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Author Topic: Noise Problems  (Read 7994 times)
N9GUN
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Posts: 2


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« on: June 18, 2000, 04:09:55 PM »

My neighbor has a ceiling fan that generates random noise sweeps across most of the HF bands as well as 2 meters.  This fan noise is pulse oriented and turns on and off with no apparent pattern.  I've tried DSP noise filters like the JPS ANC and others.  The Noise Blanker in my TS-870 takes it out but then strong adjacent signals blow me away.  Any ideas?  The neighbor is about 500 yards away from me and the antennas.

Please help!
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FORMER_W5JI_JC
Member

Posts: 146




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« Reply #1 on: June 19, 2000, 05:26:07 PM »

A couple of questions:
1 - is there a variable speed control on the fan?
2 - if not, is it a pull-chain multispeed fan?
3 - are you on the same pole pig? Being 500 yards away,
probably not, but......

If there is a variable speed control, it is most likely the
culprit. They operate such that they vary the AC to the
fan. Generally this is done with a SCR-type semiconductor
and the switching edges can generate a lot of HF/VHF noise.
If the owner installed the fan and speed control, I'd bet
that the AC ground is not hooked up, especially if it is an
older house with 2-wire distribution.

If you are on friendly terms with the owner, check the
wiring. If not, you should be able to get the local
electric utility to check it out.

I doubt if anything other than grounding and/or shielding
the speed control will help the noise. If it is the speed
control and you can't ground or shield it, see if there
is a possibility of putting the fan on a variac-type
AC speed control which does not generate switching
transients.

Good luck.......Jim
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N9GUN
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« Reply #2 on: June 19, 2000, 09:49:20 PM »

Thanks Jim -

I've not looked at the fan or the wiring yet.  I'm sure I'm not on the same transformer.  I hunted down the noise with a portable receiver and have surmised a fan due to times and temps when the noise gets turned on and off.  The wiring in the neighborhood is all 110V with conduit for the ground.  It's possible that the ground wire was not connected though....I'll approach the neighbor this weekend and see if I can take a look.  Otherwise maybe do some electrical box shielding to see if it would help.  Unfortunately, Commonwealth Edison just ignored my complaints and seems to be of no help.  Thanks for your input.....

73 de Tom, N9GUN
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