Table of Contents
Advertisement
Quick Links
Operation and Maintenance
Type ES24SNG-LTE-( )
2.4-Meter SNG
2.4-Meter SNG Earth Station Antenna
Andrew Corporation
10500 West 153rd Street
Orland Park, IL U.S.A. 60462
Telephone: 708-349-3300
FAX (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
Bulletin OM24SNG-RC
Printed in U.S.A. 7/02
Copyright © 2002 by Andrew Corporation
Advertisement
Table of Contents
Related Manuals for Andrew OM24SNG-RC
Summary of Contents for Andrew OM24SNG-RC
- Page 1 Orland Park, IL U.S.A. 60462 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 Bulletin OM24SNG-RC Printed in U.S.A. 7/02 Copyright © 2002 by Andrew Corporation...
-
Page 2: Table Of Contents
Introduction Purpose ................3 Proprietary Data . -
Page 3: Introduction
The technical data contained herein is proprietary to Andrew Corporation. It is intended for use in operation and maintenance of Andrew supplied equipment. This data shall not be disclosed or duplicated in whole or in part without express written consent of Andrew Corporation. -
Page 4: Technical Assistance
For technical assistance, call the following numbers at anytime. Call From North America (toll free) Any Location (International) The Andrew Customer Service Center gives you direct access to the information and personnel service you need, such as the following: • Place or change orders •... -
Page 5: Safety Summary
Safety Summary 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 Circuits Personnel must observe all applicable safety regulations at all times. -
Page 6: Description
Description Antenna The 2.4-meter transportable SNG antenna from Andrew has been designed to be more compact and lighter. This new design results 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. -
Page 7: General
Maintenance General 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 performance, moving or reposi- tioning feed system will only reduce performance capabilities. -
Page 8: Cable Replacement
(CCW) adjustment location may be hindered by hardware and software limits. This document primarily addresses azimuth cable tension requirements and also includes elevation cable tension requirements for completeness. Cable Cable replacement is beyond the scope of normal maintenance, please consult Andrew Replacement Corporation for assistance. Azimuth... - Page 9 Azimuth Hard Limit Positions: 1=90° Az Limit 2=135° Az Limit 3=175° Az Limit 4=175° Az Limit 5=135° Az Limit 6=90° Az Limit Azimuth Drive Motor Antenna Panning Frame Note: Resolver assembly and associated mounting bracketry not shown for clarity. Overhead View of Antenna AZ East = AZ Counter-clockwise (as viewed from above) AZ West = AZ Clockwise (as viewed from above) Azimuth Cable Tension Access Port...
-
Page 10: Azimuth Drive Cable Tension Adjustment
Before/during the initial azimuth rotation of the re-calibrated antenna, verify by inspection that there are no pinch points with any antenna accessories (example: waveguide, cables, etc.) passing through the center of the antenna mount. With the Software and hardware limits reset for to 175° azimuth counter-clockwise rota- tion the following azimuth cable tension adjustment will now be possible. - Page 11 Step 5 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 starting with the lowest cable tension adjusting nut, (nearest the bottom of the antenna mount) tighten each cable until the key stock is just snug but can be slid up and down.
- Page 12 Be sure no interference is present in and around the azimuth axis opening during antenna rotation. Step 10 After tensioning both ends of azimuth cable assembly, rotate azimuth to limits of travel (clockwise and counterclockwise) several times to distribute cable tension evenly. Step 11 Recheck/verify cable tension at both ends of azimuth cable(s) in accordance with the above recommended procedure.
-
Page 13: Elevation Drive Cable Tension Adjustment
Elevation Adjustment of the elevation cable tension does not require a unique elevation angle, Drive Cable only an elevation angle that allows convenient access to cable tension adjusting nuts (Figure 4). Tension Adjustment Cable tension adjustment for the elevation drive is similar to the azimuth drive, except there are individual slots for the precision key stock at each cable location in the eleva- tion spring housing, (Figure 5). -
Page 14: Controls And Power Failure
Emergency Procedures Controls and Power Failure Azimuth Drive Step 1 Step 2 Step 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. Stowing antenna without power requires two personnel to safely return antenna to stowed position. - Page 15 Step 4 Using a 5/32” Allen wrench, turn the two manual release screws counter-clockwise until the brake releases (Figure 7). (azimuth gear motor shown, elevation gear motor similar) Step 5 When the brake is released, a black/red disk assembly (brake/clutch mechanism ) will begin to rotate as the motor free-wheels.
-
Page 16: Elevation Drive
Elevation Drive Step 1 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. -
Page 17: Replacement
Azimuth Brake Replacement Purpose Provide instruction to remove and replace the azimuth and/or elevation brake assembly used on the ESA24SNG-LTE-XX Series 2.4M SNG Antenna. Required Tools (Customer- Supplied) Caution 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 "Freewheel". - Page 18 Step 2 Remove the two wingnuts and two nylon washers attaching the brake cover. Refer to Figure 2. Retain removed hardware for later use. Brake Wires Step 3 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 shaft and the motor shaft will be revealed.
- Page 19 Caution New Threadlocker Must Be Applied To the Brake Nut Setscrews To Prevent Premature Brake Failure! Step 4 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.
- Page 20 Step 6 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.
-
Page 21: Elevation Brake Replacement
Elevation Brake The elevation brake replacement procedure is identical to the azimuth brake Replacement replacement. Refer to the previous azimuth procedure for details. Caution 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 "Freewheel". -
Page 22: Specifications
Specifications Antenna Electrical Operating Frequency Band Gain at circular waveguide flange of feed Polarization Polarization Discrimination, on axis Beamwidth, at Midband Antenna Noise Temperature under clear sky conditions, at 68° F (20° C), at the circular waveguide flange of the feed. Antenna VSWR, Transmit and Receive Radiation Pattern Performance Tx Power Handling Capability... -
Page 23: Antenna Mechanical
Antenna Mechanical Configuration Feed Type Reflector Material Reflector Segments Mount Type Material/Finish Feed Arm Antenna Pointing Range, Continuous Wind Loading, Survival Wind Loading, Operational (motor drives) Temperature, Operational Rain Solar Radiation Relative Humidity Atmospheric Conditions Positioner Travel Rates, degrees per second Weight, Net Electrical Requirements Reflector... -
Page 24: Antenna Dimensions
Antenna Dimensions 10’-0” Note: Antenna Shown in Stowed Position Elevation and Articulation Axis Antenna Overall Dimensions - Top View 8 x ø .562” ø 11.5” ø 16.25” Mounting Pattern on Truck Azimuth Axis 9’-11” 5” 7’-4” 1’-6” Antenna Overall Dimensions - Side View Elevation and Articulation 4’-9”... - Page 25 Antenna Dimensions 10’-7” 1” Elevation Articulation Axis 6” 7’-6” Antenna Clearance Envelope - Side View Elevation Articulation Axis 1’-8” R Antenna Clearance Envelope - Top View 16’-10” Elevation 11’-4” Articulation Axis 1” 8’-8” 5” Azimuth Axis 6’-11” 1’-6” Antenna Clearance Envelope and Center of Gravity - Side View Note: Antenna Shown at 0°...