, see Figure 2 (the key stock acts as a thickness (feeler) gauge) then st arting with the lowest cable tension adjusting nut, (nearest the bottom of the antenna mount) tighten each cable until the key stock is ju[...]

  • Page 12

    Ste p 10 Ste p 11 Ste p 12 Ste p 13 Ste p 14 12 Maintenance CAUTION! Be sure no interference is present in and around the azimuth axis opening during antenna rot ation. After tensioning both ends of azimuth cable assembly , rotate azimuth to limits of travel (clockwise and counterclockwise) several times to distribute cable tension evenly . Recheck[...]

  • Page 13

    Ele v ation Driv e Cable T ension Adjustment Ste p 1 Ste p 2 Ste p 3 Ste p 4 13 Maintenance Adjustment of the elevation cable tension does not require a unique elevation angle, only an elevation angle that allows convenient access to cable tension adjusting nuts (Figure 4). Figure 4. Elevation Cable T ension Adjustment Cable tension adjustment for [...]

  • Page 14

    Controls and P ow er Failure Azimuth Driv e Ste p 1 Ste p 2 Ste p 3 In the event of power loss or controller failure with antenna deployed, the following pro- cedure will allow the antenna to be returned manually to stow position. Notice! Stowing antenna without power requires two personnel to safely return antenna to stowed position. Failure to fo[...]

  • Page 15

    Ste p 4 Ste p 5 Ste p 6 Ste p 7 Using a 5/32” Allen wrench, turn the two manual release screws counter-clockwise until the brake releases (Figure 7). Figure 7. Brake Release Procedure. (azimuth gear motor shown, elevation gear motor similar) When the brake is released, a black/red disk assembly (brake/clutch mechanism ) will begin to rotate as th[...]

  • Page 16

    Ele v ation Driv e Ste p 1 Ste p 2 Ste p 3 With the azimuth orientation of the antenna correctly oriented for stowing, locate the brake cover on the elevation drive motor , (the same size and type of motor is used for both elevation and azimuth drives) and follow the same procedure required for azimuth brake release. CAUTION! When Elevation Brake i[...]

  • Page 17

    Azimuth Brak e R e placement Pur pose R equired T ools (Customer- Supplied) Caution Ste p 1 Provide instruction to remove and replace the azimuth and/or elevation brake assembly used on the ESA24SNG-L TE-XX Series 2.4M SNG Antenna. • No. 2 Phillips Screwdriver (Must have good tip that fit s screw head well) • Small propane torch (or equivalent)[...]

  • Page 18

    Ste p 2 Ste p 3 Remove the two wingnuts and two nylon washers att aching the brake cover . Refer to Figure 2. Retain removed hardware for later use. Figure 2 Remove the two 8-32 nuts securing the brake body to the brake base. Once the brake body is removed a large nut attached to the motor shaf t and the motor shaft will be revealed. The nut/shaft [...]

  • Page 19

    Caution Ste p 4 Ste p 5 New Threadlocker Must Be Applied T o the Brake Nut Set screws T o Prevent Premature Brake Failure! Install new brake body on 8-32 studs until seated on brake nut and flush as detailed in Figure 4. After disc is centered brake nut may be rotated slowly to allow brake nut to line up with brake disc. Install 8-32 nut s and tigh[...]

  • Page 20

    Ste p 6 Ste p 7 Locate the small weep hole in the brake cover near the hole for the protective tubing. It may be painted closed and easier to locate from inside the cover . Use the 1/16 inch drill bit to drill a 1/16 inch hole enlarging and cleaning out this existing hole. This weep hole is essential to allow equalization of pressure inside the bra[...]

  • Page 21

    Ele v ation Brake R e placement Caution Ste p 1 Ste p 2 The elevation brake replacement procedure is identical to the azimuth brake replacement. Refer to the previous azimuth procedure for det ails. This Procedure Should Only Be Performed In Non-Windy Conditions (Winds Under 15 mph). When the Brake Is Removed the Antenna Will Be Allowed to "Fr[...]

  • Page 22

    Antenna Electrical Operating Frequency Band Ku-Band Receive Ku-Band T ransmit 10.95-12.75 GHz 14.0-14.5 GHz Gain at circular waveguide flange of feed 2-Port Rx Frequency Rx Gain Tx Frequency Tx Gain 1 1.950 GHz 47.7 14.25 GHz 49.2 4-Port Rx Frequency Rx Gain Tx Frequency Tx Gain 1 1.950 GHz 47.4 14.25 GHz 48.9 Polarization Linear Polarization Discr[...]

  • Page 23

    Antenna Mechanical Configuration ESA24SNG-L TE Feed T ype Prime Focus, Offset Reflector Material Precision-Formed Aluminum Reflector Segments 1 Mount T ype El over Az, Pedestal Material/Finish Reflector Aluminum Feed Brass Positioner Aluminum Feed Arm Capacity 180 lbs Area 29.5” x 36.5” x 12” High (8.3 ft 3 ) Antenna Pointing Range, Continuou[...]

  • Page 24

    Antenna Dimensions 24 Specifications Antenna Overall Dimensions - T op View 10’-0” 8’-3” Elevation and Articulation Axis Note: Antenna Shown in S towed Position X Y Antenna Overall Dimensions - Side View Azimuth Axis 9’-1 1” 2’-7” 7’-4” 5” 1’-6” 2” 12” 15” 2’-0” 8 x ø .562” ø 1 1.5” ø 16.25” 1 1.25° 45?[...]

  • Page 25

    Antenna Dimensions 25 Specifications Antenna Clearance Envelope and Center of Gravity - Side View 16’-10” 10’-0” 7’-7” Elevation and Articulation Axis 1” 1 1’-4” 8’-8” 6’-1 1” Elevation and Articulation Axis 8’-4” 6” 5” Azimuth Axis 1’-6” 3’-1” 2’-0” Note: Antenna Shown at 65° Elevation 7’-7” R 4?[...]