3Press [SET]totogglebetween"Lock"and"Unlock".- The default is "Lock".4 Press [MENU] to exit.BEEP TONEThedualbander beeps eachtimeyoupressakeywiththeexceptionof[MONI],[LAMP],and[PTT].Thedualbanderalsobeepstoreport analarmcondition.Beepvolumecan bevariedbytheVOLcontrols.1 Press [MENU].2 Turn the ENC control to select "Beep" (15).3Press[SET]totogglebetween"Off"and"On".-Thedefaultis"On".4 Press[MENU]toexit.FULL DUPLEXFullDuplex allows transmission on one band whilereceiving simultaneously on the other. This operationclosely resembles speaking over a telephone.Eachpressofthekeycombination[F],[DUP]switchesthe dualbanderasfollows:Full Duplex OFF Full Duplex ON(No indicator) ("DUP")Full Duplex with FeedbackPrevention ON("DUP" blinking)+FullDuplexcannotbeswitchedONorOFFwhileusingSingleBand,VHF/VHF,orUHF/UHF.Selecting SingleBandmodecancelsFullDuplexuntitDualBandmodeisselectedagain.+IfFullDuplexisalreadyON,selectingtheVHF/VHForUHF/UHFconfigurationcancelsFullDuplex.Note:WhenusingFullDuplex,connectanearphonetotheSPjack.Usinganearphonewillpreventfeedbackthatcancausethedualbandertoemitahowling sound.DISPLAYDEMONSTRATION MODE(SHOW-OFF MODE)Thedualbanderdisplays apre-programmed messagein thismode.1 Press [PTT]+[F]+POWERONtoactivate thefunction.+Wait approximately 10secondsforthepre-programmed messageto startscrollingacross the Display.2 Press[LAMP]todeactivate the function.45