OSCAR 7

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OSCAR 7
OSCAR 7
Type: Amateur radio satellite
Operator: AMSAT
COSPAR-ID : 1974-089B
Mission dates
Dimensions: 29 kg
Begin: November 15, 1974, 17:11:00 UTC
Starting place: Vandenberg AFB
Launcher: delta
Status: active
Orbit data
Rotation time : 115 min
Orbit inclination : 102 °
Apogee height :  1450 km
Perigee height :  1455 km

OSCAR 7 (also OSCAR B , AMSAT OSCAR B or AOB ) is an amateur radio satellite . It was built by radio amateurs from the AMSAT (Radio Amateur Satellite Corporation) organization.

Mission and Structure

Connection option via two satellites in a row

The satellite was launched on November 15, 1974 as a secondary payload together with the US weather satellite NOAA -4 and the first Spanish satellite Intasat with a Delta rocket at Vandenberg Air Force Base . After the successful launch, the satellite was assigned the OSCAR number 7. It is equipped with two linear transponders as well as a bulletin board, which enables radio telex and Morse code telegraphy in the partial route procedure . Electrocardiogram data for medical purposes was also transmitted experimentally via OSCAR 7 .

OSCAR 7 has the uplink in the 2-meter band and in the 70-centimeter band and the downlink in the 10-meter band and in the 2-meter band. In 1975 it was possible for the first time to operate radio communications via two satellites (uplink at 70 cm to OSCAR 7, crosslink at 2 m to OSCAR 6 , downlink at 10 m). Conversely, since a connection from OSCAR 6 to OSCAR 7 was not possible, both satellites had to be within the visibility range of the two ground stations for two-way connections .

One transponder was made in Germany, the control system in Australia.

In 1981 the satellite's battery reached the end of its life. The satellite equipped with solar cells has been working again since 2002 .

His NSSDC ID is 1974-089B.

literature

  • Joe Kasser, Jan King: OSCAR 7 and its capabilities. In: QST, February 1974, 56-60.
  • Perry Klein, Ray Soifer: Intersatellite communication using the AMSAT-OSCAR 6 and AMSAT-OSCAR 7 radio amateur satellites. In: Proceedings of the IEEE, October 1975, 1526-1527.
  • David Nelson: Medical data relay via Oscar satellite. In: Ham Radio, April 1977, 67-73.

Web links

Individual evidence

  1. ↑ a b OSCAR 7th NSSDC, accessed on May 27, 2014 (English).
  2. ↑ Paul Muri, Janise McNair: A survey of communication sub-systems for inter-satellite systems and linked CubeSat missions. In: Journal of Communications, 2012 (7), April, 290-308.
  3. ↑ Gunter Krebs: AMSAT P2B (Phase 2B, AO 7, OSCAR 7). Gunter's Space Page, accessed on May 27, 2014 .
  4. ↑ OSCAR 7 (AO-7) in space for 40 years. Retrieved June 24, 2015 .