[arm-allstar] DTMF tones not decoded properly

B Harvey bharveytwo at gmail.com
Fri Mar 29 14:37:37 EDT 2019


    I did log in to my node remotely to check a few settings. Pre-emphasis
and de-emphasis are both disabled. RX gain is enabled. I can't test actual
levels or wide / narrow mode so I'll have to wait until I get home to try
those out. Another thing that occurred to me is that perhaps I'm too close
to the node when I'm transmitting from my HT and I may have some de-sense
thing going on. Obviously a few things to test when I can lay hands on

Brian / KK6DOQ

On Fri, Mar 29, 2019 at 11:21 AM "Don Backstrom - AA7AU via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

> On Fri 29-Mar-19 09:19, "B Harvey via ARM-allstar" wrote:
> > I don't remember if I confirmed wideband operation.
>         Best double-check that. Narrowband can give you real
> hard-to-diagnose
> DTMF issues. We've had DTMF problems with our "Chili" units based on the
> SA818 chips:
>         "One other serious issue we discovered during our design and
> testing
> was that all of the SA-818/DR-818 Modules we tested have their
> Wide/Narrow Band command locked in the Narrow Band mode from the factory
> and will not actually program to wideband. No error is returned when
> programming, the module just stays in narrow-band! So after literally
> months of discussion with the manufacturer, we finally were able to
> acquire a programmer and the appropriate firmware for the modules to
> make them perform as expected."
>         Apparently no one else had reported this difficult-to-discover
> issue to
> the manufacturer. We definitely spent some time chasing our tails on
> this one. Bottom line: never assume! As a great man once said: Trust,
> but verify.
>         HTH,
>         - Don - AA7AU
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