[600MRG] Fw: RFI identified

Ben Gelb ben at gelbnet.com
Mon Jan 6 01:29:32 EST 2025


Had similar fridge problem here. And Corcom filter also took care of it.

Funny thing - I renovated my house some time after figuring this out,
and completely replaced all the electrical in the house. Afterwards I
found the fridge no longer needed the corcom filter. Pre-reno house
had very old wiring, and grounds (where there were any) were added
after the fact and often followed completely separate path than the
line conductors. I've always wondered if that made things a lot worse
(imagining big current return loops with lots of cross-sectional area,
vs nice tight romex bundle).

Also did not have option to remove all dimmer switches, but have found
reverse phase dimmer (specifically Lutron Maestro PRO) works very well
w/ LED lighting and doesn't create any noticable RFI on the low bands.
I have compared (for science) with a Lutron Maestro LED+ dimmer (which
doesn't have reverse phase) and confirmed the reverse phase capability
really does make a difference! Lots of RFI on 630/2200 out of the
lower cost model.

73
Ben N1VF

On Sun, Jan 5, 2025 at 11:57 AM WM3M <wm3m73 at gmail.com> wrote:
>
> I had similar problem with my fridge, took me awhile to figure it out.  Put 2 large ferrites on the AC power line between fridge and AC outlet, RFI was just about gone.  Wrapped them a couple turns each.
>
> Also have even worse RFI problem with dishwasher, when its running HF rigs are nearly useless, tried everything I could think of, no affect on RFI noise, so only run dishwasher when not on the air.
>
> Gook luck... 73
>
> Emory  WM3M
>
>
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