[arm-allstar] DTMF tones not decoded properly

[Doug Crompton]

Brian,

 Since this is a homebrew project please tell me what resistors you have in
the RX path. Generally audio is taken from the high side of the volume pot
then fed to pin 21 of the DMK URI. I forget if that is what you are using
for a FOB? The 'B' boost item in simpleusb-tune-menu needs to be enabled.
Something is not right if you need to be at 999 and you are directly
connected from that point in the radio to the FOB. You should be able to
achieve a 5khz level on the item 2 bar graph with a setting of around
500-700.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*

On Fri, Mar 29, 2019 at 8:56 PM "B Harvey via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

> Don,
>
>     I checked the codeplugs for the radios I've been using. All are set to
> wideband so I don't think I have a problem there. In the simple USB tune
> menu I checked the levels and with the default settings, for RX, I was
> barely moving the "VU" meter. Even when I increased the setting to 999, I
> didn't get much more that 1/3 of the way to the 3khz mark. However, after
> raising it to 999, I could get proper decodes of all of the numeric digits
> in the CLI menu. My next step was to remove the 4.7Kohm resistor in the RX
> line as shown in the UV 82 node radio tutorial on Hamvoip. That seemed to
> make no difference at all. Even though I get proper decodes in CLI, they
> still don't resolve to working commands over the Allstar network. Any other
> suggestions? As I mentioned earlier, pre-emphasis and de-emphasis are
> currently disabled.
>
> Brian / KK6DOQ
>
> On Fri, Mar 29, 2019 at 1:18 PM "Don Backstrom - AA7AU via ARM-allstar" <
> arm-allstar at hamvoip.org> wrote:
>
> > On Fri 29-Mar-19 11:37, "B Harvey via ARM-allstar" wrote:
> > > I can't test actual
> > > levels or wide / narrow mode so I'll have to wait until I get home to
> try
> > > those out.
> >
> >         From our tech write-up: "If you are having issues ... and are
> > experiencing audio levels or DTMF decoding/encoding difficulties, use a
> > service monitor to check to see if the module is actually programed to
> > Wideband mode"
> >
> > > 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.
> >
> >         That obviously can also give you issues. Also remember *low*
> power.
> >
> >         Doug and David are the experts here, especially on all the other
> > settings. I'm just an interested HamVoip user chiming in on DTMF, as we
> > did battle with those issues for quite some time before discovering the
> > 818 probs and others like issues.
> >
> >         One other note on DTMF: on many HTs when you PTT and then key
> your
> > DTMF
> > code in you get output from your HT speaker - which *can* lead to real
> > feedback probs as your mike is open and listening during PTT. Find the
> > setting and disable tone output from DTMF entry. Also, watch your
> > background noise/conversation/etc at anytime you are using PTT even if
> > just to key in DTMF - you're OTA!
> >
> >         Good luck,
> >
> >         - Don - AA7AU
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> >
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