Kenwood TM-251A Instruction Manual

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Call/VFO ScanA scan function that allows alternate monitoring of theCall channel and the current VFO frequency. Thecurrent VFO frequency is the frequency selected or usedlast while in VFO mode. See "Scan".Channel DisplayAfunctionthatshowsonlythememorychannelnumberon the display insteadofboththefrequency andthememorychannelnumber.CO (Carrier-operated) ScanWhenscanning, scan stopsatallcarriersreceived andresumes2secondsafterthecarrierstops.CTCSS(Continuous Tone CodedSquelch System)Also referredtoasToneSquelch.A methodofreceiversquelchcontrolthatusesasubaudibletonesuperimposedbythe transmitter on thetransmittedsignal.Onlysignalsreceivedwithasubaudibletonethatmatchesthetone selectedatthe receiver canopenthereceiver squelch.CTCSS frequencyThe subaudible frequencies used by CTCSS.Default settingsThevalues selectedforVFOfrequency,Callchannelfrequency,FrequencyStep,etc.bythetransceiverafteritisreset.Alltransceiversareshippedfromthe factorywith default settings.Display ModeThis function allowsyoutocustomizehowtheinformationthatappearson theDisplayispresented.DTMF(DualToneMulti-Frequency)signalAsignalcreatedby combiningtwodiscrete audiofrequencies. Generally usedforsendingdigitsforrepeatercontrolorAutopatchapplications.DTSS (Dual Tone Squelch System)Asquelchcontrolsystemthat reliesonaburstofdatafromthe transmittertoopenthereceiver squelch.Onlywhenthetransmittedcode matchesthecodeprogrammedinthe receiverwillthesquelch open.DTSS Transmit DelayThedelayintentionallyintroducedatthe transmittertodelay transmissionofDTSScodesafter[PTT]ispressed. The delay can improvethereliabilityofDTSSwhen communicatingwith areceiver with slow responsetime.109