C.3 Considerations For Changing Antenna Parameters - Radwin 2000+ SERIES User Manual

Considerations for Changing Antenna Parameters
C.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:
• per band/regulation
• per channel bandwidth
• 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:
maxAvailableTxPower
AntennaGain CableLoss maxRegTxPower
– +
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.
•
•
•
The inequality (*) above is always satisfied by the system in accordance with the relevant
regulation.
The precise relationship between the items in inequality (*) is as follows:
• Required Tx Power (per radio) will be adjusted down to the lesser of the value entered
and maxAvailableTxPower
• Tx Power (system) is maxAvailableTxPower + 3 (for 2 radios)
• Max EIRP is maxRegEIRP.
RADWIN 2000+ Series User Manual

min maxRegEIRP
(

To see the relationship between Tx Power (radio) and Tx Power
(system), note that dBm
double the power in milliWatts (for two radios) then dBm will

increase by
10 log 2
10
The Max EIRP level will be automatically set according to the
selected band and regulation.
The EIRP level is the sum of the System Tx Power and the Antenna
Gain minus the Cable Loss.
Release 4.2.40
... (*)
)

milliWatt
= 10 log
10

.
3
so that if you
C‐3