[arm-allstar] DTMF tones not decoded properly

[B Harvey]

Doug,

  I forgot to mention, my USB sound interface between the radio and the RPi
is a DMK URI purchased new this past Christmas.

Brian / KK6DOQ


On Fri, Mar 29, 2019 at 9:08 PM B Harvey <bharveytwo at gmail.com> wrote:

> 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
>> > > _______________________________________________
>> > >
>> > > ARM-allstar mailing list
>> > > ARM-allstar at hamvoip.org
>> > > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>> > >
>> > > Visit the BBB and RPi2/3 web page - http://hamvoip.org
>> > >
>> > _______________________________________________
>> >
>> > ARM-allstar mailing list
>> > ARM-allstar at hamvoip.org
>> > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>> >
>> > Visit the BBB and RPi2/3 web page - http://hamvoip.org
>> >
>> _______________________________________________
>>
>> ARM-allstar mailing list
>> ARM-allstar at hamvoip.org
>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>>
>> Visit the BBB and RPi2/3 web page - http://hamvoip.org
>>
>