Viasat 9.1m Ka-band Broadband Gateway Earth Station Antenna
| Condition: | Used and refurbished |
| Model: | VA-91-KA |
| Manufacturer: | Viasat, Inc. |
Viasat 9.1m Ka-band Broadband Gateway Earth Station Antenna
The Viasat 9.1m Ka-band Broadband Gateway Earth Station Antenna is designed for high- performance Ka-band GEO-stationary satellite applications. The shaped cassegrain reflector provides superior gain and sidelobe performance at Ka-band frequencies. Improved high precision stretch formed panels are supported by strong radial trusses attached to a large central hub, and spars support a precision machined subreflector.
All aluminium reflector materials, coated with a solar diffusive white paint, minimize thermal effects at Ka-band. The reflector back structure and subreflector spars are designed to exacting Ka-band rigidity requirements under wind and gravity loads.
The oversized hub provides an environmentally controlled, protective enclosure for sensitive electronics and ample space for equipment such as HPAs, with easy access from the large extended work platform. Locating HPAs within the hub minimizes TX path losses.
The precision steel mount delivers Ka-band pointing accuracy in adverse wind conditions. The pedestal design features a precision azimuth bearing and very low backlash for high performance.
Antenna Control Unit
ViaSat’s Antenna Control Units are ideally suited for controlling the Ka- band antenna, offering full DC servo performance and adaptive step tracking or monopulse autotrack options depending on the desired tracking accuracy. The GS site at NSC facilitates visibility of the Geo Arc from 58°E to 75°W at 5° elevation.
TECHNICAL SPECIFICATIONS
Electrical
Operating Frequency (GHz)
Receive: 17.7 – 20.2
Transmit: 27.5 – 30.0
Gain (ref feed horn)
17.70 GHz 63.0 dBi
18.95 GHz 63.6 dBi
20.20 GHz 64.2 dBi
27.50 GHz 66.4 dBi
28.75 GHz 66.7 dBi
30.00 GHz 67.0 dBi
Feed Insertion Loss (dB, 4-pt CP, tracking)
Receive: < 0.55 dB
Transmit: < 0.53 dB
Beamwidth (3 dB)
Receive: 0.12° nominal
Transmit: 0.08° nominal
VSWR (Tx/Rx)
1.25:1
Polarization
Sense: Simultaneous RHC & LHC
Axial Ratio: 1.06:1 (0.50 dB)
Pattern Envelope Compliant to ITU 580-5, FCC 25.209
Feed System
- 4-port Tx/Rx circular polarization
- TE21 tracking coupler
- WR34 Tx ports / WR42 Rx ports
- 500 W CW transmit power per port
- 85 dB Tx/Rx isolation
- 18 dB Tx/Tx and Rx/Rx isolation
Antenna Noise Temperature
Clear sky, 20° C, ref feed horn:
Elevation 17.7 GHz 20.2 GHz
10° 62K 103K
30° 30K 103K
40° 25K 39K
Note: Other 2.5 GHz wide frequency bands within 17.7 – 21.2 GHz and 27.5 – 31.0 GHz bands available.
Mechanical
Optics
Dual reflector, axis-symmetric
Mount Type
EL-over-AZ
Reflector
- Alignment: Optical Mount Type
- Diameter: 9.1 meters (30.0 ft)
- Panels: 48, precision aluminum, 2 tiers
Axis Drives Elevation
- Jackscrew: 0.2°/sec, options to 0.5°/sec
- Azimuth: Dual Drive, 0.5°/sec, options to 1.0°/sec
Antenna Travel
Elevation: 0° to 90° continuous
Azimuth: 180° continuous
Hub Enclosure
Width: 82inch (208cm) Depth: 44inch (121cm)
Environmental
Temperature
- Operational: -30°C to +55°C
- Optional Range: -40°C to +55°C
Wind
- Operational: 72 km/h gusting to 97 km/h
- Survival: 200 km/h (stow mode)
- Atmospheric Conditions: Salt, pollutants, and corrosive contaminants as found in coastal and industrial areas
- Deicing (Optional):
– Main reflector – Hot air
– Feed – Resistive heaters
– Subreflector – Resistive heaters
Connectivity
- Fiber IFL between GS and NSC
- Data Centre for onward 10G / 100G backhaul to National / International POP.
Antenna is still erected in Europe and needs to be dismantled on order. Please check our Earth Station de-installation and Re-installation services.
Viasat 9.1m Ka-band Broadband Gateway Earth Station Antenna
