Spacenet 3R

USA

Launch data:

Designation	18951 / 88018A
Launch date	11 Mar 1988
Launch site	Ko, ELA-1
Launch vehicle	Ariane-3 (V21)
Mission	Telecommunications
Geostationary orbit:

Specifications:

Prime contractor	GE Astro Space
Platform	GE-3000
Mass at launch	1195 kg
Mass in orbit	692 kg
Dimension	1.63 x 1.32 x 0.99 m
Solar array	14.33 m span
Stabilization	3 axis
DC power	BOL: 1530 W
Design lifetime	10 years

Location:

Begin	End	Position
L: 11 Mar 1988	Sep 1997	87°W
Oct 1997		83°W

End of life

Out of service	Dec 1999
Cause	deorbited

Spacenet′s C-band

Main transponders	12+6
Backup transponders	2+1
Power	(12+2) transponders of 8.5 W (TWTA) (6+1) transponders of 16 W (TWTA)
Bandwidth	8.5 W transponders: 36 MHz 16 W transponders: 72 MHz
Coverage
EIRP max	36 dBW
Polarization	linear H/V

Spacenet′s Ku-band

Main transponders	6
Backup transponders	1
Power	16 W (TWTA)
Bandwidth	72 MHz
Coverage	CONUS
EIRP max	44 dBW
Polarization	linear H

Carries one L-band transponder previously used by Qualcomm Inc. for a localization service. Now and since 1993 Mobile Datacom Corporation has been leasing the transponder.

Ku-band transponder frequency chart (GHz):

Horizontal Downlink	Transponder	Vertical Uplink
11.740	19	14.040
11.820	20	14.120
11.900	21	14.200
11.980	22	14.280
12.060	23	14.360	West spot
12.140	24	14.440	East spot

Astrophilately covers:

Launch cancel Kourou. Credit: #411

Launch cancel Kourou, ESA cover. Credit: #411

Headquarter cancel Paris. Credit: #411

Tracking station cancel Balliot. Credit: #411

Tracking station cancel "Leblond". Credit: #411

Ref.: #15, #411 - update: 17.11.19

Home