User's Manual

2-7
User Manual PN 84468 Rev I
Broadband Active Antenna (BAA)
The BAA is a separate unit that connects to the Terminal Unit through a single coaxial cable.
DC power, RF transmit and receive signals, control data and GPS data are communicated
between the BAA and Terminal Unit through the single coaxial cable.
Figure 2-8 Broadband Active Antenna (BAA) Unit for Certus 350 and Certus 200 Systems
RF COAXIAL CABLE INSTALLATION CONSIDERATIONS
Good quality RF coaxial cable is recommended. Several considerations must be taken into
account concerning the cable when installing a MissionLINK system. These include:
• RF Cable loss - The MissionLINK system is designed to operate with an RF cable loss
of 10 dB or less in the L-band frequency of operation (1616-1626 MHz). Thales
accessory cables listed below have been selected to meet this criteria.
• DC losses due to cable resistance (inner conductor and shield) - The MissionLINK
system is designed to work with a maximum total RF cable ohmic resistance of 1.10
Ohms round-trip (inner conductor and shield). Thales accessory cables listed below meet
this criteria.
• Cable length - The maximum cable length that the MissionLINK can operate with is 50
meters due to the delay requirements of the system. The maximum Thales cable length
accessory cable is 50 meters in length.