[arm-allstar] Issues with DMK URIx USB

[Gervais Fillion]

RF effects is a world in itself,and dangerous.
reminds me of a radio site where i add an APRS node and so much interference INSIDE the building from divers equipments like microwaves links that

i imagined a simple solution too shield my equipments,i baught an old micro-wave oven and installed my radio,tnc and power supply inside it,add a fan and bingo it worked no 1.

the tech were always surprised too see my microwave oven in the bay!!! 😊


i dont think that the TYT or the PI loved the rf fields effect that you add.

73/s

gervais ve2ckn


________________________________
De : ARM-allstar <arm-allstar-bounces at hamvoip.org> de la part de "Doug Crompton via ARM-allstar" <arm-allstar at hamvoip.org>
Envoyé : 22 décembre 2018 21:13
À : ARM Allstar
Cc : Doug Crompton
Objet : Re: [arm-allstar] Issues with DMK URIx USB

Indoor antennas especially running 5W or more can cause issues. First of
all most antennas were designed to have a ground plane which they often do
not have inside. Also inside antennas often have considerable SWR so there
is radiation not just from the antenna but also from the transmission line
and back to the emitter.  You might be able to solve your problem with
ferrites on the leads. The USB and audio leads from the URI even the coax
to the antenna. Also wrapping the leads in a tight circle and not leaving
long lengths to act as receive antennas is suggested.


*73 Doug*

*WA3DSP*

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

On Sat, Dec 22, 2018 at 4:55 PM "Kyle Krieg via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

> David,
>
> After a large amount of testing, I think your on to something.
>
> I did transmit into a dummy load and no issues were present.
>
> Not sure your aware, but the TYT transmits at 10W at it's lowest power,
> which is way more than I need.  The antenna is 10ft from the radio and Pi,
> which I suspect it the issue.
>
> I'm pushing all my RF into a dummy load for now to see if that helps the
> issue with the TYT, or it's back to the Baofung 888 at a 1/2 watt to help
> solve the issue.
>
> Kyle
>
>
> On Sat, Dec 22, 2018 at 3:40 PM David McGough <kb4fxc at inttek.net> wrote:
>
> >
> > Kyle,
> >
> > My suspicion is either an RFI condition that occurs when transmitting, or
> > perhaps a ground loop.
> >
> > Have you tried transmitting into a dummy load and looking for these
> > errors?
> >
> > 73, David KB4FXC
> >
> >
> >
> > On Sat, 22 Dec 2018, "Kyle Krieg via ARM-allstar" wrote:
> >
> > > All,
> > >
> > > I've recently had issues with my DMK URIx USB with misc errors when
> > > transmitting.  It has been working fine for months and now these errors
> > > started happening.  Had to take a screen shot of the errors as I could
> > not
> > > get them to display when SSH'ed into the Pi.
> > >
> > > https://photos.app.goo.gl/uCU9bTpGTTWPBp92A
> > >
> > > I'm running a Pi with the hamvoip image into the URI with a TYT9000 as
> > the
> > > radio.
> > >
> > > Things I have tried.
> > >
> > > Swap out Pi
> > > Change power supply
> > > Rebuild the Pi node with a fresh image
> > > Swap out the URI for another URI
> > > Swap out the USB cable from Pi to the URI
> > > Check the connections to/from the URI to the radio
> > >
> > > Only thing I have not changed is the radio, which I would not think
> would
> > > be bad in this situation.
> > >
> > > Do I have a bad URI?
> > >
> > > Kyle
> > > _______________________________________________
> > >
> > > 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
> > >
> >
> >
> _______________________________________________
>
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>
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>
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