SN4 Specifications

Orbital Location: 101° West Longitude

C-band Transponders
Coverage: 50-state, Caribbean

Narrowband C:
12 Transponders @ 36 MHz, 8.5 watts
Amp Type: Solid State

Wideband C:
6 Transponders @ 72 MHz,
16 watts

Amp Type: Traveling Wave Tube

Variable uplink sensitivity
Amp Redundancy: 7-for-6
Receiver Redundancy: 4-for-2

Beacon Info: 3701.5 H, 4197.5 V

Launch Date: April 12, 1991
Launch Mass: 1195 kg (2635 lbs)
Launch Vehicle: Delta 7925
Length: 46 feet (arrays deployed)
Expected Lifetime: over 12 years

  Ku-band Transponders
Coverage: CONUS

16 Transponders @ 72 MHz

RF Power: 14 @ 16 watts, 2 @ 30 watts
Variable uplink sensitivity
Amp Type: Traveling Wave Tube
Amp Redundancy: 7-for-6
Receiver Redundancy: 2-for-1


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