[Elecraft] RFI

[Dave]

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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