BrasilSat SCB37-160 Manual de usuario

MANUAL FOR

MODELS:

SCB37-160

SCB107-160

SCB107E-160

16 METERS CASSEGRAIN EARTH STATION ANTENNAS

C o n t e n t

1 General………………………………………………………………………………...2

2 Technical Specifications………………………………………………………………3

2.1 Specifications of the model SCB37-160…………………………………………….3

2.2 Specifications of the model SCB107-160…………………………………………...4

2.3 Specifications of the model SCB107E-160………………………………………….5

3 Structural Character and Operational Principle………………………………………..6

3.1 System Structural Character...................................................................…..................6

3.1.1 Antenna Structural Character..………………………………………….……….7

3.1.2 Antenna Pedestal Structure…..…………………………………………………13

3.1.3 Feed Structure…..………………………………………………………………17

3.2 Antenna Operation Principle..................................................................................... 19

4 Maintenance..............................................................................................................….19

4.1 Operation and Maintenance of Antenna.............…............ .....................…............. 19

4.2 Operation and Maintenance of Servo Equipment......................................…............ 22

1 General

The 16m antenna, a synthetic Cassegrain dual-reflector antenna models SCB37-160,

SCB107-160 and SCB107E-160, adopts some new technologies, such as high-performance

corrugated horn and broadband microwave network, etc.

The antenna performance meets the requirements of ITU-R/ITU-T、INTELSAT IESS-207 and

Resolution 572 of Anatel standards. It is not only provided with many excellent electric

performances, such as high efficiency, low sidelobe, low cross polarization, low Voltage

standing waves ratio (VSWR), high G/T value, but also with excellent characters including

appropriate structural design, strong wind resistance ability, beautiful appearance and high

tracking accuracy. It is a new generation satellite communication antenna.

This manual is applicable for the follow models of antenna:

SCB37-160: C-Band Cassegrain 16 meters antenna for Circular or Linear Polarization;

SCB107-160: Ku-Band Cassegrain 16 meters antenna for Linear Polarization;

SCB107E-160: Extend Ku-Band Cassegrain 16 meters antenna for Linear Polarization;

2 Technical Specifications

2.1 Specifications of the model SCB37-160:

Electrical Performance

Rx 3625 to 4200 MHz

Frequency Range Tx 5850 to 6425 MHz

Polarization Linear or Circular

Rx 54,7 dBi (@ 4,00 GHz)Gain

(Including Losses) Tx 58,2 dBi (@ 6,00 GHz)

Rx 0,34º (@ 4,00 GHz)

Half-power Beamwidth Tx 0,23º (@ 6,00 GHz)

10º El 42 K (@ 4,00 GHz)

20º El 36 K (@ 4,00 GHz)

Noise Temperature 30º El 33 K (@ 4,00 GHz)

Typical G/T, 20º elevation at clear Sky

with C Band LNA, 30 K 36,3 dB/K (@ 4,00 GHz)

Anatel Resolution 572

FCC regulation 25.209

Radiation Pattern Envelope ITU-RS580

Rx 1.06 (0,5 dB)Axial Ratio

(Circular Configuration) Tx 1.06 (0,5 dB)

Rx 35 dBCross Polarization Discrimination

(Linear Configuration) Tx 35 dB

Rx 1.3 (17.7 dB)

VSWR (Return Loss) Tx 1.3 (17.7 dB)

TX/RX 75 dB

Port to Port Isolation RX/TX 55 dB

Rx CPR 229G

Feed Termination (flange) Tx CPR 137 G

Input Maximum Power 2000 W

Mechanical Characteristics

Diameter 16 meters

Antenna Geometry Cassegrain

Motion Elevation over azimuth

Azimuth ± 90º

Elevation 0 a 90º

Motion Adjustment Polarization ± 50º

Reflector Material Aluminum

Mount Material Steel

Reflector White painting

Finishing Mount Hot dip galvanized

Surface Precision 0.5mm (RMS)

Environmental Characteristics

Operational Wind 130 km/h

Survival Wind 198 km/h

Shock and Vibration Typical in sea, air and terrestrial shipments

Atmosphere Found in seashore and industrial areas

2.2 Specifications of the model SCB107-160:

Electrical Performance

Rx 10700 to 12750 MHz

Frequency Range Tx 13750 to 14800 MHz

Polarization Linear

Rx 64,2 dBi (@ 12,00 GHz)Gain

(Including Losses) Tx 65,5 dBi (@ 14,00 GHz)

Rx 0,12º (@ 12,00 GHz)

Half-power Beamwidth Tx 0,10º (@ 14,00 GHz)

10º El 60 K (@ 12,00 GHz)

20º El 50 K (@ 12,00 GHz)

Noise Temperature 30º El 46 K (@ 12,00 GHz)

Typical G/T, 20º elev

ation at clear Sky

with C Band LNA, 60 K 43,3 dB/K (@ 12,00 GHz)

Anatel Resolution 572

FCC regulation 25.209

Radiation Pattern Envelope ITU-RS580

Rx 35 dB

Cross Polarization Discrimination Tx 35 dB

Rx 1.3 (17.7 dB)

VSWR (Return Loss) Tx 1.3 (17.7 dB)

TX/RX 75 dB

Port to Port Isolation RX/TX 55 dB

Rx WR 75

Feed Termination (flange) Tx WR 75

Input Maximum Power 1000 W

Mechanical Characteristics

Diameter 16 meters

Antenna Geometry Cassegrain

Motion Elevation over azimuth

Azimuth ± 90º

Elevation 0 a 90º

Motion Adjustment Polarization ± 50º

Reflector Material Aluminum

Mount Material Steel

Reflector White painting

Finishing Mount Hot dip galvanized

Surface Precision 0.5mm (RMS)

Environmental Characteristics

Operational Wind 130 km/h

Survival Wind 198 km/h

Shock and Vibration Typical in sea, air and terrestrial shipments

Atmosphere Found in seashore and industrial areas

2.3 Specifications of the model SCB107E-160:

Electrical Performance

Rx 10700 to 12200 MHz

Frequency Range Tx 12750 to 14500 MHz

Polarization Linear

Rx 63,8 dBi (@ 11,45 GHz)Gain

(Including Losses) Tx 65,2 dBi (@ 13,50 GHz)

Rx 0,12º (@ 11,45 GHz)

Half-power Beamwidth Tx 0,10º (@ 13,50 GHz)

10º El 60 K (@ 11,45 GHz)

20º El 50 K (@ 11,45 GHz)

Noise Temperature 30º El 46 K (@ 11,45 GHz)

Typical G/T, 20º elevation at clear Sky

with C Band LNA, 60 K 42,90 dB/K (@ 11,45 GHz)

Anatel Resolution 572

FCC regulation 25.209

Radiation Pattern Envelope ITU-RS580

Rx 35 dB

Cross Polarization Discrimination Tx 35 dB

Rx 1.3 (17.7 dB)

VSWR (Return Loss) Tx 1.3 (17.7 dB)

TX/RX 75 dB

Port to Port Isolation RX/TX 55 dB

Rx WR 75

Feed Termination (flange) Tx WR 75

Input Maximum Power 1000 W

Mechanical Characteristics

Diameter 16 meters

Antenna Geometry Cassegrain

Motion Elevation over azimuth

Azimuth ± 90º

Elevation 0 a 90º

Motion Adjustment Polarization ± 50º

Reflector Material Aluminum

Mount Material Steel

Reflector White painting

Finishing Mount Hot dip galvanized

Surface Precision 0.5mm (RMS)

Environmental Characteristics

Operational Wind 130 km/h

Survival Wind 198 km/h

Shock and Vibration Typical in sea, air and terrestrial shipments

Atmosphere Found in seashore and industrial areas

3 Structural Character and Operational Principle

3.1 System Structural Character

The 16m limit-motion antenna system is composed of antenna feed subsystem and structure

subsystem. The antenna feed subsystem contains feed and main reflector and subreflector

curves. The structure subsystem contains main reflector and subreflector, polarization rotation

device, pedestal and antenna feeder. The composition principles of antenna system are shown

in Fig.3.1-1. The picture is shown in Fig.3.1-2.

Fig.3.1-1 Composition Principle Block Diagram of Antenna System

Fig.3.1-2 Picture of 16m antenna

3.1.1

Antenna Structural Character

3.1.1.1

Antenna Reflector Assembly

The antenna reflector is mainly composed of main reflector, subreflector, backups,

subreflector supporting device, feed sleeve, etc. The three-dimensional forming diagram is

shown in Fig.3.1-3.

Fig.3.1-3 Structural Schematic Diagram of 16m Antenna

3.1.1.2

Main Reflector Design

The main reflector is one of the core components of the antenna system. Its theoretical curved

surface is formed by synthetic curve rotating around the axis of the antenna. The antenna

reflector is divided into multiple plates because of cumulative materials, manufacturing

engineering, final assembly adjustment, etc. The reflector is divided into three rings. Inner

ring reflector is divided into 16 same sector unit plates; the middle ring is divided into 32

sector unit plates and the outer ring is divided into 32 sector unit plates. So the main reflector

of antenna is composed of 80 reflector units, as shown in Fig.3.1-4 and 3.1-5.

Fig.3.1-4 Structure Diagram of Antenna Main Reflector

Fig.3.1-5 Individual Sector Plate Structure Schematic Diagram of Outer Ring

The stretched and shaped 2A12-O aluminum board with thickness of δ=2mm is used as

individual sector plate after quenching, stretching and shaping. Z type aluminum casting

material is used as back rib after quenching, stretching and shaping in order to perform

positioning with rivet the die table for riveting rib and reflector. Each sector plate is supported

at backups via 6 stretching bolts. In order to ensure the process precision, such process

technology as first bonding and second riveting is adopted to improve the strength of

individual plate and reduce the number of rivets and thus decrease the local deformation of

plate caused by riveting points. The high precision mould and tool set up process are used for

all procedures, such as stretching, stretch bending, riveting. The accuracy of the individual

plate is ≤0.15mm (R.M.S). The reassembly precision of whole main reflector is ≤0.45mm

(R.M.S).

3.1.1.3

Subreflector and Its Supporting Mechanism Design

The subreflector is made of aluminum casting material and adopts the integral structure. It is

manufactured with the numerically controlled machine tool to ensure its precision, which is

not more than 0.15mm (R.M.S). The subreflector supporting mechanism is composed of four

support rods and one adjustment mechanism. In order to reduce its shadow to the main

reflector and ensure the supporting rigidity, the subreflector support rod adopts the flat oval

steel tube, of which one end is supported at the main backups and the other is connected with

the subreflector through adjusting mechanism. The four adjusting bolts of adjusting

mechanism are used to implement the adjustment of subreflector axial movement, lateral

movement and drift angle. The three-dimensional forming diagram of subreflector and its

supporting mechanism is shown in Fig.3.1-6.

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