Comtech-ef-data PCB-4000 Instrukcja Użytkownika Pobierz pdf (Strona 17)

PCB-4000 1+1 Phase Combiner Revision 2

Introduction MN/PCB4000.IOM

1–3

TheblockdiagramsshowninFigure1‐2depictthemajorcomponentsofthe1:1phasecombined

system.(ThesediagramsemployComtechEFDataHPODs–HighPowere dOutdoorAmplifiers–as

thedesignatedSSPAs.)



The PCB‐4000 1+1 Phase Combiner Control Box (PCCB) contains a microprocessor‐based M&C

circuitboardtocontrolthesystem.Interconnectionisasfollows:



• ThePCCB commu

nicates with each SSPA via control cables that are attached from the

PCCB“SSPACOM1|J2”and“SSPACOM2|J3”connectorstoeachSSPA.



• It is also through this con nection that the PCCB receives it prime power to operate. A

+24V signal fr

om each SSPA is diode OR’ed to provide redundant operating power for

thePCCB.



• A“Y”cableconnectstothe“SSPASWOUT|J5”connectorforcontrolofthewaveguide

switches.MonitorandControl(M&C)communicationwiththePCCBisaccompli shedvia

the“SYSTEMCOM|J1”connector.



Note:Inordertoavoidam

biguities,allcommunicationtoeachSSPAisalsoaccomplishedviathe

PCCBM&C.



The PCCB provides a weatherized housing for the necessary input RF components. System

interconnectionisasfollows:



• Aninput RFredundancyswitch,controlled viath

e“RF INPUTSWITCH |J6” connector,

selectswhichRFpathisdirectedtotheoutput.



• The output RF signal is fed into an in‐phase divider, which equally splits the signal in

phase and amplitude to the “SSPA 1 OUT | J9” and “SSPA 2 OUT | J10”

outputconn

ectors.



o The RF path to the “ SSPA 1 OUT | J9” output connector contains a manually

adjustablephaseshifter;thisphaseshifter isusedtoequalize thephasedifference

ofeachSSPAsignalpathtoachievemaximumsystemoutputpower.Itisaccessible

via a small co

ver panel. This critical component is factory set and should only be

adjusted,ifneeds arise,bycarefullyfollowinganappropriatealignmentprocedure–

seeChapter3.INSTALLATION,STARTUP,

ANDTROUBLESHOOTINGPROCEDURESfor

furtherinformation.



o TheRFpathtothe“SSPA2OUT|J10”outputconnectorcontainsalengthofcoaxial

cablethatisfactorymanufacturedtoprovideequalphaselengthpathsfromtheRF

inputtoeachPCCBoutputwhentheadjustablephaseshifterissettoitsmidp

oint.

Thisprovidesamaximumadjustablephaserange.



There are also several isolators inside the PCCB that maintain good system Voltage

StandingWaveRatio(VSWR).YoushouldnotalteranyRFcableinside(oroutside)ofthe

boxthatispartoftheRFsignalpath.

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