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Communications and Broadcasting Engineering Test Satellite, also called Kakehashi (means bridge)


Designation 25175 / 98011A
Launch date 21 Feb 1998
Country of origin Japan
Mission Telecommunications
Geostationary orbit n/a (121°E initially planned)
Launch vehicle H2 #6

Was to demonstrate inter-orbit links and Ka-band transmissions and mobile K-band transmissions (onboard relay). Cost: $36 million

Early shutdown of the second stage left the satellite in low orbit (44 seconds out of the 192 seconds planned). The apogee motor should be used to higher the orbit and enable a few experiments on a 500/17700 km orbit). Insured for $8 million.

In Jan 1999 communications and broadcasting experiments ended. The satellite was damaged by going through the Van Allen belt. It will now be used for signal attenuation measurements and radiation influence.

External resources

sat-index articles

Technical data


Prime contractor  
Platform derived from ETS 6
Mass at launch 3900 kg
Mass in orbit 2000 kg
Dimension 2 x 3 x 3 m
Solar array 15 m span
Stabilization 3-axis
DC power EOL: 5300 W
Design lifetime 3 years

Is equipped with ETS 6's apogee motor. Has 4 Xenon thrusters

Suffered an electrical overcharge before launch.


Main transponders
Backup transponders
Power 200 W
Coverage Japan only
EIRP max  

+ S-band capacity

+ 1 transponder with uplink at 44 GHz, downlink at 476 GHz
Downlink: 22.696 GHz 20.165 GHz

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