[Elecraft] RFI/EMI and dealing with it

[Joshua Gould]

Greetings,

I am the relatively new owner of a KX3 and I've discovered somewhat of a
problem:  The switching power supplies that supply power to at least my
laptop, an external display, the router, the desk lamp and possibly my
speakers create S5-7 noise on all bands and S9 noise on some of them.

I unplugged the power cable that controls the desk and the noise dropped to
an S1-2.  I plugged the main power cord back in and then started by
unplugging individual items, keeping track of what I was plugging in and
what the noise level was like.

I placed an order on Amazon for some snap on ferrite beads and they should
be here  today. Having never had to track down the source of noise like
this, I am unsure of where to place the beads to have the maximum effect to
clear up the signals so I can enjoy operating from home...

I'll add that I first noticed the high amounts of noise after I had strung
up a wire inside the office because something had happened to my G5RV on
the roof.  I am suspecting bad coax on the G5RV as I have it working by
playing with the coax.  Neither of the PL-259s on my Comet CTC-50 window
passthrough jumper (Landlord and XYL say no holes in the house.. :() are
tightened down and I can hear stations in the noise.  Tighten them down and
I get silence. If I unplug the antenna from the side of the KX3, I get
silence (well, unless the volume is up in the 30's or higher and I have the
speakers connected) I can still hear noise but it doesn't register on the S
meter.

If anyone could help out a still somewhat new General with this, it would
be appreciated.

72,
Joshua Gould
K8WXA
EM89pn

KX3# 7480
NAQCC # 7704