Andrew ES24SNG-LTE, Operation And Maintenance

Page 1: ...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 Copyright 2002 by Andrew Corporation Operation and Maintenance Bulletin OM24SNG RC Type ES24SNG LTE 2 4 Meter SNG 2 4 Meter SNG Earth Station Antenna ...

Page 2: ...roduction 7 Antenna Drive System Cable Inspection 7 Cable Replacement 8 Azimuth Rotational Limits 8 Azimuth Drive Cable Tension Adjustment 10 Elevation Drive Cable Tension Adjustment 13 Controls and Power Failure 14 Azimuth Drive 14 Elevation Drive 16 Replacement Azimuth Brake Replacement 17 Elevation Brake Replacement 21 Antenna Electrical 22 Antenna Mechanical 23 Antenna Dimensions 24 Table of C...

Page 3: ... in part without express written consent of Andrew Corporation Andrew Corporation provides a world wide technical support network Refer to the tech nical assistance portion of this this manual for the contact numbers appropriate to your location The installation maintenance or removal of antenna systems requires qualified experi enced personnel Andrew installation instructions have been written fo...

Page 4: ...ed such as the following Place or change orders Check price and delivery information Request technical literature You can call from any of the following Call From Telephone Fax North America 1 800 255 1479 toll free 1 800 349 5444 toll free United Kingdom 00 800 0 255 1479 toll free 00 800 0 349 5444 toll free Australia 0011 800 0 255 1479 toll free 0011 800 0 349 5444 toll free China 00 800 0 255...

Page 5: ...nt to confirm that a circuit is at ground potential before touching it Never reach into or enter an enclosure to service or adjust the equipment until the absence of power has been confirmed Do Not Service Or Adjust Alone Under no circumstances should any person reach into the enclosure for the purpose of servicing or adjusting the equipment except in the presence of someone who is capable of rend...

Page 6: ...llite news gathering applications The exclusively designed prime focus beam shaping feed configuration together with the precision hydroformed aluminum reflector assembly produces extremely high gain superior efficiency and closely controlled pattern characteristics A motorized cable drive system provides a reliable precise and smooth running system The SNG antenna options are the RCI 3000 and 305...

Page 7: ...placement Operation with less than the total number of cables is not recommended as normal oper ational mode however the drive will function with reduced stiffness temporarily while awaiting replacement cable installation Drive cables should be periodically checked for cable misalignment or visible damage that might lead to broken wires and or tangled cables Look for frayed broken cable wires that...

Page 8: ...uck the azimuth hard limits may have been changed by the integrator to less than 175 of rotation If the azimuth hard limits are at 175 the following procedure WILL NOT be necessary Skip down the following Procedure and start at section marked CABLE TENSION ADJUSTMENT AZIMUTH DRIVE If the azimuth hard limits are configured for 135 or 90 the following provisions will need to be made prior to startin...

Page 9: ... 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 Tension Access Port Azimuth Ring Azimuth Limit Switch Location Reflector Assembly Azimuth Drive Motor Antenna Panning Frame Overhead View of Antenna Note Resolver assembly and associated mounting bracketry not shown for clarity ...

Page 10: ...nother as they wrap around the drum height centering Rotate drum if necessary to align cables Remove the rear rain shield which covers the azimuth axis opening Remove cable tension access port cover located near azimuth drive gear reducer Starting from the stowed position deploy antenna and rotate in azimuth approximately 80 clockwise to align access port on panning frame with spring end of cables...

Page 11: ...ing Location of Precision Key Stock Insertion Point Loosen the adjusting nut just slightly so that the key stock will move freely up and down and allow setting clearance on subsequently adjusted cables Figure 3 Figure 3 Adjusting Azimuth Cable Tension Repeat step 5 for the next cable adjusting nut s Return antenna to azimuth stowing position while maintaining current antenna elevation From the sto...

Page 12: ...ion at both ends of azimuth cable s in accordance with the above recommended procedure Repeat above cable tensioning procedure if necessary If changed earlier reset the software limits and reconfigure the hardware limits for counter clockwise azimuth rotation to their previous value location Return antenna to stow position before relocating any hard limit actuation blocks see section titled Azimut...

Page 13: ...ble location in the eleva tion spring housing Figure 5 Figure 5 Individual Slots for Precision for Precision Key Stock After verifying performing elevation cable tension procedure on both ends of each cable and each elevation drum cable assembly the following steps two through four will com plete this procedure Run elevation drive system through entire range of movement 0 to 66 elevation sev eral ...

Page 14: ...rmine direction of rotation to return anten na to stow position Locating the brake cover on the azimuth drive motor located on the free hanging end of the drive motor assembly Figure 6 is the brake cover Carefully remove the brake cover attached with two wing nuts being careful to retain the nylon washers under the wing nuts required for watertight seal Figure 6 Location of Azimuth Brake Assembly ...

Page 15: ...ed a black red disk assembly brake clutch mechanism will begin to rotate as the motor free wheels This may be used as a visual sign that brake disengagement has been achieved Release the brake and rotate in azimuth to achieve azimuth stowing position The end of the feed boom may be used as a push point for azimuth rotation only during power loss Install the brake cover with the nylon washers and w...

Page 16: ...d in the Pproper Direction by a Second Person As the Feed Boom Approaches a Horizontal Position Care Must be Taken During Manual Brake Release as the Stowing Boom Will Pass Through the Access Area to the Brake Coordinating With a Second Person Assisting Guiding Reflector to Stow Position Brake Release Operator Will Need to Work Carefully Around Closing Reflector Assembly Avoiding Scissor Action of...

Page 17: ... 4 Lumber 5 foot long 5 32 Allen Wrench 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 Two Persons Are Required To Safely Remove and Reinstall the Brake Assembly One Person To Perform the Replacement and the Other To Hold the Antenna In Position Turn Off Main Power Source To the Controller System...

Page 18: ... nut shaft will be allowed to move freely If wind or gravity force is present on the antenna the nut shaft may start to turn If it turns the second person should steady the antenna movement until the new brake is installed Lay aside the brake body brake cover and connecting wire until later instructions Refer to Figure 3 Retain removed hardware for later use Figure 3 18 Brake Release Hardware Brak...

Page 19: ...ove the two black wires from the old brake body from their wirenuts attached to the red and black wires Install the new brake body wires in the same manner as the old ones were removed Either black brake wire may be connected to either the red or black wires polarity is not important Be sure not to reverse the wiring of the diode POLARITY DOES MATTER ON THE DIODE Be sure wire nut setscrews are sec...

Page 20: ...cover removing any shavings or debris Refer to Figure 6 Figure 6 There are two ways the cover may be installed Install the brake cover with the weep hole facing down Use the nylon washers under the wing nuts to provide a water tight seal as detailed in Figure 7 Figure 7 This completes the replacement of the azimuth brake assembly The antenna control power should now be turned back on and the azimu...

Page 21: ...d the Antenna In Position Locate the elevation brake at the front of the azimuth panning frame Refer to Figure 8 Figure 8 Due to the weight of the boom the elevation boom and reflector must be sup ported during the elevation brake replacement process The antenna elevation axis should be driven to an angle high enough to provide clearance to work under the boom on the brake assembly A 2 X 4 inch pi...

Page 22: ...tions at 68 F 20 C at the circular waveguide flange of the feed Elevation Ku Band 2 Port Ku Band 4 Port 10 44 72 30 33 61 Antenna VSWR Transmit and Receive 1 3 1 Radiation Pattern Performance PE s 4471 and 4472 Tx Power Handling Capability 2 Port Network maximum W 2000 4 Port Network maximum W 600 Feed Interface Flanges Receive Transmit WR75 Isolation minimum Tx into Rx dB 40 2 Port 85 4 Port Powe...

Page 23: ...to 65 mph 105 km h Temperature Operational 40 to 125 F 40 to 52 C Rain 4 in 102 mm per hour Solar Radiation 360 BTU hr ft2 1135 Watts m2 Relative Humidity 100 Atmospheric Conditions Moderate coastal industrial areas Severe conditions require additional protection Positioner Travel Rates degrees per second Elevation 0 25 to 1 0 second Azimuth 0 25 to 1 0 second Polarization 0 5 to 2 0 second Weight...

Page 24: ...rall Dimensions Side View Azimuth Axis 9 11 2 7 7 4 5 1 6 2 12 15 2 0 8 x ø 562 ø 11 5 ø 16 25 11 25 45 Stowed Antenna Position Mounting Pattern on Truck Approximate Antenna Weight Distribution 4 9 4 6 Elevation and Articulation Axis 2 2 2 Antenna CG 690 lbs Reflector Only 177 lbs 1 9 9 Boom Only CG 126 lbs no electronics Mount Only CG 387 lbs Azimuth Axis 1 12 16 9 ...

Page 25: ...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 9 R Azimuth Axis 1 8 R Elevation and Articulation Axis Antenna Clearance Envelope Top View 1 5 1 5 Boom Stop 2 2 x 3 x 1 4 x 6 lg Azimuth Axis Elevation and Articulation Axis 1 10 7 15 8 5 7 6 6 67 7 Antenna Clearance Envelope Side View Note Antenna Shown at 0 Elevation X ...