[arm-allstar] QRM Issue

[Mike Sullivan]

I second David. No problems here using the Canakit AC adapter or a 12v-5v
converter running off our battery.

Mike

On Sat, Sep 21, 2019 at 16:04 "David McGough via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

>
> Not in my experience. Typically, RPi boards are VERY quiet, compared to
> most consumer electronics.
>
>
> 73, David KB4FXC
>
> On Sat, 21 Sep 2019, "Chris via ARM-allstar" wrote:
>
> > Aren't Pi's generally nasty anyway?
>
> Chris
>
> > On Sep 21, 2019, at 12:40 PM, David McGough via ARM-allstar <
> arm-allstar at hamvoip.org> wrote:
> >
> >
> > Hi George,
> >
> > You may want to follow up directly with George, WB3DZZ, the manufacturer
> > of the Yellow Box nodes. His website is here:
> https://technobygeorge.com/
> > He is very friendly and responsive.
> >
> > I don't personally have a Yellow Box Node, but I have systems using all
> > the hardware in one.
> >
> > Since the RFI you're experiencing is in the medium frequency bands, I
> > would expect RFI leakage from the AC power adapter to your home power
> > wiring; probably directly conducted via the AC power supply wires.
> >
> > A simple test for this would be to power the Yellow Box from a battery
> > source briefly, listening for noise. If it's gone, power from a different
> > AC power supply---like a bench 13.8V power supply, etc., and make sure
> the
> > noise is still gone.
> >
> > 73, David KB4FXC
> >
> >
> >
> >
> >> On Sat, 21 Sep 2019, "George via ARM-allstar" wrote:
> >>
> >> Hi All,
> > For the first time last night, my yellow box node is causing horrendous
> > noise when running my Perseus SDR software, especially below 3 MHz
> > (including the Broadcast Band (AM).  I discovered the noise was in
> > perfect timing to one of the flashing red LEDs in the yellow box.  As
> > soon as I unplugged the power, the noise immediately stopped.  I do have
> > ferrites, that I added last November, on the power cable.
> > I took a portable radio outside and the interference was not present.
> > The Perseus antenna is at least 30 feet from the yellow box.
> > Any suggestions?  Thanks to the HamVoip team for their continued support
> > and development of this system.
> > Good weekend to all.
> >
> > Regards,
> > George, NJ3HRedmond, Oregon USA
> > DMR ID:  3141315
> > AllStar Node:  49246EchoLink Node NJ3H-L:  3135IRLP Node:  3659
> > _______________________________________________
> >
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> >
> > Visit the BBB and RPi2/3 web page - http://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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>
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>