9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. III-2-5
Setting the Polarization
The polarization of the transmitted signal, horizontal or vertical, is determined by
the antenna. The polarization of the ODU is set to match its antenna
• Direct-Mounted ODUs: For direct-mounted ODUs, antenna polarization is set
using a polarization rotator fitted within the ODU mounting collar.
The rotator is an integral part of the antenna mount. Vertical polarization is the
default setting.
The V and H settings are indicated on the rotator head.
• Remote-Mounted ODUs are used where standard antennas are used (antennas
are not fitted with the 9500 MXC mounting collar), or where dual-polarized
antennas are installed for CCDP XPIC operation.
Antenna installation for V or H polarization is normally determined by the
orientation of the waveguide port / slot.
To remote mount an ODU, refer to Remote-Mounted ODUs on page 2-10.
Figure 2-5 illustrates antenna waveguide port (slot) orientation for vertical and
horizontal polarization settings.
Figure 2-5. Antenna Waveguide Slot Orientation for V and H Polarization
Dual Polarized Antennas
Dual polarized antennas may not be not marked for V and H, and may also
present the same orientation for both ports. However, one port should have a
straight waveguide feed into its antenna, the other should include a 90 degree
twist.
• For convention, if ports are not marked for V and H, it is recommended that the
port that has the straight waveguide feed is selected as the vertical antenna feed
port.
• Ensure the same port is selected for vertical at both ends.
Antenna installation instructions are included with all antennas. These
instructions include procedures for setting polarization.
Vertical Polarization Horizontal Polarization
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