Asiasat 4

---

General

Designation	27718 / 03014A
Launch date	12 Apr 2003
Country of origin	China
Mission	Telecommunications
Geostationary orbit	see below
Launch vehicle	Atlas 3B #140

Cost: $220 million. Insured for launch and first year in orbit.

Was planned for late 1999, but was delayed because of the Asian crisis. Construction started in Sep 2000. Quite similar to Asiasat 3S.

---

Location

Begin	End	Position
L: Apr 2013	Dec 2017	122°E
Feb 2018		38°E
Aug 2021	Jan 2022	38.2°E inclined
May 2022		147.5°E inclined

---

External resources

sat-index articles

Technical data

---

Lyngsat transponder loading

---

EIRP coverage (dBW)

C-band
Ku-band Australia
Ku-band North Asia

---

G/T coverage (dBW)

C-band
Ku-band North Asia

---

Specifications

Prime contractor	Hughes
Platform	HS-601HP
Mass at launch	4137 kg
Mass in orbit	2500 kg
Dimension	stowed: 3.4 x 3.5 x 5.8 m
Solar array	26.2 m span
Stabilization	3-axis
DC power	BOL: 9500 W
Design lifetime	15 years

Command omni beam: 6.6685 V, 6.4265 RHCP GHz
Command spot beam: 6.6685 V GHz

---

C-band

Main transponders	28
Backup transponders	6
Power	55 W (TWTA)
Bandwidth	36 MHz
Coverage	1 single beam: Asia, the Indian subcontinent, the Middle East and Australia
EIRP max	40 dBW
G/T max	North Asia: 8.5 dB/K Australia: 5.0 dB/K
SFD	-98 dBW/m² (at G/T = -1 dB/K)
Polarization	linear H/V

Omni beacons: 4.19825 H & 4.19925 H GHz
Spot beacons: 4.19825 H & 4.19925 H GHz

---

Transponder frequency chart (GHz)

Horizontal uplink	Horizontal downlink	Transponder	Vertical downlink	Vertical uplink
	3.640	1B		5.865
5.885		1A	3.660
	3.680	2B		5.905
5.925		2A	3.700
	3.720	3B		5.945
5.965		3A	3.740
	3.760	4B		5.985
6.005		4A	3.780
	3.800	5B		6.025
6.045		5A	3.820
	3.840	6B		6.065
6.085		6A	3.860
	3.880	7B		6.105
6.125		7A	3.900
	3.920	8B		6.145
6.165		8A	3.940
	3.960	9B		6.185
6.205		9A	3.980
	4.000	10B		6.225
6.245		10A	4.020
	4.060	11B		6.265
6.285		11A	4.080
	4.140	12B		6.305
6.325		12A	4.160
	4.120	13B		6.345
6.365		13A	4.140
	4.160	14B		6.385
6.405		14A	4.180

---

Ku-band 1 (FSS)

Main transponders	16
Backup transponders	4
Power	140 W (TWTA)
Bandwidth	10 x 54 MHz 6 x 33 MHz
Coverage	2 beams: 1 for China & 1 for Australia and New Zealand
EIRP max	53 dBW
G/T max	6 dB/K
SFD	-100 dBW/m² (at G/T = 7 dB/K)
Polarization	linear H/V

---

Ku-band 1 transponder frequency chart (GHz)

Horizontal uplink	Horizontal downlink	Transponder	Vertical downlink	Vertical uplink	beam
	12.280	1B		14.028	North
14.048		1A	12.300		North/South
	12.340	2B		14.088	North
14.108		2A	12.360		North/South
	12.400	3B		14.148	North
14.168		3A	12.420		North/South
	12.460	4B		14.208	North
14.228		4A	12.480		North/South
	12.520	5B		14.268	North
14.288		5A	12.540		North/South/Steerable
	12.580	6B		14.328	North
14.348		6A	12.600		North/South/Steerable
	12.640	7B		14.388	North
14.408		7A	12.660		North/South/Steerable
	12.700	8B		14.448	North
14.468		8A	12.720		North/South/Steerable

---

Ku-band 2 (BSS)

Main transponders	4
Backup transponders	2
Power	140 W (TWTA)
Bandwidth
Coverage	HongKong
EIRP max
G/T max
SFD
Polarization	RHCP
Frequencies	14/11 GHz

---