Radio Test Spacecraft American tracking network technology satellite. Mercury-Scout 1. Small satellite was to have verified the readiness of the worldwide Mercury tracking network |
TTS American tracking network technology satellite. Tested Apollo tracking network. Experimental satellite built by TRW for NASA, USA. Launched 1967 - 1971. |
TETR American tracking network technology satellite. Test satellite for NASA's Manned Space Flight Network. |
Molniya-Yu Russian tracking network technology satellite. Study 1969. This was a modification of the Molniya-1 satellite to test deep space radio-based tracking methods for the Soviet Lunar program. |