13Advanced OperationDTMF OperationDTMF tones (Dual Tone Multi Frequencies) are the tones you hear when dialing from atelephone keypad. The FTM-7250DR transceiver can transmit the DTMF codes by usingthe keys on the microphone or recalling registered number strings from memories.The maximum of 16-digit DTMF codes can be registered in up to 10 memory channels.It is convenient to register telephone patch numbers, and network linking sequences tothe DTMF memory channels.Note: The two combined frequencies of the DTMF tone transmitted for each key areindicated in the following table:1209 Hz 1336 Hz 1477 Hz 1633 Hz697 Hz 1 2 3 A770 Hz 4 5 6 B852 Hz 7 8 9 C941 Hz ] 0 # DTransmitting a DTMF code manuallyYou can generate DTMF tones during transmission manually.1. Press and hold the [MHz(SETUP)] key to enter theSet mode.2. Rotate the DIAL knob to select “DT AUTO 16”.3. Press the [MHz(SETUP)] key momentarily, andthen rotate the DIAL knob to select “MANUAL”.4. Press and hold the [MHz(SETUP)] key to save the new setting and exit to normal op-eration.5. While pressing and holding PTT, press the desired DTMF characters ([0] to [9], []], [#],or [A] to [D]), sequentially on the microphone keypad.6 Release PTT.While transmitting the DTMF code, transmission status is sustained even when PTT isreleased.