Single at One Site, Dual Antennas at the Other
In this mode, one of the sites uses the ODU with a single antenna while the other site uses
the ODU with a dual antenna.
The advantages of this mode - in comparison to using a single antenna in both sites - are
double the total Tx power and additional polarization and/or space diversity (depending on
the polarization of installed antennas).
The air rates used in this mode are the same as when using single antennas in both sites.
8.3.3 Considerations for Changing Antenna Parameters
Let:
• max Available Tx Power denote the maximum Tx Power practically available from an
ODU. (It appears as Tx Power per Radio.)
• maxRegEIRP denote the maximum EIRP available by regulation. It will be
determined by three factors:
o per band/regulation
o per channel bandwidth
o antenna gain
• maxRegTxPower denote the maximum regulatory Tx Power for the equipment, also
having regard the above three points.
Then, the following relationship must be satisfied:
* The above inequality is always satisfied by the system in accordance with the
relevant regulation.
The precise relationship between the items in the inequality is as follows:
• Required Tx Power (per radio) is adjusted down to the lesser of the value entered
and maxAvailableTxPower
• Tx Power (system) is maxAvailableTxPower + 3 (for 2 radios)
• Max EIRP is maxRegEIRP
The Tx Power (per radio) indicates the power of each radio inside the ODU and is used for
Link Budget calculations.
The Tx Power (system) shows the total transmission power of the ODU and is used to
calculate the EIRP according to regulations.
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