Kenwood TM-251A Instruction Manual

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CONTINUOUSTONECODED SQUELCH SYSTEM(CTCSS)The CTCSS feature is available only when the TSU-8CTCSS unit is installed.CTCSS functions by using subaudible tones that aresuperimposed by a transmitter on a transmitted signal tocontrol a receiver’s squelch. When used in combinationwith the noise squelch, CTCSS provides a simplemethod to selectively choose which stations will beheard. This transceiver offers a total of 38 standardizedCTCSS frequencies.MonitoringislesstiringwhenusingCTCSSsinceyouhear onlythosestations onaparticularfrequencythataretransmittingtheCTCSStonethatyouhaveselected.SELECTING CTCSS FREQUENCIESRefertothe chartoffrequenciesavailableandtheprocedureforselecting thedesiredfrequencyonpage52.74USING CTCSSToswitchON CTCSS,repeatedlypress[TONE/CTCSS]until"CTCSS"appearsonthe Display.Eachpressof[TONE/CTCSS]changestheDisplayasbelow:No indicator ——-» TONE ——» CTCSSSubaudible tone not transmittedand tone squelch not functional.No indicatorTONECTCSSSubaudible tone transmitted.Subaudible tone transmitted andtone squelch functional. Thisindicator does not appear if theCTCSS unit is not installed.Note:>WhenusingDTSSorPagewithCTCSS,thesquelch opensonlyifthecorrectCTCSStoneisreceived andthereceivedDTSSorPage code matchesthecodestoredinyourtransceiver.»IfCTCSSand ToneAlert areON,thereisnospeakeroutputexceptthealarm tone evenifasignalisreceivedwith thecorrectCTCSSfrequency.