The fact that clamp-ons reduced but didn't cure is a good sign. A few
turns thru ferrite toroids are ever so much more effective than the
clamp-ons which I think is what you mean by "beads." Mix 31 is best for
HF, but 43 will also work well. USB cables with an A-connector on one
end and a B on the other will support 3 or 4 turns on a 1 1/2" toroid if
you wind it using the B-end. The finally wound toroid should be placed
at the end of the cable connected to the device experiencing the RFI.
Larger clamp-ons will often let you get two passes thru the ferrite for
thicker power cords. Common mode chokes are usually placed at the feed
point of the antenna, but there are times when one on the coax at the
rig will reduce RFI also. And, don't forget any audio, keyboard, or
mouse cables. Visit k9yc.com for more exact, specific research on every
choke known to humankind. 😉
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
David F. Reed wrote on 12/19/2021 4:24 PM:
Due to some HOA C&R, I am confined to attic and gutter antennas for
the time being.
I am getting a bit of RFI on occasion into my PC; it manifests itself
mainly by apparently disconnecting the com port from Commander. When
this happens, I can restore functionality by selecting a different com
port, and then re-selecting the original correct com port.
I am grounded to a 10' ground rod about 8 ft. from the station via 2"
copper strap. I did install ferrite beads on the USB cables at the
back of the PC as well as on the power cord, and this has reduced the
frequency of occurrence, but I would like to eliminate it altogether.
Any other ideas and suggestions would be most appreciated!
Thanks & 73 de Dave, W5SV
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