Re: DTMF tones not recognized


If a transmitter is off by 1 or 2+ kHz of TX frequency, that may cause an issue also. Check with a frequency counter the accuracy of the 3 different transmitters.








From: David Cameron - IRLP
Sent: May 14, 2020 10:30 AM
Subject: Re: [IRLP] DTMF tones not recognized


This is not a common problem, but it creeps up from time to time.


What radio are you using for the node radio? What audio source are you

using in the radio? If the source is not a squelched, de-emphasized

source, then the DTMF decoder is not able to decode due to the variance

in levels in the tones.


What audio output are you using from the node radio? If it is a

discriminator source, that is the problem.


Also, if the level of the audio from the node radio to the node is

either very high or very low, it can affect the ability for the decoder

to work. What is the input audio settings like on the alsamixer screen?


David Cameron



On 2020-05-14 9:13 a.m., Albert Febraro wrote:

> This may be a common issue but being new to IRLP I'm still fine tuning

> my node and learning. The issue is that when I send DTMF tones from

> different radios the node does not recognize the tones. I have one radio

> (Kenwood TH-F6) that when I transmit tones the node doesn't decode them

> at all, however another radio (Alinco DJ-MD5) works perfectly. What is

> interesting is that when I'm using my mobile radio (ICOM ID-5100) I can

> bring up the echo node 9993, but cannot disconnect. I send a "73" but I

> only hear the 7 when the node returns the echoed audio. My audio levels

> are adjusted correctly as far as I can tell. I then have to disconnect

> with a different radio. When I use the Alinco HT, I get good reports

> audio and received audio is fine.

> Al


> node 3913





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