Specifications

Maxiva ULX Series
November 11, 2013
5‐25
888‐2628‐300 WARNING:Disconnectprimarypowerpriortoservicing.
Copyright©2013,HarrisBroadcast
STEP 5 Attachaa10dBpadtoreflectedsamplecable(alongwithexistingattenuators).
STEP 6 Removethe50ohmterminatorfromtheoppositecouplerportandplaceitonthe
reflectedport.
STEP 7 Placethereflectedcable(w ith10dBpad)ontheportwheretheterminatorwas
removed.Thisessentiallyattachesthereflectedcable(with10dBpad)toaforward
sampleport.
Note
The detector level (at licensed output power) should be between 2 -3 V when the reflected cable is
attached to a forward port with a 10 dB pad. If the reflected detector voltage is too high, additional pads
must be added to get the voltage in the 2-3 V range. The added pads will stay with the reflected cable
when it is moved back to the reflected port later in the procedure. The 10 dB pad will be removed when the
reflected cable is placed back on the reflected port.
STEP 8 ClickonthecorrespondingCalwindowforSysRefldpower,openinganumericentry
box.
STEP 9 Enterthevaluethatis10%oflicensedoutputpower(inWatts).
STEP 10 ClickonDONEtostorethechanges,orCANCELtoignoreallchangesmade.Record
thereflecteddetectorvoltageforlateruseinsettingthereflectedpowerthreshold.
Note
Refer to "3.9.3.1.2 System Thresholds" on page 3-24 to get information on setting the system reflected
threshold level. This level must be set before testing the VSWR protection (reflected power trip point). The
reflected trip level should be set to the voltage level recorded in the previous step minus 100 mV.
STEP 11 Removethereflectedcablewith10dBpadfromtheforwardport.
STEP 12 Removetheterminatorfromthereflectedportandplaceitontheforwardport.
STEP 13 Removethe10dBattenuatorfromthereflectedcable.
STEP 14 Returnthereflectedcabletothereflectedport.
STEP 15 PressEnableVSWR.
STEP 16 Endofprocedure.
5.10.2.2 CalibrateReflectedCabinetPower
Cabinetreflectedpowerisnormallycalibratedatthefactoryduringfinaltestanditmaynotneedtobecalibratedin
thefield.ThecabinetreflectedtrippointhasbeensetatthefactoryandisnotaccessibleviatheGUI.Should
recalibrationofcabinetreflectedpowerberequired,anddetector
voltagesaresignificantlychangedforsome
reason,thecabinetreflectedtriplevelcanonlybeadjustedthroughuseofaterminalemulatorprogramlike
Terater m.ContactHarrisserviceifthisisneeded.
STEP 1 Repeattheaboveprocedureusingtheinternal(cabinet)forward(incident)and
reflectedcouplersamples(seeFigure5‐15onpage5‐24)tocalibratethereflected
poweratthecabinetoutput.
Note
The detector level should be approximately 2-3 V when the reflected cable is attached to the forward port
with a 10 dB pad. If there are pads on the forward port to start with they should not be included with the
added 10dB pad.
STEP 2 Enterthe10%ofthemeasuredforwardcabinetpowervalueinthewindowforCab
Refld(W).
STEP 3 Endofprocedure.