User's Manual

3.6 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).
1209Hz 1336Hz 1477Hz 1633Hz
697Hz 1 2 3 A
770Hz 4 5 6 B
852Hz 7 8 9 C
941Hz * 0 # D
The radio has a full implementation of DTMF, including the A, B, C and D codes.
NOTE
The numerical keys, as well as the [* ] and [# ] keys correspond to the matching DTMF codes. The A, B, C
and D codes are located in the [MENU],[UP],[DOWN] and [EXIT] keys respectively.