Yep, I've had a number of street lights with the exact same noise.
For whatever reason, ballast, light sensor, etc, the light starts to
cycle on and off. When the light is off you won't hear any noise.
When the light starts coming on dim and slowly gets brighter that is
when you hear the noise gradually building in strength for a few
seconds. The light gets to full brightness and stays lit for a
little while then turns off again starting the whole process all over
again. I've found these malfunctioning street lights up to several
blocks away causing S9 noise on 75 meters. You'll have to drive
around at night to find them. If you can't find anything on your
street you'll have to go out further, up to a few blocks away. A
light malfunctioning on your street, maybe a half a block away will
be 20 to 40 over S-9. 3 or 4 blocks away S-7 - S-9, weaker the
farther away of course.
Call either the city street maintenance office or your local power
company. It varies as to who has responsibility for the street
lights. In my city it is Xcel Energy, the local power company.
On 13, Oct 2007, at 6:21, Barry N1EU wrote:
> For over a year, I've been plagued by cyclical noise bursts on 160/80M
> of about 30sec duration repeating every 2 minutes or so. Here are
> some examples (stereo recordings):
> http://n1eu.com/29Jan07a.wav - AM L channel, CW R channel
> http://n1eu.com/09Oct07a.wav - CW
> I've been pondering how to go about locating the source. Does it seem
> reasonable that the source is likely to be between a quarter and half
> mile distant? Does the noise correlate with the lamps visibly
> restarting/flickering? I was thinking of putting a telephone next to
> the rig's speaker and monitoring the audio with a cell phone while
> driving around and observing the street lights.
> Any comments/suggestions appreciated.
> Barry N1EU
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