Webersat (WO 18, Oscar 18)

Webersat (WO 18, Oscar 18) was launched on the first ARIANE ASAP flight V35 with Spot 2, on the 22. January 1990 (01:35:27 GMT) into an 780 km sun-synchronous, 98 degree inclined orbit, this 16 kg amateur radio micro-satellite was built by Weber State University Ogden, Utah in the U.S. It has a full colour CCD camera, Digital Store and Forward packet communication transponder, spectrometer, and particle impact detector. It is box shaped with dimensions of 200 x 150 x 150 mm, with four solar panels and weighs 16.03kg. Downlink frequency is 437.104 MHz SSB 1200 Baud PSK AX.25

It also carries a CCD NTSC video recorder, digitised to provide 130 by 170 mile coverage snapshots using a mechanical shutter. A piezoelectric Particle impact detector measures the micrometeorite environment. A light spectrometer employing an NEC linear CCD measures the spectrum of sunlight reflected from the atmosphere. An L-band video uplink receiver allows NTSC video uplink to be digitised. The satellite employs a V40 processor running at 9.83MHz, with 8MBytes of RAM. The ADCS systems comprises a horizon sensor using two photodiodes with 22deg field of view, a fluxgate magnetometer, permanent magnets, hysteresis coils, and black/white painted antennas for spin control similar to a "photometer".

The satellite suffered an apparent radiation induced computer failure on the 23. August 1997, which recovered in November 1997.

Nation:	USA
Type / Application:	Amateur communication, imaging
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Configuration:	Amsat-NA Microsat
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Satellite	Date	LS		Launcher	Remarks:
Webersat (Oscar 18, WO 18)	22.01.1990	Ko ELA-2		Ariane-40 H10	with Spot 2, UoSAT 3, Uosat 4, DOVE, Pacsat, Lusat