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Uosat 3

Also called UO-14 or Oscar 14


Designation 20437 / 90005B
Launch date 22 Jan 1990
Country of origin United Kingdom
Mission Telecommunications
Perigee/Apogee 781/797 km
Inclination 98.6°
Period 100.7 min
Launch vehicle Ariane V35

Function: Packet Radio Mailbox and Digipeater

Since 1992 it is used by VITA (see also Gemstar)

The onboard computer failed in late 1996. It was reactivated for a few weeks for its 10th anniversary in single channel FM voice repeater mode, uplink is 145.975, and downlink is 435.070 MHz.

End of life

Out of service Aug 2003
Cause Some battery cells are dead and there is not enough power to operate

External resources

sat-index articles

Technical data


Prime contractor University of Surrey (UK)
Platform UoSAT (modular)
Mass at launch 46 kg
Dimension 0.6 x 0.34 x 0.34 m
Stabilization 3 axis
DC power EOL: 10 W
Design lifetime 3 years

Frequency chart

Uplink 9600 bps K9NG/G3RUH modulated FSK (FM) AX.25
145.975 MHz
Downlink 9600 bps K9NG/G3RUH modulated FSK (FM) AX.25
435.070 MHz
Beacon 1200 bps AFSK NBFM
435.070 MHz

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