[BVARC] RFI
Gus Bernard
gnelnard at gmail.com
Mon Dec 20 09:22:59 CST 2021
I don't understand what is "RFI on occasion into my PC . . . by apparently
disconnecting the com port from Commander," but:
1. By transmitting into attic and gutter antennas, you're lighting up the
whole house and shack with RF;
2. As already stated, add snap on ferrite cores of the correct mix to DC
power cords and both ends of USB cables. The cores must be large enough to
hold at least 3 wraps (loops) of cable, and maybe more (depending on the
amount of RFI);
3. Ground all pieces of equipment (including antenna switches AND your
computer) to your shack's station ground in a "home run" fashion; and
4. If #s 1-3 don't solve, reduce TX power until problem goes away.
I second Robert's choke suggestion, and it may need to be a quality
isolation transformer, but you don't give enough information about your
feed line configuration for a proper recommendation.
Finally, there are USB isolation transformers available; and, you might (by
trial and error) find a computer with COM port input circuitry that is less
sensitive to RF.
Gus, K5GMB
On Sun, Dec 19, 2021, 6:24 PM David F. Reed via BVARC <bvarc at bvarc.org>
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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