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Author Topic: Ceiling Fan Causing Noise  (Read 1950 times)
AJ8MH
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« on: August 22, 2017, 05:47:38 PM »

Been hearing noise out at the cabin for the past few weeks from 30 through 2 meters.  Started to search this past weekend and found the ceiling fan in the master bedroom to be the cause.  If I reverse the rotation, the noise goes away.  Haven't taken the fan apart, but it's on my list of things to do.  The exact same ceiling fan in the guest bedroom is quiet in both directions.  Figure that one out!
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K0UA
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« Reply #1 on: August 22, 2017, 07:54:23 PM »

Been hearing noise out at the cabin for the past few weeks from 30 through 2 meters.  Started to search this past weekend and found the ceiling fan in the master bedroom to be the cause.  If I reverse the rotation, the noise goes away.  Haven't taken the fan apart, but it's on my list of things to do.  The exact same ceiling fan in the guest bedroom is quiet in both directions.  Figure that one out!

Is it fed with some sort of dimmer/speed control?
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AJ8MH
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« Reply #2 on: August 23, 2017, 05:21:56 AM »

No dimmer.  Speed is controlled by the standard 3-speed pull switch on the fan.  I'm assuming the same speed control parts are use while the fan is rotating CCW or CW.
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KC4ZGP
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« Reply #3 on: August 23, 2017, 05:39:05 AM »


Replace the fan.

On 18.087MHz Morse after 2200UTC.

Kraus
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ND6M
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« Reply #4 on: August 23, 2017, 07:49:52 AM »

Move fan from guest BR to master br. Grin
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K0UA
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« Reply #5 on: August 23, 2017, 08:50:02 AM »

Well, it is an enigma to me as to why it would generate RF.  Maybe some .01 caps at 600 volt rating across the AC would help?
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KH6AQ
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« Reply #6 on: August 23, 2017, 05:53:50 PM »

Is the noise broadband (covering the entire band) or is it narrow (a few kHz)? If narrow, changing the fan direction, speed, or using a different fan will result in the noise being on a different frequency than the fan your receiver has been tuned to.
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KD0REQ
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« Reply #7 on: August 24, 2017, 10:18:44 AM »

stock fans without a remote control add-on are plain old induction motors, ac here, ac there... or ac over a slanted core so it turns a core-only rotor. latter is your cheap home-center motor in the fan.  if there is no speed control on the thing, something is starting to go way wrong, and it's time for another $20 closeout special fan.
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KE2KB
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« Reply #8 on: August 24, 2017, 02:00:54 PM »

I will assume that these fans don't use brushes.
If it does, then I would suspect them.
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AJ8MH
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« Reply #9 on: August 24, 2017, 06:21:48 PM »

Is the noise broadband (covering the entire band) or is it narrow (a few kHz)?

Noise is broadband and loud.  Maybe the CW/CCW switch is arcing.  I'll check that first, but it's probably time to buy a new one before the cabin burns down.
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