US Communications and Navigation Satellites JAPANESE

1.Communications satellites

Passive Communication Relay Satellite ECHO 1 Diameter 30 meters. （USA, 1960, SC#1173）

Active Communication Relay Satellite Relay 1 Transponders were aboarded on this satellite. See Relay Stamps Corner （Guinia, 1972, SC#C120)

Telstar See Telstar Stamps Corner （France, 1962, SC#1048)

First Geostationary Communications Satellite Syncom 3 See Syncom Stamps Corner Later INTELSAT started tts oeration.INTELSAT Corner （Romania, 1965, SC#1712)

Geostationary Communications Satellite SBS-4 　SBS-4 was released from Space Shuttle in 1984 　　(Angola, 1999, SC#1115a）

2.Navigation Satellite

Transit Navigation Satellites aboard extremely precise clocks. They send position data of themselves and precise time. Ground users receive signalｓ more than 4 Navstars and calculate their own global positions. (Angola, 1999, SC#1110e）

Navstar(GPS) （Ciskei, 1992, SC#192)

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