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Amsat, also known as Echo, is an American amateur communications microsatellite satellite that will relay amateur transmissions.

Amsat contains an FM repeater with both a 144 MHz and 1.2 GHz uplink and 435 MHz and 2.4 GHz downlinks. Additionally it contains a digital subsystem that transmits TLM on 70 cm and provides complete PACSAT BBS that can be configured on both V and S band uplinks. There is also a 10 meter PSK uplink.

Amsat has four VHF receivers, two UHF transmitters, six modems, 56 channels of telemetry. The two UHF transmitters are conneced to four antennas, two in right-hand circular polarization and two in left-hand circular polarization.

Alternate Names

  • Echo
  • 28375
  • OSCAR 51

Facts in Brief

Launch Date: 2004-06-29
Launch Vehicle: Dnepr
Launch Site: Tyuratam (Baikonur Cosmodrome), Kazakhstan
Mass: 11.14 kg

Funding Agency

  • Unknown (United States)


  • Communications

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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