[Elecraft] KPA500 Noise While Off

[John Simmons]

My Astron RS35 does the same thing under the same conditions.

-John NI0K

Matt NQ6N wrote on 6/27/2018 1:20 PM:
> My KPA500 makes a noticeable hum/thump when the laser printer that is on
> the same circuit draws a lot of current.
>
> 73,
> Matt NQ6N
>
> On Wed, Jun 27, 2018 at 12:58 PM Jim Brown <jim at audiosystemsgroup.com>
> wrote:
>
>> On 6/27/2018 10:37 AM, Richard Wade wrote:
>>> If I had to venture a guess, I would say that somehow the unpowered
>> KPA500
>>> was picking up noise on the shack wiring.  Very strange. Is that
>> possible??
>>
>> It is if equipment in your shack is not properly bonded together, and to
>> house grounds that are also properly bonded together. Study N0AX's
>> recent ARRL book on the topic, to which I contributed, or the slides for
>> a tutorial talk I've done at several hamfests.
>>
>> http://k9yc.com/GroundingAndAudio.pdf
>>
>> 73, Jim K9YC
>>
>>
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