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tech / sci.electronics.repair / Re: Fan causing MW RFI

Re: Fan causing MW RFI

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Subject: Re: Fan causing MW RFI
From: johnsonsatake@gmail.com (Brad Johnson)
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by: Brad Johnson - Mon, 9 Oct 2023 23:32 UTC

Jeff Layman wrote:
> > I have a 6-months old Fantasia ceiling fan (mains powered, with 6-speed
> > reversible dc motor) which is causing a lot of interference on MW.
> FM

you can try and put a AC line filter as close to the device as you can , 3 wire AC feeding is better ....
DC motor may need bypass caps , which might be a problem for the 6-speed driver....
The clamp on fairrite or a core should be on everything in a ham home, and all overhead AC drop lines IMO.
the type 75 cores are only about $1 and go after all the noise below 1mhz ( that's is where most of it comes from )
you may be able to use the AC line filters on DC if amp rating is enough ( leave a little margin here... )
tips from a solar-powered ham radio operator.
pics on my QRZ site Ko6kL

Re: Fan causing MW RFI

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Subject: Re: Fan causing MW RFI
Date: Tue, 10 Oct 2023 10:40:47 +0100
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by: Jeff Layman - Tue, 10 Oct 2023 09:40 UTC

On 10/10/2023 00:32, Brad Johnson wrote:
> Jeff Layman wrote:
>>> I have a 6-months old Fantasia ceiling fan (mains powered, with 6-speed
>>> reversible dc motor) which is causing a lot of interference on MW.
>> FM
>
> you can try and put a AC line filter as close to the device as you can , 3 wire AC feeding is better ....
> DC motor may need bypass caps , which might be a problem for the 6-speed driver....
> The clamp on fairrite or a core should be on everything in a ham home, and all overhead AC drop lines IMO.
> the type 75 cores are only about $1 and go after all the noise below 1mhz ( that's is where most of it comes from )
> you may be able to use the AC line filters on DC if amp rating is enough ( leave a little margin here... )
> tips from a solar-powered ham radio operator.
> pics on my QRZ site Ko6kL

LOL!

I posted the original query almost 9 years ago! It was fixed a few days
later by using a delta suppression capacitor and ferrite ring large
enough to take all the mains leads.

Jeff

Subject	Author
Fan causing MW RFI	Brad Johnson
Fan causing MW RFI	Jeff Layman