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RFI caused by faulty streetlight (part 1)

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Uploaded on Feb 21, 2010

This video was taken on 18 Feb. 2010 in the Driesstraat te Merelbeke - Belgium. It shows a FT-817ND radio on 3.5 MHz in AM mode, on which you can hear the rattle of the interference made by a faulty streetlight. During ignition the interference is on, when the street lamp gets actitvated (bright), the interference stops.
Ray, NR1R, gave me the following technical explanation on what is happening: the noise occurs when the sodium vapor start mecanism in the bulb starts arcing; when the sodium vapor electrode gets hot enough, the bulb lights and the noise goes away till the bulb goes dead again and the process begins again. It is called a cycling bulb. The bulb needs replacement when this occurs. Tnx Ray!

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