[arm-allstar] tone twist

[Tim Sawyer]

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 DougWA3DSPhttp://www.crompton.com/hamradio
> <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 certain
> radios. I can clean it up some what with a higher frequency response from
> the node radio but then
> the 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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