[RFI] Noise changes when room lights turn on / off- NOISE FOUND!!!!!

[Tony]

On 9/22/2012 7:23 PM, Roger D Johnson wrote:
> Are the porch lights photocell controlled? My neighbor had a 
> controlled lamp at the
> end of his driveway. He replaced the incandescent bulb with a CFL. 
> Horrible noise!
> I found that some of the older controllers will not work properly with 
> CFLs.
>
> 73, Roger

They could be Roger. I'll find out more when I see my neighbor.

Tony


>
> On 9/22/2012 4:34 AM, Tony wrote:
>> All:
>>
>> I ventured out at 4AM this morning and found the noise! It turned out 
>> to be my neighbors CFL porch light. There are two lights on the porch 
>> and the one that's not working is the one making the noise. The 
>> working CFL isn't exactly quiet, but it's nowhere near as loud as the 
>> non-working light.
>>
>> I used a battery powered HF rig with a make-shift coax antenna; just 
>> the center conductor with the shield stripped away. I made sure I 
>> checked the noise at the house before I left and used the same 
>> frequency on the portable. That made the noise easy to identify once 
>> heard.
>>
>> I also shut the mains on the house and kept them off just to make 
>> sure it wasn't coming from my home. The noise was still there with 
>> the mains off. The puzzling thing is the light switch issue....
>>
>> The noise being generated by my neighbors CFL shifts in frequency (by 
>> several kHz) when I turn off the light switch in MY shack! It will be 
>> interesting to see what happens when he replaces his bad CFL.
>>
>> So are there any quiet CFL's on the market? Lowes have them?
>>
>> Thank for all.
>>
>> Tony -K2MO
>>
>>
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>