TDRS 8, 9 & 10 specifications

Prime contractor Hughes
Platform HS-601 modified
Mass at launch 3180 kg
Mass in orbit 1670 kg
Dry mass 1500 kg
Dimension stowed: 2.7 x 3.4 x 8.4 m (8 meters with the antenna folding)
Solar array 21 m span
Stabilization 3-axis
DC power 2300 W
Design lifetime 11 years

The 2 main (east-west) antennas are steerable single-access antennas that can simultaneously transmit and receive at S-band and either Ku- or Ka-band, supporting dual independent two-way communication. The selection of Ku- or Ka-band communications is done on the ground. Receive data rates are 300 megabits/second at Ku- and Ka-band, and 6 Mbps at S-band. The spacecraft carries additional capability for Ka-band receive rates of up to 800 Mbps. Transmit data rates are 25 Mbps for Ku- and Ka-band, and 300 kilobits/second for S-band. In addition, an S-band phased array antenna can receive signals from five spacecraft at once, while transmitting to one. There is no C-band on these satellites.

NASA required to be reimbursed for failures of those 3 satellites. Contract worth $481 million

Telemetry: 2211.5 MHz (0.5, 1 or 4 kbps)
Telemetry: 2206.5 MHz (0.5, 1 or 4 kbps)
Telemetry: 13731 MHz
Command: 2035.96 or 2031.81 MHz (2 kbps)
Command: 14786 MHz (+ 15150 MHz)

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