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Author Topic: Dishwasher motor noise on all frequencies.  (Read 5737 times)
K0UA
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Posts: 1456




Ignore
« Reply #15 on: October 17, 2017, 01:16:18 PM »

A bedtime run is not a bad idea, if it's a relatively silent machine Smiley.

I have some minor motor noise from my washing machine. I tried some snap-on ferrites but no relief. Of course, it doesn't help that I cannot determine where the noise is actually coming from (radiated vs. conducted,...common mode vs. differential mode...). If your dishwasher is anything like my washing machine (just me and the wife, YMMV if kids are involved Smiley), it doesn't run very often, perhaps once a week and then only for a couple of hours. So I try to plan my on air time around it. However, if you use it often, then I certainly can understand your desire to solve rather than ignore it. That would be like my furnace draft inducer motor noise, which is really annoying in Winter because it runs so often. I've not been able to solve it with an RFI kit from Trane, nor with snap-on ferrites, so I have to put up with it unless I get a better idea. Nevertheless, it's certainly worth asking the manufacturer and doing a little experimenting to see if the fix is simple. Unfortunately, in my experience, the noise problems are consistently one step ahead of me.

I wonder if it is time for some .1uF bypass capacitors. ?  I fought the 80 meter RF from my antenna getting into our alarm system for some time.  RF snap on's helped to some extent, but it took some .1 caps to fix it.  I tried .01 first ad they did not help but 3 of the .1's and the problem was solved.
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