[Elecraft] RFI/EMI and dealing with it

[Jim Brown]

Hi Joshua,

Several years ago, I wrote a tutorial on RFI and how to deal with it. 
k9yc.com/RFI-Ham.pdf

73, Jim K9YC

On Wed,2/25/2015 7:00 AM, Joshua Gould wrote:
> 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
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