Beam SD7 series User Manual page 22

Step 2a - Install the external Iridium Antenna Connection
The external antenna connection can be found at the rear of the dock on
the cable loom.
Install the Iridium antenna in an appropriate location that has a clear sky
view. Connect the RF cable between the antenna and the TNC female
connector at the rear of the DriveDOCK Extreme.
WARNING:
DO NOT pull with force on the cables from the rear of the DriveDOCK
Extreme. Install strain relief clamping for the antenna cables where
required to prevent damage to the DriveDOCK Extreme.
Correct installation of the antenna is a vital part of the DriveDOCK
Extreme system, to ensure reliable functionality, and drop-free calls.
Use only quality low-loss antenna cabling, and ensure that the
cable(s) and connectors to the antenna provide no more than 3dB
attenuation (at frequency of 1.6GHz).
NOTE:
Refer to the section "Assuring Quality of Iridium Service" for more
information on antenna placement and installation.
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