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MANUAL FOR

MODELS:

SCB37-120

SCB107-120

SCB107E-120

12 METERS CASSEGRAIN EARTH STATION ANTENNAS

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Summary of Contents for SCB107-120

Page 1: ...I MANUAL FOR MODELS SCB37 120 SCB107 120 SCB107E 120 12 METERS CASSEGRAIN EARTH STATION ANTENNAS...

Page 2: ...ons of the model SCB107E 120 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...

Page 3: ...h 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 res...

Page 4: ...r Configuration Tx 1 06 0 5 dB Rx 35 dB Cross 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...

Page 5: ...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 Maximu...

Page 6: ...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 Maxim...

Page 7: ...stem 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 ante...

Page 8: ...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...

Page 9: ...cturing 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 un...

Page 10: ...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...

Page 11: ...ency smooth stress transmission uniform stress favorable manufacture and installation etc and are widely applied because of the higher rigidity weight ratio The backups consist of the HUB radiating be...

Page 12: ...om so the cellular structure is formed in the whole HUB to make it have maximum rigidity The polyphenyl heat insulating material with thickness of 50mm is stuck in the tapering barrel of HUB to consti...

Page 13: ...eamless steel tubes with size of 50 3 Their characteristics are simple type uniform stress high rigidity and convenient surface treatment as shown in Fig 3 1 9 Fig 3 1 8 Schematic Diagram of HUB Fig 3...

Page 14: ...the lower end surface performs positioning with the rabbet of moving sleeve and the flanges are connected with bolts So the linear polarization direction of feed network can be adjusted only by rotati...

Page 15: ...ion etc The azimuth elevation supporting combination is a T type combination constituted by the kingpost and the tripod The kingpost with 900mm and length of 3 45m is decumbent on the previous one The...

Page 16: ...support arms at the two sides of decumbent cylinder at the top of azimuth elevation bearing combination there is a pair of axle holes orthogonal with the azimuth axis in which are the bearings The tw...

Page 17: ...ability The antenna can apply the brake safely at any position and at the same time the nut pair use double nuts for backlash elimination 3 1 2 4 Synchronization Device The azimuth and elevation synch...

Page 18: ...d is narrow there is no frequency section The principle block diagram is shown in Fig 3 1 12 The purpose of the mode converter section is to well convert the main mode TE11 in the circular waveguide i...

Page 19: ...18 Fig 3 1 13 Structural figure of corrugated horn in C band Fig 3 1 14 Structural figure of corrugated horn in Ku band...

Page 20: ...s used to make the antenna be able to align the satellite 4 Maintenance As outdoor equipment the antenna is exposed to natural environment such as wind rain and sun The life of the equipment is greatl...

Page 21: ...n is changed should enable the AZ leading screw to pass the position of the front support rod of the tripod that is at AZ 100 or 260 Generally 4 5 persons are needed for section changing and one perso...

Page 22: ...then paint it with zinc chromate primer as required once to twice and white polyurethane enamel twice to three times as required l There re two levels of moving speed of the antenna fast and slow The...

Page 23: ...the cycloid pinwheel reducer The method is to fill the grease hole with heavy duty gear oil 4 2 Operation and Maintenance of Servo Equipment a Don t turn on and turn off the power switches frequently...

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