12345678910111213141516171819202158DUAL TONE MULTI-FREQUENCY (DTMF) FUNCTIONSThe following DTMF functions require the MC-53DM orMC-45DM (option) microphone. The keypad on themicrophone includes the 12 keys found on a push-buttontelephone plus an additional 4 keys (A, B, C, D). Theseadditional keys are required for various control operationsby some repeater systems.MAKING DTMF CALLS1 Press and hold Mic [PTT].2 Press the keys in sequence on the keypad to sendDTMF tones.• The corresponding DTMF tones are transmitted.• Your transceiver remains in the transmit mode for 2seconds after you release each key. So you can release[PTT] after beginning to press keys.n Autopatch (U.S.A. and Canada)Some repeaters in the U.S.A. and Canada offer aservice called Autopatch. Autopatch allows you toaccess the public telephone network by sending DTMFtones. Some repeaters require a special key sequenceto activate Autopatch. Check with the repeater controloperator.n Mic Keypad Confirmation TonesWhen pressing the desired keys on the Mic keypad, thisfunction produces feedback tones for your confirmation.1 Press [MNU] to enter Menu mode.2 Turn the Tuning control, or press Mic [UP]/[DWN],to select Menu No. 16 (Microphone).3 Press[sssss], then select Item No. 6 (DTMF Monitor).4 Press[SET] to toggle the function ON or OFF(default).5 Press [MNU] again to exit Menu mode.1336Freq. (Hz) 147712091471633697770852941ABCD2580369#PWRPWRVOL SQLCALLCALL12
