Hi,
Purchase some FT240-31 ferrite cores,
(https://www.farnell.com/datasheets/1912768.pdf), and wind at least 5
turns of each cable going to, or from, the computer through the ferrite.
I have several of these, and they stopped ALL of my RFI issues with my
computer, and with a weather station I have as well.
Shop around looking for the best price, some folks are asking 10 bucks
for one of these, others are asking 5 bucks... I use Newark, and
Digikey as my goto places.
Also look to K9YC's site, for more information on how to make the chokes...
http://k9yc.com/2018Cookbook.pdf
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 12/19/21 16:24, David F. Reed wrote:
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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