User's Manual

RFCommissioning
114
Turnonthespectrumanalyzer,makesureitisconnectedtotherightportontherightBIUandthenfindthe
frequency.Areasonablespanis1MHzandthereceiverbandwidthcanbesetto30kHzorsimilar.Usethemarkerto
measurethepeakofthesignal. Thengotothenextscr
eenontheremoteunit,theRFStatusscreen.
WhatwearelookingforhereistheTesttoneLevel.Notethisdownaswell,nexttothefrequencyofthetesttone
younotedearlier.
Thencheckyou
rspectrumanalyzer.Assumingyourtesttonelevelis‐62,6dBmasinthisexampleyourspectrum
analyzermayshow‐58,2dBm.CalculatingthenetgainbetweentheRUandtheBIUwillthenyield‐58,2‐‐62,5=4,3
dB.SubtractthecouplerbetweentheBIUandtheradiobasestationwhichinthisex
amplewas15dBandweget‐
19,3dBasournetgain.
Wewanted‐10dBsoweha
ve9,3dBtoolowgain.Weshouldthenincreasethegainandthebestplacetodothis
wouldbeintheremoteunitbysettingthegainat35+9,3=44,3whichwewillroundto44dB.
Thatuplinkisnowfinishe
dandwewillrepeatthesettingsforallofouruplink,oneatatime.
CAUTION
TurnOffTestTone
Donotforgettoturnoffthete sttonewhenyouaredonewithyouruplink.Bettercheckoneextratime.Theywill
otherwiseinterferewiththenormaloperationofthesystembycausingnoisetothebasestation.