[RFI] Noise changes when room lights turn on / off UPDATE

[Roger (K8RI)]

On 9/13/2012 11:08 PM, Tony wrote:
> All:
>
> Just an update on the noise:
>
> Turned off all breakers in the house except for one that powers a single
> A/C outlet in the shack. The noise was still there. Friend has not come
> through with his battery powered HF rig so I might just by a small 12
> volt so I can run the rig with the main breaker turned off.
>
> To recap:
>
> - noise appears each night between 7PM and 8 PM.
> - Continues intermittently until morning and is not heard during the day

The timing Sounds like an Electric Blanket or Water Bed heater.
OTOH could be one of those battery chargers for a plug in hybrid.
The characteristics are those of a charger.  Computer? Car? tablet?

73

Roger (K8RI)


> - it sounds similar to line noise. It's wide-band about 30khz in width
> - It appears every 120 kHz on several HF bands.
> - noise shifts in frequency when shack light is turned on / off using
> house switch
> - shack light is not the source of the noise. It's there with the light
> unplugged
> - noise appears on a heading that is beaming away from my QTH
>
> Noise video - http://www.youtube.com/watch?v=EYHbpLfQ1gc
>
> Thanks,
>
> Tony -K2MO
>
>
>
>
> -
>
>> > All:
>> >
>> > The noise that appeared this evening at 7:00pm may have something to
>> do with AC power coming into the house. I noticed that the noise
>> changed when I turned the shack light on and off. This video shows
>> what happens: http://www.youtube.com/watch?v=EYHbpLfQ1gc
>> >
>> > There are no florescent lights or touch lamps in the house.
>> Unplugging the shack light does not make the noise go away. Turning
>> the shack's light switch on or off with the light unplugged does not
>> change the noise. The noise persists with power supplies, computers
>> and TV's turned off or unplugged.
>> >
>> > I'll investigate further and report back tomorrow.
>> >
>> > Thanks,
>> >
>> > Tony -K2MO
>
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