[arm-allstar] CM119A GPIO

[Michael Durkin]

What's the normal baud rate for packet radio ax25 that's been used for
years? ... I have used the cm108 for packet radio (DireWolf modem) and
unmodified with my SDR ... UHFSDR.



On Wed, Dec 5, 2018, 9:55 PM "Doug Crompton via ARM-allstar" <
arm-allstar at hamvoip.org wrote:

> I think you are talking about two different things. The CM108/119 is an A/D
> - D/A which supports up to about 18Khz audio. The way this is used and down
> sampled in Allstar the maximum audio frequency is about 3.6Khz which can
> pass many of the lower speed digital modes. In fact we have tested it and
> there are digital nets using it as connected Allstar. I say lower speed
> because none even approach 1200 baud. Whether you could accurately decode
> 9600 baud in a wide open audio bandwidth situation reliably is kind of
> doubtful. It certainly would not work in an unmodified radio. The CMxxx
> also has Digital I/O - the 108 has 4 bits and the 119 has 8 bits. These
> bits are not designed to pass high speed data nor is there a way to create
> a specific baud rate and ensure it is accurate. If you want to send or
> receive serial data there are several choices. One would be the Pi, it has
> bits designed for this and another is a serial to USB adapter. They are
> cheap and just work.
>
>
> *73 Doug*
>
> *WA3DSP*
>
> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
>
> On Thu, Dec 6, 2018 at 12:41 AM "Steve L via ARM-allstar" <
> arm-allstar at hamvoip.org> wrote:
>
> > Marty,
> >
> > I know Direwolf is a "soundcard" based AX.25 modem that supports 9600
> > baud and the cm108/119 chipset.
> >
> > https://github.com/wb2osz/direwolf
> >
> >
> > On Wed, Dec 5, 2018 at 11:09 AM "Marty via ARM-allstar"
> > <arm-allstar at hamvoip.org> wrote:
> > >
> > > I'm working on another project for Allstar Link. My question about the
> > CM119A GPIO can handle(tx/rx) 9600baud? I'm working on controlling a
> radio
> > module.
> > >
> > > 73,
> > > Marty KD4HLV
> > > ALLSTAR 28523
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