Insat 3B

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General

Designation	26108 / 00016B
Launch date	21 Mar 2000
Country of origin	India
Mission	Telecommunications and meteorology
Geostationary orbit	83°E
Launch vehicle	Ariane V128

Launch cost: $83 million. Insurance paid $22 million for some unknown partial failure aboard the satellite.

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End of life

Out of service	Mar 2011
Cause	moved to the junk orbit

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External resources

sat-index articles

Technical data

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Lyngsat transponder loading

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EIRP coverage (dBW)

S-band
C-band
Ku-band

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G/T coverage (dB/K)

S-band
C-band
Ku-band

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Specifications

Prime contractor	ISRO
Platform	INSAT 3
Mass at launch	2070 kg
Mass in orbit
Dry mass	970 kg
Dimension	1.93 x 1.7 x 1.65 m
Solar array	14.7 m span
Stabilization	3-axis
DC power	1700 W ? (24 Ah Ni-Cd battery)
Design lifetime	12 years

Has a 440 Newton liquid apogee motor. Two deployable and 3 fixed antennas.

No meteorological payload

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S-band

Main transponders	1
Backup transponders
Power
Bandwidth
Coverage	India and most of the hemisphere
EIRP max	40.34 dBW
G/T max	4.2 dB/K
Polarization
Frequencies	uplink forward: 6.450-6.470 GHz downlink forward: 2.500-2.520 GHz downlink return: 2.680-2.700 GHz

For Mobile Satellite Service

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Transponder frequency chart (GHz)

Uplink	Downlink	Transponder
2.6745		1
2.6855		2

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Extended C-band

Main transponders	12
Backup transponders
Power	15 W
Bandwidth	36 MHz
Coverage & EIRP max	India 44.3 dBW
G/T max	3 dB/K
Polarization
Frequencies	uplink: 6.735-6.975 GHz downlink: 4.510-4.750 GHz

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Transponder frequency chart (GHz)

Horizontal Uplink	Horizontal Downlink	Transponder	Vertical Downlink	Vertical Uplink	Remarks
		to S-band		6.460
	4.530	13H		6.755
6.755		13V	4.530
	4.570	14H		6.795
6.795		14V	4.570
	4.610	15H		6.835
6.835		15V	4.610
	4.650	16H		6.875
6.875		16V	4.650
	4.690	17H		6.915
6.915		17V	4.690
	4.730	18H		6.955
6.955		18V	4.730

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Ku-band

Main transponders	3
Backup transponders
Power	55 W
Bandwidth	2 x 72 and 1 x 77 MHz
Coverage	India
EIRP max	50 dBW
G/T max	5.7 dB/K
Polarization
Frequencies	uplink: 14.25-14.5 GHz downlink: 11.45-11.70 GHz

Beacon: 11.6995 GHz

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Transponder frequency chart (GHz)

Uplink	Downlink	Transponder	Bandwidth
14.2925	11.4925	1	77 MHz
14.3750	11.5750	2	72 MHz
14.4550	11.6550	3	72 MHz

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