[arm-allstar] radioless node dtmf

[Doug Crompton]

Jay,

  That's a good price but I would be leery of anything taged Motorola for
this price. It is probably a clone and there is a lot of junk out there. It
turns out using the Arduino in conjunction with the Yaesu mic's has a lot
of advantages like being able to monitor your DTMF and also having four
additional special function keys. It is actually a 4X5 matrix.


*73 Doug*

*WA3DSP*

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


On Wed, Mar 6, 2019 at 12:10 AM "Jay Urish via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

> Doug,
>
> Have you ever looked at the motorola mics? They do encode DTMF.
>
>
> https://www.ebay.com/itm/Microphone-AARMN4026B-DTMF-for-Motorola-Radio-CDM1250-CDM1550-CDM1550LS-CDM750/292196846880?hash=item44084a0d20:g:8wsAAOSwdOlcXY~L
>
>
>
> On 3/5/19 8:55 PM, "Doug Crompton via ARM-allstar" wrote:
> > We are about to release our complete radio-less node and in a production
> > setting finding an inexpensive  DTMF mic that has real DTMF out and works
> > well is almost impossible. The clones are often junk. We started off with
> > Alinco mics and the ones offered on the Internet are Chinese clones and
> > unreliable using DTMF. We ended up using a Yaesu mic and an Arduino to
> > decode the voltage matrix from the mic and create DTMF tones. It works
> very
> > well but is not something the average user would want to do.
> >
> > If you are building your own on a "onesey" basis you should be able to
> find
> > a mic - Kenwood, Alinco, etc. that works. For a powered mic you need 5V
> to
> > the mic.  I know some say 8V but all you need is 5V and that is all you
> are
> > going to get over USB anyway. See the pin out for your particular mic.
> Keep
> > in mind that many mics do NOT encode DTMF.  Yaesu and icom especially.
> They
> > either send voltage levels or a data stream to the radio and the DTMF is
> > created there. So not all mics will work for the DTMF audio directly out
> > which you need. Levels are very important for DTMF. Go into the Asterisk
> > client and observe the keys being decoded as you push them. They
> obviously
> > should all work. In some cases you may need to open the mic and set the
> > DTMF level internally if there is a pot to do that.
> >
> >
> > *73 Doug*
> >
> > *WA3DSP*
> >
> > *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
> >
> >
> > On Tue, Mar 5, 2019 at 3:00 PM "Alan Matthews via ARM-allstar" <
> > arm-allstar at hamvoip.org> wrote:
> >
> >> hi group
> >>
> >> a bit of a dumb question, but I'll ask anyway.
> >>
> >> I have just finished a radioless allstar node, is there anyway to use
> DTMF
> >> tones for linking. I'm using my icom mike from my 5100. The only way of
> >> connecting as far as I can tell is via allmon.
> >>
> >> thanks Alan
> >>
> >>
> >>
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