Model 7.2m Cassegrain Antenna

Model 7.2m Cassegrain Antenna
Satcom Antennas
Description
The General Dynamics SATCOM Technologies 7.2-meter
antenna delivers exceptional performance for transmit/
receive and receive only applications in L through DBSband frequencies. This antenna offers a reflector design that
incorporates precision-formed panels, truss radials and hub
assembly. It features an innovative Cassegrain feed and
subreflector design which results in high gain, low noise
temperature, high antenna efficiency and excellent rejection
of noise and microwave interference. A large center hub
provides spacious accommodation for equipment mounting.
The reflector is supported by a galvanized elevation over
azimuth kingpost 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 FCC and ITU-RS-580 sidelobe
specifications and Intelsat (F3, E3) and Eutelsat (L, S1)
requirements.
Options
„„ L, S, C, X, Ku and DBS-band feed configurations
„„ C/Ku receive only feed systems
„„ Specialized feed systems (e.g., extended, multi-band)
„„ CP/LP manual or remote switchable feeds
„„ Antenna control system with tracking
„„ Reflector and feed deicing systems
The Strength to Perform
All-aluminum reflector with fully interchangeable components
Designed for 1.5 to 18 GHz operation, meeting FCC and ITU-RS580 requirements
Galvanized steel elevation over azimuth pedestal with jackscrews
„„ Environmental hub configurations
„„ Integrated transmit cross-axis kits
„„ Integrated LNA or LNB systems
„„ HPAs, converters and M&C systems
„„ Load frame mounts
„„ Packing for sea and air transport
„„ Turnkey installation and testing
Upgrades
„„ X-band low PIM reflector/feed configurations
Survives 125 mph winds in any position
„„ Extended azimuth travel
„„ High wind configuration
„„ Low operating temperatures
„„ High power configurations
Model 7.2m Cassegrain Antenna
Technical Specifications
Electrical (1)
Frequency (GHz)
Antenna Gain, Midband dBi (2)
VSWR
Pattern Beamwidth (2)
-3 dB, at midband
-15 dB, at midband
Antenna Noise Temperature
5° Elevation
10° Elevation
20° Elevation
40° Elevation
Typical G/T (dB/K) (3)
4.000 GHz, 30 K LNA
11.725 GHz, 70 K LNA
Axial Ratio
Power Handling (total)
Cross Polarization Isolation
On Axis
Within 1.0 dB beamwidth
Port to Port Isolation
Rx/Tx (Rx frequency)
Tx/Rx (Tx frequency)
Sidelobe Performance
RF Specification
C-Band 4-Port
Circular Polarized
Receive
Transmit
3.625 5.850 4.200
6.425
48.10
51.70
1.25:1
1.25:1
0.67°
1.41°
0.45°
0.94°
C-Band 4-Port
Linear Polarized
Receive
Transmit
3.625 5.850 4.200
6.425
48.10
51.80
1.25:1
1.25:1
0.67°
1.41°
0.44°
0.92°
Ext. C-Band 4-Port
Linear Polarized
Receive
Transmit
3.400 5.850 4.200
6.725
48.00
51.80
1.30:1
1.30:1
0.67°
1.41°
52 K
43 K
37 K
35 K
50 K
40 K
35 K
33 K
53 K
44 K
39 K
37 K
29.8
30.0
29.6
0.50 dB
0.50 dB
10 kW CW
10 kW CW
30.8 dB
30.8 dB
30.8 dB
30.8 dB
35.0 dB
30.0 dB
35.0 dB
30.0 dB
0 dB
-85 dB
-70 dB
0 dB
0 dB
-85 dB
-50 dB
0 dB
975-1039
975-1256
0.43°
0.90°
Ku-Band 4-Port
Linear Polarized
Receive
Transmit
10.700 13.750 12.750
14.500
56.50
58.10
1.30:1
1.30:1
0.23°
0.48°
0.20°
0.42°
35.0 dB
30.0 dB
0 dB
-70 dB
-85 dB
0 dB
Meets ITU-RS-580, FCC
975-1790
0.23°
0.48°
87 K
74 K
65 K
61 K
76 K
61 K
51 K
48 K
35.2
36.1
10 kW CW
35.0 dB
30.0 dB
DBS-Band 4-Port
Linear Polarized
Receive
Transmit
10.700 17.300 12.750
18.400
56.90
59.60
1.30:1
1.30:1
0.17°
0.36°
2 kW CW
2 kW CW
35.0 dB
35.0 dB
35.0 dB
35.0 dB
35.0 dB
35.0 dB
35.0 dB
30.0 dB
0 dB
-85 dB
-70 dB
0 dB
0 dB
-85 dB
-75 dB
0 dB
975-2182
975-2179
(1) All values are at rear feed flange. (2) C-band Rx values are at 4 GHz. (3) Typical G/T at 20° elevation with clear horizon using single bolt-on LNA to feed.
Mechanical/Environmental (4)
Kingpost Pedestal (KX120)
Kingpost Pedestal (KX200)
High Wind Kingpost Pedestal (KX180-HW)
Antenna Diameter
7.2 meters (23.66 feet)
Antenna Type
Cassegrain design
Reflector Construction
16 precision-formed aluminum panels with heat-diffusing white paint
Foundation (L x W x D)
Cleaned and brightened aluminum back-up structure
Galvanized steel back-up structure
Hub Dimensions
60 in (152 cm) OD, 36 in (91 cm) depth
70 in (178 cm) OD, 36 in (91 cm) depth
Mount Configuration
Elevation over azimuth pedestal, constructed of galvanized A36 steel
Drive Type
Manual jack screws
Azimuth Travel
120° continuous
200° (2 segments @ 120°)
180° (2 segments @ 95°)
Elevation Travel
0 to 90° continuous
0 to 90° continuous
0 to 90° continuous
Foundation (L x W x D)
16.5 x 16.5 x 2.0 ft (5.0 x 5.0 x 0.61 m)
26.5 x 26.5 x 2.5 ft (8.1 x 8.1 x 0.76 m)
Concrete
20.2 yds³ (15.5 m³)
65.0 yds³ (49.7 m³)
Reinforcing Steel
1,980 lbs. (900 kg)
8,335 lbs. (3,781 kg)
Shipping Containers
One 40 ft standard
Two 40 ft standard
Operational Wind Loading
45 mph (72 km/h) gusting to 60 mph (97 km/h)
Up to 62 mph (100 km/h)
Survival Wind Loading
Any Position
125 mph (200 km/h) @ 58° F (15° C)
180 mph (290 km/h) @ 58° F (15° C)
At Zenith
n/a
210 mph (338 km/h) @ 58° F (15° C)
Operational Temperature
+5° to +122° F (-15° to +50° C)
Survival Temperature
-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
(4) Some specifications may vary based on the combination of equipment, options and/or upgrades ordered.
2600 N. Longview Street • Kilgore, TX 75662 USA • Tel: (903) 984-0555 • Fax: (903) 984-1826 • Email: kilgore-sales@gdsatcom.com
Website: www.gdsatcom.com
655-0023B, 6/08
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