[RFI] CFL Noise Update - Neighbor Removes Burned Out CFL
dxdx at optonline.net
Wed Oct 10 00:13:33 EDT 2012
On 10/9/2012 12:35 PM, Al K0VM wrote:
> This may be a bit of a stretch... It could be possible that
> turning on the switch in our house effectively changed the pattern of
> your receive antenna in the direction of the bad CFL. Did just the
> level of the interference change when you flipped the switch or did
> the interference shift frequency. Any way, just glad you found the
> source of the problem.
The noise would only shift in frequency -- the noise level would stay
You make a good point though!
> AL, K0VM
> On 10/9/2012 1:01 AM, Tony wrote:
>> I recently discovered that my neighbors CFL lighting was causing RFI.
>> I managed to get close the light with a portable HF rig and found the
>> noise was identical to what I was hearing in the shack; same
>> frequencies, same noise characteristics. I should mention that the
>> bulb was burned out.
>> The problem with pointing the finger at the light as the only RFI
>> source was that the noise would shift in frequency when I turned a
>> light switch on and off in my home! I recorded the frequency shift
>> "trick" on video: http://www.youtube.com/watch?v=EYHbpLfQ1gc
>> I shut the mains to see if the noise was coming from my home, but it
>> was still there with the breakers off. The light switch had no effect
>> on the noise as long as the mains remained off.
>> Long story short:
>> The noise went away immediately the moment my neighbor removed the
>> burned out CFL. An identical CFL that was working emitted much less
>> noise. He hasn't replaced the bulb yet so we'll have to see what
>> happens with the new one.
>> The puzzling thing about all this is how a light switch in my home
>> could have an effect on the noise coming from a neighbors CFL? It
>> doesn't appear coincidental because the light switch "trick" hasn't
>> happened since my neighbor removed the CFL. It's been a while now and
>> all is quiet.
>> Any ideas?
>> Tony -K2MO
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>> RFI at contesting.com
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