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Alaska Satellite Facility

ASF Enterprise Ground Station

Commercial Satellite Services at a Prime Location

The ASF Enterprise provides reliable fiberoptic connectivity to the Lower 48. The ground station’s location (64.794, -147.536) is optimal for tracking polar-orbiting satellites. Its two X- and S-band antennas, providing 9-10 supports/day/spacecraft, are supported by ground station engineers with decades of experience.

Customer-Owned Equipment

ASF Enterprise maintains and hosts customer-owned equipment.

Secure and Convenient

Located near Fairbanks, Alaska, ASF provides a fenced, gated facility with 24/7 police and operator video monitoring, a state-of-the-art fire suppression system, and a generator power supply backup. Fairbanks has a commercial airport with direct flights to the lower 48, experienced local contractors, and nearby hotels and amenities. The climate is dry, and the winds are calm.

ASF2 Antenna

Antenna Technical Information

  • UAF1 Antenna (7 meter)

UAF1 Antenna (7 meter)

UAF1 antenna closeup

Key Features

  • ViaSat 3-axis antenna
  • 7.3m parabolic reflector
  • S & X-band downlink
  • S-Band uplink
  • Cassegrain configuration
  • 4 ind. Freq. channels in X-band
  • 400 Mbs per X-band channel
  • Dual polarization support in X-band
  • Model 3420 Insulated Riser
  • Model 3424 Azimuth/train pedestal
  • Series 3880 ACU
  • VHR-1200 high-rate receiver
  • 100W uplink amplifier

UAF1 X-band Telemetry Characteristics

CharacteristicValue
Frequency8000 - 8500 MHz
G/TTheoretical = 32 dB/K
Worst case A 5 deg El
PolarizationRHC or LHC
Antenna Beamwidth0.3 deg
ModulationBPSK, QPSK, OQPSK, 8PSK

Data Rates

Modulation FormatQuad-Channel Mode
2x demodulators per IF channel
Dual-Channel Mode
1x demodulators per IF channel
Binary Phase Shift Keying
(BPSK)
200 Mbps x 2 demods x 2 IF channels
(800 Mbps total)
400 Mbps x 2 IF channels
(800 Mbps total)
Quadrature Phase Shift Keying (QPSK)400 Mbps x 2 demods x 2 IF channels
(1600 Mbps total)
800 Mbps x 2 IF channels
(1600 Mbps total)
Offset Quadrature Phase Shift Keying (OQPSK)400 Mbps x 2 demods x 2 IF channels
(1600 Mbps total)
800 Mbps x 2 IF channels
(1600 Mbps total)
9 Phase Shift Keying (8PSK)600 Mbps x 2 demods x 2 IF channels
(2400 Mbps total)
1200 Mbps x 2 IF channels
(2400 Mbps total)

UAF1 S-band Telemetry Characteristics

CharacteristicValue
Frequency2200-2300 MHz
G/TTheoretical = 23 deg C
Worst case @ 0.5 deg El = 19 dB
System Noise Temperature30 K
PolarizationRHC or LHC
Antenna Beamwidth1.2.deg
Antenna Gain48 dB @ Noise 30 K
Carrier ModulationSC_AQPSK, BPSK, SGLS
Carrier Data Rate8 kbps to 128 kbps
Subcarrier Frequency1.024 MHz
Subcarrier ModulationBPSK
Subcarrier Data Rate2 kbps to 128 kbps

UAF1 S-band Command Characteristics

CharacteristicValue
Frequency2025-2120 MHz
EIRP53 dBWi
PolarizationRHC or LHC
Antenna Beamwidth1.2.deg
Antenna Gain48 dB
Output Power100 W
Carrier ModulationSGLS
Carrier Data Rate100 kbps to 1 Mbps
Subcarrier Frequency1.024 MHz
Subcarrier ModulationFSK/AM
Subcarrier Data Rate100 bps

UAF2 Antenna (9 meter)

Key Features

    • ViaSat 3-axis antenna
    • 9.1m parabolic reflector
    • X-band downlink
    • RHC polarization downlinks only
    • S-band uplink
    • Cassegrain configuration
    • Series 3880 ACU
    • Model 3316 pedestal
    • VHR-1200 high-rate receiver
    • Deicing system
    • 150W uplink amplifier
    • installed 1995/upgraded 2014
UAF2 antenna closeup

UAF2 X-band Telemetry Characteristics

CharacteristicValue
Frequency8000-8500 MHz
G/TTheoretical = 34 dB @ 23 C @ 5 deg EL
System Noise Temperature92 K
PolarizationRHC
Antenna Beamwidth0.22 deg
Antenna Gain55dBi @ 53 K

UAF2 S-band Command Characteristics

CharacteristicValue
Frequency2042-2052 MHz
EIRP38 dBWi
PolarizationRHC
Antenna Beamwidth1.1.deg
Antenna Gain42.6 dBi
Output Power50 W
Carrier ModulationLinear PM
Modulation IndexPM: 1 Radian
BPSK
Subcarrier Frequency16 kHz
Subcarrier ModulationBPSK
Subcarrier Data Rate2 kbps

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