Radwin 2000 - Considerations for Changing Antenna Parameters

RADWIN2000UserManual Release2.8.30 F‐4
ConsiderationsforChangingAntennaParameters
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mus tbesatisfied:
...(*)
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.
Notes
• ToseetherelationshipbetweenTxPower(radio)andTxPower(sys‐
tem),notethat sothatifyoudouble
thepowerinmilliWatts(fortworadios)thendBmwillincreaseby
.
• 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.
• 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.
maxAvailableTxPower min maxRegEIRP
AntennaGain CableLoss maxRegTxPower+–
(
)

dBm 10 milliWatt
10
log=
10 2 3
10
log