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TacSat 1



TacSat was designed to experimentally test and develop tactical communications concepts for all US military services. The mission evaluated the feasibility of using satellite communication repeaters with small surface terminal communication equipment for highly mobile land, sea and air forces. This project was led by the USAF Space and Missile Systems Organization (SAMSO). It was a cylindrical shaped aluminum structure with passive thermal control. It was spin stabilized (54 rpm) to 0.1 deg using new gyrostat technique. Body mounted solar cells generated 980 W max.

The vehicle carried two transponders, one at X-band and one at UHF. The X-band transponder had a bandwidth of 10 Mhz and a maximum RF power of 30 watts. The UHF transponder has a bandwidth of 10Mhz and a maximum RF output of 230 watts. Provision was made for cross strapping the UHF and X-band up and downlinks with a reduced usable bandwidth of 425 kHz. Earth coverage horn antennas were used at X-band, bifilar helices were used at UHF.

Alternate Names

  • 03691
  • TacSat1

Facts in Brief

Launch Date: 1969-02-09
Launch Vehicle: Titan III-C
Launch Site: Cape Canaveral, United States
Mass: 640 kg
Nominal Power: 980 W

Funding Agency

  • Department of Defense-Department of the Air Force (United States)


  • Surveillance and Other Military

Additional Information

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



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