Re: RFI from mains ethernet adaptors

Allan Isaacs

Hi Kriss

This scan is from our Hotpoint washing machine in standby which plays musical notes on a portable radio. Not the usual mush.

The scan in green is the washing machine, 4MHz plus minus 1MHz.

Yellow 30 feet away.

Because the mains plug is behind the thing it will need an extension lead so I can turn it off from standby.

Allan G3PIY

From: [] On Behalf Of Kriss Kliegle KA1GJU
Sent: 26 September 2021 12:50
Subject: Re: [SDR-Radio] RFI from mains ethernet adaptors


I cured mine with an FT-240-31 Ferrite Toroid and an improved AC line filter, all of which I installed inside the washer. My first SDR antenna (EFW) was overhead the washer by about 25'.
Mine had a similar, useless, small plastic AC line filter as the OP in the following page:

I don't remember the make and model of the filter, but was in a metal case just like the OP's. Between the toroid and the filter, it was gone! There's a little RFI coming from the control panel, but only within a foot of it.

73 Kriss KA1GJU


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