4.8 Meter Compact Cassegrain Antenna

The Strength to Perform

The General Dynamics SATCOM Technologies 4.8-meter antenna delivers exceptional performance for transmit/ receive and receive-only applications for C through Ku-band frequencies. This antenna offers a deep dish reflector that incorporates precision-formed panels, contoured radials and hub assembly. It features an innovative feed and subreflector design which results in high gain, low noise temperature, high antenna efficiency and excellent rejection of noise and microwave interference.

The aluminum reflector is supported by a galvanized pedestal that provides the required stiffness for pointing and tracking accuracy. The pedestals are designed for full orbital arc coverage and are readily adaptable to ground or rooftop installations. The electrical performance is compliant with ITU and FCC sidelobe specifications. Type approved configurations are available for Intelsat (F1, E2), Eutelsat (L), Asiasat, Hispasat, EuropeStar or Singapore Telecom. All configurations meet SATCOM Technologies’ own type-approved quality assurance and performance guarantee.

Features

  • ‘Type-Approved,’ bolt-together
  • 3.4 to 18.4 GHz operation, meeting ITU and FCC
  • Aluminum reflector, galvanized pedestal
  • 125 mph (200 km/h) wind survival
  • High-wind option

Options

  • C, X, Ku and DBS-band feed configurations
  • C/Ku receive-only feed systems
  • Specialized feed systems (e.g. extended, multi-band)
  • Improved feed cross-pol performance
  • Fixed or motorizable pedestal mounts
  • Antenna control system with tracking
  • Reflector and feed deicing systems
  • Environmental hub configurations
  • Integrated transmit cross-axis kits
  • Integrated LNA or LNB systems
  • HPAs, converters and M&C systems
  • Load frame or non-penetrating mounts
  • Packing for sea and air transport
  • Turnkey installation and testing

Upgrades

  • X-band low PIM reflector/feed configurations
  • Extended azimuth travel
  • High wind configuration
  • Low operating temperatures
  • High power configurations
  • For Ka-band see separate datasheet

Specifications

C-Band 2-Port Circular Polarized
C-Band 4-Port Circular Polarized (4)
X-Band 2-Port Circular Polarized
Ku-Band 4-Port Linear Polarized (4)
DBS-Band 4-Port Linear Polarized
Electrical (1) Receive Transmit Receive Transmit Receive Transmit Receive Transmit Receive Transmit
Frequency (GHz)
3.625 -
4.200
5.850 -
6.425
7.250 -
7.750
7.900 -
8.400
10.700 -
12.750
13.750 -
14.500
10.700 -
12.750
17.300 -
18.400
17.700-
21.200
27.500-
31.000
Antenna Gain, Midband dBi (2) 44.16  45.90  47.30  47.70  51.10  52.40
 51.40  54.60  54.90  57.80
VSWR 1.55:1  1.30:1  1.25:1  1.25:1  1.30:1  1.30:1  1.30:1  1.30:1  1.30:1  1.30:1
Pattern Beamwidth (2)
-3 dB, at midband

1.04°

0.87°

0.72°

0.69°

0.47°

0.41°

0.45°

0.31°

.028°

0.20°
Antenna Noise Temperature (K)
5° Elevation
10° Elevation
20° Elevation
40° Elevation

60
57
47
43

54
44
39
37
 
61
51
45
42
 
80
67
58
53
 
73
59
50
44
 
Typical G/T (dB/K) (3)
25.3
(4.000 GHz, 30 K LNA)
25.6
(4.000 GHz, 30 K LNA)
  30.0
(7.500 GHz, 45 K LNA)
  32.4
(11.850 GHz, 70 K LNA)
  32.3
(11.725 GHz, 70 K LNA)
 
Axial Ratio (dB)  1.80  0.75  0.50  0.50  1.50  1.50        
Power Handling (total)    5 kW CW    5 kW CW    5 kW CW    2 kW CW    2 kW CW
Cross Polarization Isolation (dB)
On Axis
Within 1.0 dB beamwidth

19.7
19.7

27.3
27.3

30.8
30.8

30.8
30.8

21.3
21.3

21.3
21.3

35.0
35.0

35.0
35.0

35.0
35.0

35.0
30.0
Port to Port Isolation (dB)
- Rx/Tx (Rx frequency)
- Tx/Rx (Tx frequency)
RF Specification

0
-100
975-2635

-60
0
975-2635

0
-85
975-4289

-85
0
975-4289

0
-110
975-2427

-110
0
975-2427

0
-85
975-2114

-50
0
975-2114

0
-85
975-2446

-75
0
975-2446
Sidelobe Performance  ITU-RS-580 ITU-RS-580, FCC

 

Mechanical/Environmental (5) Fixed Post Mount Pedestal (PM) Motorized Kingpost Pedestal Motorizable High Wind Kingpost Pedestal (KP-HW)
Antenna Diameter 4.8 meters (15.83 feet)
Antenna Type Compact Cassegrain design
Reflector Construction 16 precision-formed aluminum panels with heat-diffusing white paint
Cleaned and brightened aluminum back-up structure
Hub Dimensions 48 in (122 cm) OD, 29 in (74 cm) depth
Mount Configuration Elevation over azimuth pedestal, constructed of galvanized A36 steel
Drive Type
Azimuth Travel
Elevation Travel
Manual struts
360° coarse, 40° fine adjustment
0 to 90° continuous
Manual Strut or jack screws
120° continuous
0 to 90° continuous
Manual jack screws
120° continuous
0 to 90° continuous
Foundation (L x W x D)
Concrete
Reinforcing Steel
12.5 x 12.5 x 1.5 ft (3.8 x 3.8 x 0.38 m)
8.7 yds³ (6.65 m³)
1,125 lbs. (510 kg)
16.5 x 16.5 x 2.5 ft (5.0 x 5.0 x 0.76 m)
25.5 yds³ (19.5 m³)
1,680 lbs. (762 kg)
Shipping Containers One 20 ft standard (4 units in one 40 ft)  One 20 ft standard (2 units in one 40 ft)  Two units in one 40 ft standard
Operational Wind Loading
Survival Wind Loading
- Any position
- At Zenith
45 mph (72 km/h) gusting to 60 mph (97 km/h)

125 mph (200 km/h) @ 58° F (15° C), any position; 130 mph (209 km/h) at preferential stow orientation
n/a
Up to 62 mph (100 km/h)

180 mph (290 km/h) @ 58° F (15° C)
210 mph (338 km/h) @ 58° F (15° C)
Operational Temperature
Survival Temperature
+5° to +122° F (-15° to +50° C)
-22° to +140° F (-30° to +60° C), low temperature options available
Rain Up to 4 in/h (10 cm/h)
Relative Humidity 0 to 100% with condensation
Solar Radiation 360 BTU/h/ft² (1,000 Kcal/h/m²)
Ice (survival) 1 in (2.5 cm) on all surfaces or 1/2 in (1.3 cm) on all surfaces with 80 mph (130 km/h) wind gusts
Atmospheric Conditions As encountered in coastal regions and/or heavily industrialized areas
Shock and Vibration As encountered during shipment by airplane, ship or truck
  • Features

    The aluminum reflector is supported by a galvanized pedestal that provides the required stiffness for pointing and tracking accuracy. The pedestals are designed for full orbital arc coverage and are readily adaptable to ground or rooftop installations. The electrical performance is compliant with ITU and FCC sidelobe specifications. Type approved configurations are available for Intelsat (F1, E2), Eutelsat (L), Asiasat, Hispasat, EuropeStar or Singapore Telecom. All configurations meet SATCOM Technologies’ own type-approved quality assurance and performance guarantee.

    Features

    • ‘Type-Approved,’ bolt-together
    • 3.4 to 18.4 GHz operation, meeting ITU and FCC
    • Aluminum reflector, galvanized pedestal
    • 125 mph (200 km/h) wind survival
    • High-wind option

    Options

    • C, X, Ku and DBS-band feed configurations
    • C/Ku receive-only feed systems
    • Specialized feed systems (e.g. extended, multi-band)
    • Improved feed cross-pol performance
    • Fixed or motorizable pedestal mounts
    • Antenna control system with tracking
    • Reflector and feed deicing systems
    • Environmental hub configurations
    • Integrated transmit cross-axis kits
    • Integrated LNA or LNB systems
    • HPAs, converters and M&C systems
    • Load frame or non-penetrating mounts
    • Packing for sea and air transport
    • Turnkey installation and testing

    Upgrades

    • X-band low PIM reflector/feed configurations
    • Extended azimuth travel
    • High wind configuration
    • Low operating temperatures
    • High power configurations
    • For Ka-band see separate datasheet
  • Specifications

    Specifications

    C-Band 2-Port Circular Polarized
    C-Band 4-Port Circular Polarized (4)
    X-Band 2-Port Circular Polarized
    Ku-Band 4-Port Linear Polarized (4)
    DBS-Band 4-Port Linear Polarized
    Electrical (1) Receive Transmit Receive Transmit Receive Transmit Receive Transmit Receive Transmit
    Frequency (GHz)
    3.625 -
    4.200
    5.850 -
    6.425
    7.250 -
    7.750
    7.900 -
    8.400
    10.700 -
    12.750
    13.750 -
    14.500
    10.700 -
    12.750
    17.300 -
    18.400
    17.700-
    21.200
    27.500-
    31.000
    Antenna Gain, Midband dBi (2) 44.16  45.90  47.30  47.70  51.10  52.40
     51.40  54.60  54.90  57.80
    VSWR 1.55:1  1.30:1  1.25:1  1.25:1  1.30:1  1.30:1  1.30:1  1.30:1  1.30:1  1.30:1
    Pattern Beamwidth (2)
    -3 dB, at midband

    1.04°

    0.87°

    0.72°

    0.69°

    0.47°

    0.41°

    0.45°

    0.31°

    .028°

    0.20°
    Antenna Noise Temperature (K)
    5° Elevation
    10° Elevation
    20° Elevation
    40° Elevation

    60
    57
    47
    43

    54
    44
    39
    37
     
    61
    51
    45
    42
     
    80
    67
    58
    53
     
    73
    59
    50
    44
     
    Typical G/T (dB/K) (3)
    25.3
    (4.000 GHz, 30 K LNA)
    25.6
    (4.000 GHz, 30 K LNA)
      30.0
    (7.500 GHz, 45 K LNA)
      32.4
    (11.850 GHz, 70 K LNA)
      32.3
    (11.725 GHz, 70 K LNA)
     
    Axial Ratio (dB)  1.80  0.75  0.50  0.50  1.50  1.50        
    Power Handling (total)    5 kW CW    5 kW CW    5 kW CW    2 kW CW    2 kW CW
    Cross Polarization Isolation (dB)
    On Axis
    Within 1.0 dB beamwidth

    19.7
    19.7

    27.3
    27.3

    30.8
    30.8

    30.8
    30.8

    21.3
    21.3

    21.3
    21.3

    35.0
    35.0

    35.0
    35.0

    35.0
    35.0

    35.0
    30.0
    Port to Port Isolation (dB)
    - Rx/Tx (Rx frequency)
    - Tx/Rx (Tx frequency)
    RF Specification

    0
    -100
    975-2635

    -60
    0
    975-2635

    0
    -85
    975-4289

    -85
    0
    975-4289

    0
    -110
    975-2427

    -110
    0
    975-2427

    0
    -85
    975-2114

    -50
    0
    975-2114

    0
    -85
    975-2446

    -75
    0
    975-2446
    Sidelobe Performance  ITU-RS-580 ITU-RS-580, FCC

     

    Mechanical/Environmental (5) Fixed Post Mount Pedestal (PM) Motorized Kingpost Pedestal Motorizable High Wind Kingpost Pedestal (KP-HW)
    Antenna Diameter 4.8 meters (15.83 feet)
    Antenna Type Compact Cassegrain design
    Reflector Construction 16 precision-formed aluminum panels with heat-diffusing white paint
    Cleaned and brightened aluminum back-up structure
    Hub Dimensions 48 in (122 cm) OD, 29 in (74 cm) depth
    Mount Configuration Elevation over azimuth pedestal, constructed of galvanized A36 steel
    Drive Type
    Azimuth Travel
    Elevation Travel
    Manual struts
    360° coarse, 40° fine adjustment
    0 to 90° continuous
    Manual Strut or jack screws
    120° continuous
    0 to 90° continuous
    Manual jack screws
    120° continuous
    0 to 90° continuous
    Foundation (L x W x D)
    Concrete
    Reinforcing Steel
    12.5 x 12.5 x 1.5 ft (3.8 x 3.8 x 0.38 m)
    8.7 yds³ (6.65 m³)
    1,125 lbs. (510 kg)
    16.5 x 16.5 x 2.5 ft (5.0 x 5.0 x 0.76 m)
    25.5 yds³ (19.5 m³)
    1,680 lbs. (762 kg)
    Shipping Containers One 20 ft standard (4 units in one 40 ft)  One 20 ft standard (2 units in one 40 ft)  Two units in one 40 ft standard
    Operational Wind Loading
    Survival Wind Loading
    - Any position
    - At Zenith
    45 mph (72 km/h) gusting to 60 mph (97 km/h)

    125 mph (200 km/h) @ 58° F (15° C), any position; 130 mph (209 km/h) at preferential stow orientation
    n/a
    Up to 62 mph (100 km/h)

    180 mph (290 km/h) @ 58° F (15° C)
    210 mph (338 km/h) @ 58° F (15° C)
    Operational Temperature
    Survival Temperature
    +5° to +122° F (-15° to +50° C)
    -22° to +140° F (-30° to +60° C), low temperature options available
    Rain Up to 4 in/h (10 cm/h)
    Relative Humidity 0 to 100% with condensation
    Solar Radiation 360 BTU/h/ft² (1,000 Kcal/h/m²)
    Ice (survival) 1 in (2.5 cm) on all surfaces or 1/2 in (1.3 cm) on all surfaces with 80 mph (130 km/h) wind gusts
    Atmospheric Conditions As encountered in coastal regions and/or heavily industrialized areas
    Shock and Vibration As encountered during shipment by airplane, ship or truck
  • Literature

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