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6.13 DTMF
DTMF is an in-band signaling method using dual sinusoidal signals for any given code. Originally developed for telephony
systems, it has proved a very versatile tool in many other areas.
In two-way radio systems, DTMF is most commonly used for automation systems and remote control. A common example
would be in amateur radio repeaters where some repeaters are activated by sending out a DTMF sequence (usually a simple
single-digit sequence).
The BAOFENG GT-5R EU has a full implementation of DTMF, including the A, B, C and D codes. The numerical keys, as well as
the [*SCAN], and [#
] , keys correspond to the matching DTMF codes as you would expect. The A, B, C and D codes are
located in the [MENU], [▲],[▼]and [EXIT] keys respectively (†).
To send DTMF codes, press the key(s) corresponding to the message you want to send while holding down the PTT key.
If you have the keypad lock enabled on your radio, you can still send DTMF tones the regular way without having to
unlock your radio.
Chapter7. Working the MENU System
For a complete reference on available menu items and parameters, see Appendix C, Shortcut Menu operations.
Note: in channel mode, the setting of these features is not possible: CTCSS/ DCS tones, wide/narrow bandwidth, PTT-ID,
Busy channel lock out, channel name edit.
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