Specifications

Baofeng UV-5R
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Chapter 7. DTMF
DTMF is an in-band signalling 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).
Table 7.1. DTMF frequencies and corresponding codes
1209 Hz 1336 Hz 1477 Hz 1633 Hz
697 Hz 1 2 3 A
770 Hz 4 5 6 B
852 Hz 7 8 9 C
941 Hz * 0 # D
The Baofeng UV-5R 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.
(≤ BFB231) [MENU]=A, [▲]=C, [▼]=B, [EXIT]=D
(≥ BFB238) [MENU]=A, [▲]=B, [▼]=C, [EXIT]=D
(all firmware) The DTMF side tone that is heard for 'D' is '0'