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Author Topic: RFI to clothes dryer  (Read 150 times)

K7JQ

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RFI to clothes dryer
« on: December 12, 2022, 02:25:54 PM »

A friend of mine is having RFI issues *to* his electric clothes dryer. It's a late model Whirlpool with matching front load washer. Anything over 100W and the machine's digital control panel lights up and beeps. Antennas in an HOA are dipoles close to his roof, about 20 feet from the dryer. Are there ferrite toroids that will fit over the very thick dryer cord, or any other recommendations? Thanks!

Bob K7JQ
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KD0REQ

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Re: RFI to clothes dryer
« Reply #1 on: December 12, 2022, 02:46:47 PM »

(1) unplug the dryer. open the control panel (usually one screw, tilt it) and make sure the ground connector from the control head to the dryer body was not omitted. add one if it was.  (2) there are half-inch slip-over ferrites out there, nebraska surplus is one source. (3) worst case, dry clothes when the band is dead.
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W9IQ

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Re: RFI to clothes dryer
« Reply #2 on: December 12, 2022, 03:27:27 PM »

Bob,

On what band(s)?

- Glenn W9IQ
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- Glenn W9IQ

God runs electromagnetics on Monday, Wednesday and Friday by the wave theory and the devil runs it on Tuesday, Thursday and Saturday by the Quantum theory.

K6BRN

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Re: RFI to clothes dryer
« Reply #3 on: December 12, 2022, 04:41:36 PM »

A friend of mine is having RFI issues *to* his electric clothes dryer. It's a late model Whirlpool with matching front load washer. Anything over 100W and the machine's digital control panel lights up and beeps. Antennas in an HOA are dipoles close to his roof, about 20 feet from the dryer. Are there ferrite toroids that will fit over the very thick dryer cord, or any other recommendations? Thanks!

Bob K7JQ

Hi Bob (K7JQ):

Oddly enough I have the same machines (washer + dryer) and have found that they are very susceptible to conducted EMI on the POWER line.  It's worst on 40M.  Adding an ISOBAR filtered power strip solved the problem, one for the washer, one for the dryer.  But this won't work too well on a 240VAC electric dryer (mine is gas heated).

It does suggest that wrapping the power cord through some LARGE mix31 ferrites - or building a 240VAC jumper that has many wraps through one or more large Mix 31 ferrite toroid's may help.

Brian - K6BRN
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K7JQ

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Re: RFI to clothes dryer
« Reply #4 on: December 12, 2022, 06:35:13 PM »

Bob,

On what band(s)?

- Glenn W9IQ

I believe 10 and 15M. I just spoke to him about 20 minutes ago…another friend of his had a large ferrite that he was able to wrap the power cord through twice, and voila, it did the trick! Usually it’s not that simple, but he lucked out. Thanks for the replies, guys!
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