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| mission_type = Communications |
| mission_type = Communications |
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| operator = Project OSCAR |
| operator = Project OSCAR{{\}} [[U.S. Department of Defense|DoD]] |
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| website = |
| website = |
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| COSPAR_ID = 1965-016F |
| COSPAR_ID = 1965-016F |
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| SATCAT = 1293 |
| SATCAT = 1293 |
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| mission_duration = |
| mission_duration = {{time interval|9 March 1965 18:29:47}}<br/> (in orbit) |
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| spacecraft_bus = |
| spacecraft_bus = |
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OSCAR 3 was a {{cvt|15|kg}} rectangular-prism-shaped satellite, {{convert|7|x|12|x|17|in|cm|abbr=on}} in dimension. Unlike its predecessors, which could only transmit a morse code "HI" signal through their beacons, OSCAR 3 was a true communications satellite. Equipped with a [[Broadcast relay station|translator]], when the satellite received signals broadcast to it at 144.1 [[Hertz|MHz]], its translator converted them to 30 MHz for amplification, and then reconverted them to 145.9 [[MHz]] for further amplification and retransmission. A [[watt]] of power was available for transmission; if more than one signal were received simultaneously, they shared the power in proportion to their signal strengths when received. OSCAR 3 also carried a beacon like OSCARs 1 and 2, though of lower power.<ref name=popelec>{{cite magazine|url=https://www.rfcafe.com/references/popular-electronics/oscar-3-space-station-popular-electronics-march-1965.htm|title=Oscar III: Ham Radio's New 2-Meter Space Station|date=March 1965|magazine=Popular Electronics|author1=Robert N. Tellefsen|author2=Harley C. Gabrielson|volume=22|number=3|publisher=Ziff-Davis Publishing Co.}}</ref> |
OSCAR 3 was a {{cvt|15|kg}} rectangular-prism-shaped satellite, {{convert|7|x|12|x|17|in|cm|abbr=on}} in dimension. Unlike its predecessors, which could only transmit a morse code "HI" signal through their beacons, OSCAR 3 was a true communications satellite. Equipped with a [[Broadcast relay station|translator]], when the satellite received signals broadcast to it at 144.1 [[Hertz|MHz]], its translator converted them to 30 MHz for amplification, and then reconverted them to 145.9 [[MHz]] for further amplification and retransmission. A [[watt]] of power was available for transmission; if more than one signal were received simultaneously, they shared the power in proportion to their signal strengths when received. OSCAR 3 also carried a beacon like OSCARs 1 and 2, though of lower power.<ref name=popelec>{{cite magazine|url=https://www.rfcafe.com/references/popular-electronics/oscar-3-space-station-popular-electronics-march-1965.htm|title=Oscar III: Ham Radio's New 2-Meter Space Station|date=March 1965|magazine=Popular Electronics|author1=Robert N. Tellefsen|author2=Harley C. Gabrielson|volume=22|number=3|publisher=Ziff-Davis Publishing Co.}}</ref> |
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Four quarter-wave antennas (two for input/output to the translator, one for the beacon, and one for telemetry to the ground) were mounted on the sides of the lightweight magnesium-lithium alloy satellite. The hull was covered with shiny aluminum foil tape to reflect the heat of the |
Four quarter-wave antennas (two for input/output to the translator, one for the beacon, and one for telemetry to the ground) were mounted on the sides of the lightweight magnesium-lithium alloy satellite. The hull was covered with shiny aluminum foil tape to reflect the heat of the sun, and lack stripes were painted over the shiny aluminum to radiate heat away from OSCAR 3 during the times it orbited in the shadow of the earth. A large 18-[[volt]] battery powered the satellite, though the beacon was designed to continue functioning, supplied by power from solar cells and a rechargeable battery.<ref name=popelec/> |
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==Mission and results== |
==Mission and results== |
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