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 <[email protected]>
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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