[arm-allstar] radioless node dtmf

Wed Mar 6 00:37:01 EST 2019

Jay,

 Don't get me wrong on a "onsey" basis these might be a good choice and
little to lose if you are building your own radio-less node but we need to
go out and buy 50 or a hundred and there is a lot to lose if they are not
reliable. The nice thing about the Yaesu mics is they are a simple matrix
keyboard with a series of resistors to supply specific row and column
voltages. This is decoded by the Arduino which in quantity is a less than
$3 part.  Another option we looked at that is possible with the Arduino is
to use a flat matrix keyboard mounted on the top panel with the Arduino and
then just about any non-keyboard mic would work.

*73 Doug*

*WA3DSP*

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

On Wed, Mar 6, 2019 at 12:27 AM "Jay Urish via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

> Doug,
>
> You are absolutely correct. My attitude is that everything from China is
> pure junk.
>
> Maybe the real ones would be an option though.
>
>
> On 3/5/19 11:18 PM, "Doug Crompton via ARM-allstar" wrote:
> > 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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> >>
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