[RFI] Noise changes when room lights turn on / off
Tony
dxdx at optonline.net
Thu Sep 13 22:14:17 EDT 2012
On 9/13/2012 9:56 PM, Tim Duffy K3LR wrote:
> Hello Tony:Could your noise problem be related to a dusk to dawn light at your home or
> a street light? Or a neighbors outdoor light (only on when it is dark)? 73,Tim K3LR
Hi Tim:
That's what I thought until I saw the noise shift when I turned the
light off in the shack. You can see what happens in the video:
http://www.youtube.com/watch?v=EYHbpLfQ1gc
The light is not the source of the noise because the noise continues
with the light unplugged. There are no florescent lights or touch lamps
in the house. I disconnected the only sensor lamp I have on the house
today and the noise was still there.
I guess the question is: why would the noise shift in frequency when I
turn a light switch on / off in my home if the noise is coming from an
outside source like a street lamp or a neighbors porch light?
Puzzling Tim...
Thanks
Tony -K2MO
>
> -----Original Message-----
> From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of Tony
> Sent: Thursday, September 13, 2012 7:20 PM
> To: Rfi List
> Subject: Re: [RFI] Noise changes when room lights turn on / off
>
> On 9/12/2012 1:33 AM, Jim Brown wrote:
>> This has the potential stink of one or more wiring errors INSIDE your
>> home.
> Jim...
>
> I setup the computer to monitor the noise 24 hours a day. It's been a
> few days now and it's only come on at night between 7:00PM and 7:30PM.
> There is no noise present during the day.
>
> Assuming it is a house wiring problem and not an appliance, what would
> cause it to come on in the evening and stay on till morning? Would
> temperature and humidity cause this?
>
>> Finally, make sure that there's REALLY a ground on the panel where
>> power comes to the building, and that it goes to something going to
>> the earth. That's another thing that was wrong here. :)
> Good advice Jim. The house was built in 1984 and there is a ground rod
> attached to the panel. I'll check the connection tomorrow morning.
>
> Thanks
>
> Tony -K2MO
>
>
>
>
>
> If that is the case, what condition would make it so the noise only
> appears at night?
>> Look for all the simple dumb mistakes -- outlets wired with phase
>> (hot) and neutral reversed, or with ground (green) and neutral
>> reversed, light switches wired wrong, extra bond(s) between neutral
>> and ground (there must be one, and only one, and it must be in the
>> main panel). It's common for there to be extra bonds in laundry
>> appliances. Look also for an appliance (or outlet, or even that
>> light) getting power between phase (hot) and Green, rather than
>> between phase and neutral.
>>
>> It's a rare building that doesn't have at least one of these problems.
>> The home I bought here in CA had all three.
>>
>> Finally, make sure that there's REALLY a ground on the panel where
>> power comes to the building, and that it goes to something going to
>> the earth. That's another thing that was wrong here. :)
>>
>> 73, Jim K9YC
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