0SIGNALINGQuiet tAlk (Qt)/ digitAl Quiet tAlk (dQt)Your dealer may have programmed QT or DQT signaling on your transceiverchannels. A QT tone/ DQT code is a sub-audible tone/code which allows you toignore (not hear) calls from other parties who are using the same channel.optionAl SignAlingYour dealer may also program several types of optional signaling for yourtransceiver channels.5-Tone Signaling: Refer to “5-TONE SIGNALING” on page 0.DTMF Signaling: DTMF Signaling opens the squelch only when the transceiverreceives a call containing a matching DTMF code.FleetSync Signaling: Refer to “Selcall (Selective calling )” on page .MDC-1200: MDC-200 is a data system using Audio Frequency Shift Keying(AFSK). Transceivers communicate at a 200 baud rate, using 200 Hz and00 Hz tones.operAtor SelectAble tone (oSt)You can change the preset encode and decode tones for the selected channel.Up to 40 OST pairs can be pre-programmed by your dealer.1 Select your desired channel.2 Press and hold the key programmed as OST.• “TONE” appears on the display, followed by the current OST number.3 Press / (if the key assignment list selection is configured as “Enabled”) or/C> to select your desired OST number.• You can also directly enter a number from 0 to 40 using the keypad.4 Use the transceiver the same as in a regular call.5 To exit OST mode and return to the preset encode/decode tones, press .5-TONE SIGNALING5-tone Signaling opens the squelch only when the transceiver receives a matchingcall. Transceivers that do not transmit the correct tones will not be heard.Note: Your transceiver functions can include either 5-tone Signaling or FleetSync/ MDC-200.mAking A SelcAll (SelectiVe cAlling)A Selcall is a voice call to a particular station or to a group of stations.1 Select your desired zone and channel.