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6.8 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).
DTMF frequencies and corresponding codes
1209Hz 1336Hz 1477Hz 1633Hz
697Hz
1
2
3
A
770Hz
4
5
6
B
852Hz
7
8
9
C
941Hz
*
0
#
D
The radios has a full implementation of DTMF, including the A, B, C and D codes.
The numerical keys, as well as the
, and
, keys correspond to the matching DTMF codes as you would expect. The A,
B, C and D codes are located in the
,
,
and
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.
6.9 Customization
The radio allows you to define visual and audible features such as Display Illumination Time, MR/Channel Mode Display
Format, Power On Message, Power On password, Keypad Beep, Roger Beep, Voice Prompt, etc. to suit your usage habits.
6.9.1 Display backlight (ABR) - MENU 7
In standby mode, press
+ 7. The screen will display “
ABR ”.
Press
key to enter the function. Press the
/
keys to select the always on/required delay time
(ON/5sec/5sec/10sec/15sec/20sec) the backlight of the display, then press
key to confirm.
To return to the standby mode press
key.
