SEDSat

USA

Students for the Exploration and Development of Space Satellite.
Also called SO-33 and Oscar 33

Launch data:

Designation	25509 / 98061B
Launch date	24 Oct 1998
Launch site	CC, LC-17A
Launch vehicle	Delta-7326-9.5 (#D261)
Mission	Telecommunications
Earth orbit:
Perigee/Apogee	574/ 1078 km
Inclination	31.5°
Period	101 min

Built by students at the University of Alabama's Huntsville campus.

Power problems started on 27 Oct 1998. Those were later solved but it was found the 2 receivers were not functional.

Specifications

Prime contractor	SEDS
Platform
Mass at launch	38 kg
Mass in orbit
Dimension
Solar array
Stabilization
DC power
Design lifetime

End of life

Out of service	since 27 Oct 1998
Cause	numerous problems made the satellite mostly unusable
Decay

Mode A transponder

Uplink	145.915 to 145.975 MHz (2 Meter band) Modulation: SSB, CW, FM, AM
Downlink	29.350 to 29.420 Mhz (10 Meter Band) Modulation: SSB, CW, FM, AM AFSK 300 bps Hf Packet Compatible telemetry downlink

Mode L transponder

Uplink	1268.175 to 1268.250 MHz (23cm band) Modulation: FSK digital data at 9.6, 19.2, 38.4 and 56 kbit/sec
Downlink	437.850 to 438.000 MHz (70 cm band) Modulation: FSK digital data at 9.6, 19.2, 38.4 and 56 kbit/sec

Data Rate: 300 bits/sec AFSK packet data 9600 bits/sec or 57,600 bits/sec
RF output per transponder will be 3 watts average and 15 watts max

Mission details:

Ejected from the Delta second stage was the SEDSAT microsatellite, built by the Huntsville, Alabama chapter of SEDS (the Students for the Exploration and Development of Space). SEDSAT has two amateur radio transponders and an earth imaging camera.

Ref: #7(JR377, #15 - update: 29.03.11