Andrew OM24SNG-RC Installationsanleitung

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 Printed in U.S.A. 7/02

Operation and Maintenance Bulletin OM24SNG-RC

Type ES24SNG-LTE-( )

2.4-Meter SNG

2.4-Meter SNG Earth Station Antenna

Introduction

Description

Maintenance

Emergency

Procedures

Component

Replacement

Specifications

Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Proprietary Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Information and Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 Contents

Purpose

Proprietary Data

Information 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 information on general system and equipment.

A separate user’s manual is provided with each RCI 3000 or 3050 control system.

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.

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 for such personnel.

Antenna systems should be inspected by qualified personnel to verify proper installation,

maintenance and condition of equipment.

Andrew Corporation disclaims any liability or responsibility for the results of improper or

unsafe installation and maintenance practices.

All designs, specifications, and availabilities of products and services presented in this

manual are subject to change without notice.

Introduction

Technical

Assistance

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. (708)-349-3300 (708)-349-5410

(International)

Customer Service Center

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

•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 00-800-0-255-1479 (toll free) 00-800-0-349-5444 (toll free)

New Zealand 00-800-0-255-1479 (toll free) 00-800-0-349-5444 (toll free)

Hong Kong 001-800-0-255-1479 (toll free) 001-800-0-349-5444 (toll free)

4Introduction

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. Ensure power is

removed from unit before replacing components. Potential hazards may exist even

though the power control is in the off position. Capacitors retain charges. Always remove

power and use test equipment 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 rendering aid.

Resuscitation

Personnel working with or near high voltage should be familiar with modern methods of

resuscitation. Such information may be obtained from local medical personnel.

ESD Precaution

This equipment contains electrostatic discharge (ESD) sensitive devices. Equipment

handling methods and materials must be used to prevent equipment damage.

5Introduction

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. The stow height is at 24” for more overall clearance for the truck.

The vehicle mountable 2.4-meter prime focus offset fed antenna from Andrew incorpo-

rates performance and optional characteristics particularly suited for television broadcast

industry satellite 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 3050 control systems.

Antenna travel is stow to +65° (optional 90°) in elevation and ±175° in azimuth.

Each SNG antenna is fully-integrated and pretested before leaving the factory to reduce

vehicle installation time and costs.

Reflector

Assembly

Feed

System

Polarization

Drive Assembly

Azimuth

Drive Assembly

Elevation

Drive Assembly

Description

General

Introduction

Antenna Drive

System Cable

Inspection

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 performance, moving or reposi-

tioning feed system will only reduce performance capabilities. Do not move the feed sys-

tem.

The polarization drive system does not require any periodic maintenance; however

replacement of the polarization drive chain may be necessary after extended use (usual-

ly several years).

Periodic maintenance of the Roto-Lok®drive normally requires only visual inspection for

misalignment or damaged cables. In the event that a cable(s) may require replacement,

the drive design incorporates sufficient clearance between the capstan and drum, allow-

ing removal and installation of individual cables. In the event the drive has become dis-

abled due to broken/tangled cables and cannot be driven safety to a stow/repair posi-

tion, the margin of safety in the drive design, will allow for a cable(s) to be removed to

enable the drive to be rotated to a safe stow/repair position for cable replacement.

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 might occur due to normal wear after extended lifetime, or through contact

with foreign objects, such as hand tools during servicing of the antenna. In the event of

frayed/broken wires are discovered, they should be replaced as soon as possible to pre-

vent damage to neighboring cable assemblies.

Check cables every four weeks for the first six months of operation (cable tension,

frayed/broken wires). Thereafter, monitor cables biannually. For continuous use of anten-

na drive system, shorten the above recommended periodic interval by one half.

The rated capacity/stiffness of the Roto-Lok®drive system is directly related to tension

within the cables configuring the azimuth and elevation drive system. Proper cable ten-

sion is essential for the antenna drive system to perform as specified. How to verify and

maintain proper cable tension is considered in the following discussion.

CAUTION!

Do Not Over Tension the Cable When Tightening the Cable Tension Adjusting

Nuts. It is Possible to Break a Cable With the Mechanical Advantage of the

Threaded End!

Cable

Replacement

Azimuth

Rotational Limits

8Maintenance

The two adjustment locations for the five azimuth cables are 224° apart on the azimuth

ring. To reach these adjustment locations the antenna must be rotated so the azimuth

cable access port is over the adjustment location. Rotation to the counter-clockwise

(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 replacement is beyond the scope of normal maintenance, please consult Andrew

Corporation for assistance.

Depending on how the azimuth hard limits are currently configured, a hard limit override

may need to be made to allow sufficient rotation of the antenna for azimuth cable ten-

sion adjustment to be made. The "hard limits" are small, limit switch, trip blocks located

inside the azimuth ring. The azimuth hard limits may be configured for ±175°, ±135° or

±90° of travel by simply changing the hard limits actuation blocks installed position (one

hard limit for clockwise and one hard limit for counterclockwise rotation). The azimuth

hard limits are factory configured for ±175° of travel in both clockwise and counter-clock-

wise directions.

During the installation of the antenna onto the truck, 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 starting

azimuth cable tensioning procedure.

The counter-clockwise hard limit must be set to the 175° CCW position during the cable

tension adjustment procedure, then later re-configured. The clockwise hard limit will not

need to be removed/changed from any position of operation during the azimuth cable

tensioning procedure, only the CCW hard limit.

Review the overhead view of the antenna to determine the location of the CCW azimuth

hard limit and re-position the hard limit actuation block to the 175° CCW location (posi-

tion #3). Each actuation block is held in place by two #4-40 UNC x 1/2, SST, Flat Head

Screws. The retaining screws are installed with Loctite®, persistence may be required to

remove them. Careful inspection of the interior of the azimuth ring will reveal marked,

steel stamped degree and orientation information on the surface of the ring (i.e. 135°

CCW, 90° CCW, 175° CW etc.) use these marked locations to confirm correct position of

the azimuth hard limits.

After the counter-clockwise hard limit has been relocated to 175° CCW position, a sec-

ond level of protection for azimuth rotation will need to be addressed.

9Maintenance

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 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.

Azimuth

Drive Cable

Tension

Adjustment

Step 1

Step 2

Step 3

Step 4

10 Maintenance

CAUTION!

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.

Required Tools

•Precision 1/8-inch key stock, at least 6 inches long (supplied with antenna)

• ¼-inch drive ratchet with 7/16 standard or thin walled socket (not supplied with antenna)

Check cables around drum for proper alignment. Cables should be evenly spaced from

one another 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, until

directly under access port (Figure 1).

CAUTION!

Be sure no interference is present in and around the azimuth axis opening during

antenna rotation.

Figure 1. Azimuth Access Port Positioned Over Cable Adjusting Nuts

Note

To ensure that the cables are not tensioned beyond the design value, the precision key

stock must be used to detect when the cable tension adjusting nut has been tightened

so that the "Thrust Sleeve" is 0.005 to 0.010 inches from contacting the spring housing.

This will ensure the nominal spring compression and cable tension.

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