[arm-allstar] DTMF Tones not decoding

Kerry McKenzie kermck at gmail.com
Sat Mar 30 19:16:04 EDT 2019

greetings all
i have had experience with Boafeng radios and DTMF tones I have cut and
paste this article
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Sending Accurate Baofeng DTMF Tones from the UV-5R

by KK6JYT <https://kk6jyt.com/author/adminmoller001/> | Mar 21, 2015 |
Programming <https://kk6jyt.com/category/transceivers/programming/>,
Transceivers <https://kk6jyt.com/category/transceivers/> | 1 comment

Recently I was having problems sending Baofeng DTMF tones to my IRLP board.
This only seemed to happen when I was approximately 100 yards, or more,
away from the base unit/receiving antenna.
Ask For Help

One Sunday I was listening to the WIN System Tech Net (IRLP Reflector
9100), and I inquired if anyone knew anything about this problem I was
having. Shorty (K6JSI) suggested that I may need to adjust the DTMF decoder
potentiometer inside the RX radio. Ron (WB6IAG) suggested that my IRLP
audio levels might be wrong. I continued to do more research and came
across a possible solution from the *Radio Reference website*
What Was Happening

As it turns out, the Baofeng HT radio I was using to send the DTMF tones to
the IRLP board was the problem. While pressing the PTT + DTMF key(s), the
mic does not mute. This can cause the mic to pick up any sidetones from the
speaker and will overdrive and/or distort the transmitted tone(s).
The Solution

The solution is in the Baofeng’s menu settings. The menu #16 (DTMFST)
setting needs to be set to “OFF”. This is accomplished by following the
steps below.

Press the following buttons on your Baofeng UV-5R:

Menu > 1 > 6 > Menu > 0 > Menu > Exit

I have not had any further problems since adjusting this setting in the

*Note: It is worth mentioning that SOME of the Baofeng UV-5R’s do not
transmit the DTMF tone “D”. The “0” tone is transmitted when the “Exit”
button is pressed. This is a firmware problem and can not be fixed.*

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*i hope this helps*

regards Kerry

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