[arm-allstar] DTMF tones not decoded properly

[B Harvey]

Doug,


   This is the link to the Hamvoip.org  tutorial for using an Baofeng UV 82
as a node radio. ( https://hamvoip.org/hamradio/UV82_mod/ )According to it,
there is a 4.7Kohm resistor in series with the lead to Pin 21. I confirmed
this and measured the resistance to confirm before I removed it. (FYI,
there's also one in series with the transmit line. I thought something
seemed off as well. I would have expected plenty of gain especially with
the setting at 999 and no resistor. Although I've disconnected the speaker,
I have checked the volume with a lapel/mic and all seems normal. This was a
working radio and I hadn't detected any problems prior to setting it up as
a node radio. I did a resistance check of all of the DB25 pins to radio
solder points. I'm within  a few percent of 4.7Kohms on the RX and TX lines
and about 2 ohms on the ground. Since the PTT and COS are working, I didn't
measure those. I suppose the tutorial could be wrong and I'm on the ground
side of the volume pot but I'd expect no signal at all from there.


Brian / KK6DOQ

On Fri, Mar 29, 2019 at 6:14 PM "Doug Crompton via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

> 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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> > >
> > _______________________________________________
> >
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> >
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> >
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