[arm-allstar] hum on my allstar nodes

[Chris Smart]

Thanks Doug.


What is typically the source of this hum? Wall-wart type power supplies?

73


Chris



On 4/26/2020 10:46 AM, "Doug Crompton via ARM-allstar" wrote:
> Hum on local RF nodes is a common problem when transmitting TO your node.
> It is usually because you are too close to your node. If the hum stops when
> you move to another location, sometimes just a foot or two one way or the
> other then that is probably the problem. It happens more often when using
> antennas that are mounted on the node itself. One way to get rid of it is
> to use those small mag mount antennas that have 10-15 feet of coax and get
> it away from your operating position or use an outdoor antenna. Other than
> that there is no filtering or other way to eliminate it. If the hum is
> constant at any location even walking hundreds of feet away then it is not
> this phenomenon.
>
> *73 Doug, WA3DSP*
> *http://wa3dsp.org <http://wa3dsp.org>*
>
>
>
> On Sun, Apr 26, 2020 at 4:08 AM "Jed Barton via ARM-allstar" <
> arm-allstar at hamvoip.org> wrote:
>
>> Hey guys,
>>
>> So i'm sure i'm not the only 1 with this problem. I've got all my
>> allstar pies plugged in.  They each have their own power supply. It's
>> the typical wall wart.  They all produce a nice little hum that's just
>> annoying.
>> I'm sure a lot of you guys have delt with this.  You hear it on the
>> node transmitter such as the Shari.  Any ideas for getting rid of it,
>> or reducing it?
>>
>> Cheers,
>>
>> Jed
>> _______________________________________________
>>
>> ARM-allstar mailing list
>> ARM-allstar at hamvoip.org
>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>>
>> Visit the BBB and RPi2/3/4 web page - http://hamvoip.org
>>
> _______________________________________________
>
> ARM-allstar mailing list
> ARM-allstar at hamvoip.org
> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>
> Visit the BBB and RPi2/3/4 web page - http://hamvoip.org