[arm-allstar] QRM Issue

[David McGough]

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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> 
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> 
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> 
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