COBHAM Sailor 250 FleetBroadband, Training Manual, Page: 56 / 270

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2
Chapter 2
Product Presentation
• 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 are available, the GPS module
can calculate a longitude and a latitude position. The SAILOR
250 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.
Figure 2-38 and 2-39: TT-3050A ADU, Global Position System antenna and engine
• High Power Amplifier (HPA) , located in the bottom of the
Bottom Radome, has the 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. In principle, the HPA is identical to the one used in the
SAILOR 500 FleetBroadband ADU, though not installed in the
box and without cooling fan.
Figure 2-40: TT-3050A ADU, High Power Amplifier
• Duplexer & Low Noise Amplifier (DLNA) , located in the
bottom of the Bottom Radome, has the purpose of amplify an
route the RF signals in both RX and TX direction. In the TX
direction it is routing the RF signal directly from the HPA to the
Pedestal through the duplexer. In the RX direction the RF signal
is routed from the Pedestal through the Low Noise Filters and
amplifier to the HPA.