[arm-allstar] tone twist

[Doug Crompton]

As Tim said loud PL can be a culprit as well as very annoying. The PL filter is on by default in simpleusb.conf on the BBB and RPi2 images. Make sure it is still on. Also if you download and run iaxrpt in windows and connect to your node you have a good way to look at levels.  I have seen PL levels at almost half scale. When it is that high you can usually hear it on a handheld.
If you suspect PL might be a problem temporarily turn it off on the node radio and handheld and use just noise squelch to see if it makes a difference.

73 Doug
WA3DSP
http://www.crompton.com/hamradio


Date: Mon, 9 Nov 2015 06:45:40 -0800
From: tisawyer at gmail.com
To: arm-allstar at hamvoip.org
Subject: Re: [arm-allstar] tone twist

PL will interfere with TT decoding. Be sure that PL is filtered either by the radio or the channel driver. 
On Sun, Nov 8, 2015 at 7:52 AM, Doug Crompton <doug at crompton.com> wrote:



Eric,

 First no there is not any equalization in the code other than pre and deemphasis. It is important to have the radio and SW matched in that respect. That is if you are using deemphasized audio from the radio then you would not use it in the SW.
Generally when the pre/deemphasis is set incorrectly it effects more than one DTMF digit and the audio sounds either exceptionally bright with a lack of lows or very muddy with a lack of highs.

In generally when everything is set correctly there is no problem with DTMF detection. In my experience it has always been either a setting or radio issue. Make sure the pre/deemphasis and levels are correct. Also note that many (especially Chinese) radios have their own DTMF issues.

I suspect you already are doing this but you can view the detected DTMF digits in the Asterisk client -  asterisk -rvvv  - at the Linux prompt..  

73 Doug
WA3DSP
http://www.crompton.com/hamradio


Date: Sun, 8 Nov 2015 15:18:27 +0000
From: n7jys at yahoo.com
To: arm-allstar at hamvoip.org
Subject: [arm-allstar] tone twist

I've noticed on some of the nodes I've built, I having problem decoding the dtmf 3 key with certainradios. I can clean it up some what with a higher frequency response from the node radio but thenthe audio starts sounding kinda tinny. Just wandering if anyone else has experienced this problem.Is there a tone twist adjustment that I can experiment with to help in decoding DTMF? Thanks!   Eric (N7JYS) Marshall's Communications
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Tim


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