[Elecraft] KPA500 Noise While Off

[Bob McGraw K4TAX]

Seems that the AC line supplying the equipment has a rather high impedance thus allowing the voltage to suddenly drop under the dynamic load and then surge to a higher than normal value. 

A dedicated 120V and/or 240V service should be considered for the station power. 

Laser printers do draw considerable power when they start. 

Bob, K4TAX


Sent from my iPhone

> On Jun 27, 2018, at 2:00 PM, John Simmons <jasimmons at pinewooddata.com> wrote:
> 
> 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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