[arm-allstar] DMK URI mic in

[Doug Crompton]

Simon,

  If you are using the DMK-URI then yes you would either need to amplify
the mic or maybe use pin 9. I never had to use that but it looks from the
schematic that pin 9 goes directly to mic_in of the CM119. If that is the
case then a mic should work there. It would not hurt to try it and check
with simpleusb-tune-menu and check the rx input level. If there is any DC
component on the mic you would have to use a blocking cap.

I used a modified sound FOB for the one on the web page and its mic in
worked fine so I suspect it will on the DMK-URI also if you bypass the
internal voltage divider.  See the schematic on the DMK website.



*73 Doug*

*WA3DSP*

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

On Sun, Dec 11, 2016 at 9:19 PM, "Simon Keys via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> Thanks Doug.  A couple of quick follow ups:
> - Do I need a mic level to line level preamp for pin 21?  Because that pin
> is labelled Audio In, Line Level.
> - What is the purpose of pin 9?
>
> Regards
> Simon ZL1OE
>
>
> On Sat, Dec 10, 2016 at 6:17 PM, "Doug Crompton via arm-allstar" <
> arm-allstar at hamvoip.org> wrote:
>
> > Simon,
> >
> >   Mic out should go to pin 21.  The speaker to 22 through an amplifier.
> The
> > grounds can connect together. Also remember that PTT from the mic goes to
> > COS on the URI. You do not use PTT coming FROM the URI. You also need to
> > wire power from the FOB +5 to the mic and you could also use it to power
> an
> > amplifier for a speaker. See the radioless node howto from the
> hamvoip.org
> > web page. -
> >
> > https://hamvoip.org/hamradio/USBFOB_without_radio/
> >
> >
> >
> > *73 Doug*
> >
> > *WA3DSP*
> >
> > *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
> >
> > On Fri, Dec 9, 2016 at 3:27 PM, "Simon Keys via arm-allstar" <
> > arm-allstar at hamvoip.org> wrote:
> >
> > > Hi all, hope you are well.
> > >
> > > I am building a radioless node and having a few challenges getting the
> > mic
> > > to work. I'm using the Alinco EMS-57.
> > >
> > > Should I wire the mic out (Pin 1) to Pin 9 or Pin 21 of the URI?
> > >
> > > And do I need to use the separate "mic ground" (Pin 7) and if so do I
> > just
> > > short that to the chassis/cable ground?
> > >
> > > Many thanks for the help you provide the Allstar community.
> > >
> > > Regards
> > > Simon ZL1OE
> > > _______________________________________________
> > >
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> > > arm-allstar at hamvoip.org
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> > >
> > > Visit the BBB and RPi2/3 web page - http://hamvoip.org
> > >
> > >
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> >
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> >
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