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TTS, TETR, TATS (Test And Training Satellite) were four very small magnetically stabilized satellite instrumented with a s-band transponder to provide training to Apollo ground stations.

Its external configuration was an octahedron, 28 cm on each side. It was powered by solar cells mounted on the octahedron surfaces and nickel cadmium batteries. The instrumentation included the 9.5 Watt s-band transponder, a PAM/FM/PM telemeter encoder and 100 milliwatt VHF transmitter. The spacecraft was built by Thompson Ramo Wooldridge, Inc. (TRW).

Nation: USA
Type / Application: Experimental
Operator: NASA
Contractors: TRW
Equipment: S-band transponder
Configuration: Octahedron (ORS Mk.3)
Propulsion: None
Power: Solar cells, batteries
Mass: 20 kg
Orbit: 289 km × 459 km, 32.91 (#1); 379 km × 934 km, 32.87 (#2); 400 km × 571 km, 33.08 (#4)
Satellite COSPAR Date LS Launch Vehicle Remarks
TTS 1 (TETR 1, ERS 30) 1967-123B 13.12.1967 CC LC-17B Delta-E1 with Pioneer 8
TTS 2 (TETR 2, ERS 31) 1968-100B 08.11.1968 CC LC-17B Delta-E1 with Pioneer 9
TTS 3 (TETR 3, ERS 32) 1969-F12 27.08.1969 CC LC-17A F Delta-L with Pioneer E
TTS 4 (TETR 4, ERS 33) 1971-083B 29.09.1971 CC LC-17A Delta-N with OSO 7


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