On 11/28/2018 3:29 PM, Mike Smith VE9AA wrote:
I have tried enough ferrites to sink the Queen Mary. I have rerouted cables,
replaced USB cables many times. I have wound USB cables into giant (chokes)
loops. I have grounded rigs; ungrounded rigs (some success at times!) and
even pounded 2 big ground rods into the Earth just outside the shack and fed
them with huge wire right through the wall. I have even wrapped all kinds
of things in aluminum foil and made aluminum foil shields (for the bottom of
my laptop, which sits on a shelf above the rig that seems affected the
worst). I have moved stuff around the shack. I have even changed the
connection speeds (50% slower/normal.whatever) in N1MM setups. (with varied
success)
All of this suggests that you don't understand the fundamentals of
Bonding. Your problem is almost certainly a failure to do that in your
station. There are two good places to learn this. First, N0AX's ARRL
book on Grounding and Bonding, on which I collaborated extensively. It's
not free.
http://www.arrl.org/shop/Grounding-and-Bonding-for-the-Radio-Amateur/
Second, the same information on my website. It IS free.
http://k9yc.com/GroundingAndAudio.pdf
Also on my website, these instructions for finding and killing noise.
Follow its guidelines for winding chokes to kill RFI either sent or
received.
http://k9yc.com/KillingReceiveNoise.pdf
73, Jim K9YC
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