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DSP 5, 6, 7 (Phase 2)


The next block of DSP satellites was known as "Phase II." There were three satellites in this series, Flights 5 through 7, launched between 1975 and 1977. This main upgrade from the "DSP Phase I" block of satellites provided increased on-orbit design lifetime from 1.25 to 2.0 years, increasing the weight of the Phase II from 907 kg to 1043 kg, and the solar panel output from 400 to 480 Watts. This block used the same basic spacecraft, but other packages were added. The same basic sensor was still used (2000 PbS detectors) providing BTH coverage. An experimental Above-the-Horizon (ATH) array sensor was flown on Flight 6. Phase II satellites can be distinguished from DSP Phase I satellites by the two electronic packages (located 180 degrees apart) on the rim of the satellite conical section. The prime launch vehicle was still the reliable Titan-3(23)C along with a Transtage.

Nation: USA
Type / Application: Early Warning
Operator: USAF
Contractors: TRW
Equipment: ?
Propulsion: ?
Power: 4 deployable fixed solar arrays, solar cells, batteries
Lifetime: 2 years
Mass: 1043 kg
Orbit: GEO
Satellite COSPAR Date LS Launch Vehicle Remarks
DSP 5 (DSP SVN-8, OPS 3165) 1975-118A 14.12.1975 CC LC-40 Titan-3(23)C
DSP 6 (DSP SVN-7, OPS 2112) 1976-059A 26.06.1976 CC LC-40 Titan-3(23)C
DSP 7 (DSP SVN-9, OPS 3151) 1977-007A 06.02.1977 CC LC-40 Titan-3(23)C