COBHAM Sailor 250 FleetBroadband, Training Manual, Page: 42 / 270

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2
Chapter 2
Product Presentation
Figure 2-6: TT-3052A ADU, Antenna Tracking Board
• High Power Amplifier (HPA)
purpose in primary operation
is to handle the communication between the Antenna and
the BDU /Terminal. It also is amplifying the RF signals from
the satellite to an adequate level for transmission to the
BDU /Terminal and from the BDU /Terminal a RF output
signal strong enough to reach the satellite out in space.
• Secondary the HPA is transforming and distributing the power
input from the BDU /Terminal to internal use in the HPA and to
the peripheral Antenna modules. Finally it is the HPA that stores
the information regarding the type of Antenna of the SAILOR
500 FleetBroadband version A. The HPA PCB is identical in all
three antenna versions of SAILOR 500 FleetBroadband ADU,
though the metal box cover is slightly different.
Figure 2-7: TT-3052A ADU, High Power Amplifier
• Global Positioning System (GPS) module
has on the one
side a receiver /antenna and on the other side the engine /
processor. It is receiving the signals from the GPS satellites
and if more than four (4) satellites signals are available, the
GPS module can calculate a longitude and a latitude position.
The SAILOR 500 FleetBroadband system requires a GPS fix
in order to operate, as it needs to be positioned into a regional
spot beam or a narrow spot beam of the satellite. The GPS
module is identical for all five (5) SAILOR FleetBroadband
antennas (and for SAILOR 900 VSAT antenna).