You'll find exactly these suggestions in the tutorial at the link I posted.
73, Jim K9YC
On Mon,4/11/2016 6:29 AM, Myron Schaffer wrote:
One thing I have noticed over the years is that the near-field noise
is present with most any modern electronics. The switching frequency
is between 200-300kHz and can be easily sniffed with a pocket AM radio
(harmonics of that fundamental switching frequency are easily spotted
with an AM radio). When I bring my CCrane Pocket Radio in the near
field at the operating position, I can’t tune in the semi-local 600
KCOL out of Greely, CO. If I back up a few feet the noise level drops
considerably and the station is audible again. The CC Pocket Radio has
a fairly good front end with somewhat good selectivity but is still
overloaded with IBOC noise.
I have battery chargers, an old Dell 1501 laptop, an external HD with
switcher, the list goes on. Common mode noise and strong near-field
noise is the bane of my ham radio existence in this RFI rich environment.
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