Intelsat III F-4
|Mission duration||5 years design life|
|Launch mass||647 kilograms (1,426 lb)|
|BOL mass||151 kilograms (333 lb)|
|Dry mass||293 kilograms (646 lb)|
|Start of mission|
|Launch date||22 May 1969, 02:00UTC|
|Launch site||Cape Canaveral LC-17A|
|End of mission|
|Perigee altitude||35,276 kilometres (21,919 mi)|
|Apogee altitude||35,670 kilometres (22,160 mi)|
|Epoch||22 May 1969|
The Intelsat III F-4 was part of the Intelsat III series which consisted of eight satellites, which were used for retransmission of global commercial telecommunications, including live TV.
The satellite was stabilized by rotation with a minus antenna structure (its antenna was 34 inches high). It had a hydrazine propulsion system with four propellers and four tanks. Passive thermal control. With solar cells producing 178W peak, nine Ahr NiCd batteries. The load consisted of two transponders that used 12 watt TWTA amplifiers for multiple access, 1500 audio circuits or four TV channels. The Intelsat III F-1 was disabled due to launch vehicle failure.