MSAT 1
This satellite is a twin of
AMSC 1.
Both satellites were ordered at the same time (with separate contracts). Both
operators will provide complementary mobile telephone, radio, data, and
positioning service to land, aviation, and maritime users. Each operator also
will provide the other with backup and restoration capacity.
Operated by
MSV
Lost 2 transponders in 2003, all traffic was transfered on
AMSC 1.
Begin
|
End
|
Position
|
L:
20 Apr 1986
|
|
|
May
1996
|
Aug
2007
|
106.5°W
|
Aug
2007
|
Oct
2015
|
106.5°W,
inclined
|
Oct
2015
|
Oct
2020
|
107.5°W,
inclined
|
Out
of service
|
Sent
to junk orbit
|
Cause
|
Nov
2020
|
sat-index articles
Prime
contractor
|
SPAR
Hughes (bus) and SPAR Aerospace (payload)
|
Platform
|
HS-601
|
Mass
at launch
|
2830
kg
|
Mass
in orbit
|
1700
kg
|
Dimension
|
2.5
m x 3.5 m x 7.9 m
|
Solar
array
|
20.96
m span
|
Stabilization
|
3-axis
|
DC
power
|
BOL:
4000 W
|
Design
lifetime
|
12
years
|
Springback antennas: 6.7 x 4.9 m x 20 kg. For launch the 2 antennas as rolled
together into a 4.9 m high cone shape atop the satellite. Made of graphite
Main
transponders
|
16
|
Backup
transponders
|
4 |
Power
|
38
W (SSPA)
|
Bandwidth
|
|
Coverage
|
North
America (4 spot beams)
Alaska and Hawaii (1 beam)
Caribbean (1 beam)
|
EIRP
max
|
57
dBW
|
Total bandwith: 3200 x 5 KHz
Each beam transponder is equipped with eight surface acoustic wave filters
covering the 29 MHz L-band allocation, allowing selection of filters to math
traffic needs and to coordinate with other international users. Frequency reuse
is incorporated between the North American east and west beams. The beams are
combined into two L-band power pools, one covering the east and central beams,
and the other covering the remaining service areas. Each power pool is
generated by a hybrid matrix amplifier assembly.
In Mar 2004 the FCC granted the use of additional spectrum for 2 years:
1625.5-1645.5 MHz & 1530-1544 MHz.
Main
transponders
|
2 |
Backup
transponders
|
2 |
Power
|
100
W (TWTA)
|
Bandwidth
|
24
MHz
|
Coverage
|
CONUS,
Caribbean, Canada, Alaska and Hawaii
|
EIRP
max
|
36
dBW
|
Polarization
|
linear
V
|
Frequencies
|
10.760-10.910
GHz
|
The downlink frenquencies can be mapped to: 10.760, 10.790, 10.820, 10.850,
10.880 or 10.910 GHz.
Beacon: 11.70275 MHz