Installation Mode
Different installation modes are available for an ODU, depending on the type of antenna configuration.
The direct mounting method is normally adopted when a small-diameter and single-polarized antenna is used. In this situation, if one ODU is configured for one antenna, the ODU is directly mounted at the back of the antenna. If two ODUs are configured for one antenna, an RF signal combiner/splitter (hereinafter referred to as a hybrid coupler) must be mounted to connect the ODUs to the antenna. Figure 1 shows the direct mounting method.
- The direct mounting method is adopted when two ODUs with different polarization directions need to be installed on one antenna. In this situation, the two ODUs share the antenna, and an orthogonal mode transducer (OMT) must be mounted to connect the ODUs to the antenna. Figure 2 shows the direct mounting method.
The separate mounting method is adopted when a separate-mount dual-polarized antenna or big-diameter and single-polarized antenna is used. Figure 3 shows the separate method. In this situation, the single-polarized antenna can mount a hybrid coupler. That is, two ODUs share one feed boom.
NOTE: The ODU with the coaxial interface supports only the separate mounting mode
