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Launch Date: 1711 UTC, 15 November 1974, Vandenberg AFB, CA.
Orbit type: Circular LEO
Stabilization: Passive magnetic
Beacons: 29 MHz; 145 MHz; 435 MHz, 400 mW; 2304 MHz, 100 mW.
Transponders: Mode A 2 watts, Mode B.
Telemetry: 24 channels, CW; 60 channels Baudot RTTY.
Power: 15 W solar array, NiCd battery.

Notes: Launched with NASA Itos-G weather satellite. Operational lifetime 6.5 years (before battery failure). "Mode C" (low power Mode B) and "Mode D" (recharge) were also defined. Complex telemetry system including CW Morse and RTTY outputs. Early demonstrations of low-budget medical data relay and doppler location of ground transmitters for search-and-rescue operations were done using this satellite.

"Oscar News: Oscar 7 - It Works!", K1ZND, QST, January 1975, p. 49.
"Oscar 7 and Its Capabilities", Joe Kasser, G3ZCZ/W3 and Jan King, W3GEY, QST, February 1974, p. 56.
"The Satellite Experimenter's Handbook", 1st edition, Martin Davidoff, K2UBC, American Radio Relay League, Newington, CT, 1985.
"OSCAR at 25: The Amateur Space Program Comes of Age", Jan King, W3GEY, et al., QST, December 1986, p. 15.

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