SharkRF openSPOT3 - Page 50

TheIgnoreRXafterTXsettingspecifiesatimeforwhichallreceivedframesbythemodemwillbeignoredafter
thelastTXhasended.ThisisusefulifyouwanttousetheopenSPOT3tolinkarepeatertotheinternetthrough
RFandtherepeaterhasalengthyinternalbufferanditisstilltransmittingevenaftertheopenSPOT3has
finishedtransmitting(whichmeanstheopenSPOT3willstartreceivingit'sownstreamagain).
Themodem'sSensitivitylevelcanbechangedin6levels.Notethatincreasingsensitivitydecreasesthelinearity
ofthefilters,whichmayresultinincorrectlydemodulatedbits(whichmeansincreasedBER).Bydefault,
sensitivityislow(levelsetto5or6)formodemmodesusing4FSK.
Thesensitivityofthemodem'sfiltercanbechangedwiththeFiltergainsetting.Notethatincreasingsensitivity
decreasesthelinearityofthefilters,whichmayresultinincorrectlydemodulatedbits(whichmeansincreased
BER).Bydefault,filtergainissetto8.
Themodem'sAGC(AutoGainControl)isconfiguredbysoftwareforoptimalvaluesforlowBERin4FSK
demodulationmodes.However,youcanturnautomaticAGConwiththeAutoAGCsetting,butitis
recommendedtokeepthischeckboxoffsotheopenSPOT3'sAGCcanworkonit'sown.
WhentheAGCisturnedon,youcansettheAGClow/highthresholdvalues.Thesevalueswillbeconsideredas
lowandhighthresholdsfortheAutoAGCcircuitryinthemodem.
TheExternalVCOcheckboxshouldbecheckedwhenanexternalVCOisappliedtotheopenSPOT3.Currently
there'snoexternalVCOusedbytheopenSPOT3.NotethatapplyinganexternalVCOisconsideredasanafter-
marketmodificationandvoidsthewarrantyoftheopenSPOT3.
YoucanalsoresetallmodemsettingsbacktodefaultsbyclickingontheResetmodemconfigbacktodefaults
button.
Allofthesettingsabovearestoredindependentlyforeachmodemmodeinthecurrentprofile.
Modempage
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