Today I noticed QRM on 136kHz that started when my wife switched a
light on in our spare room. It had a low energy bulb by Status, and
was marked "11W, 220-240V, 50/60Hz, 100mA". It is described on their
web site as "stick type" and is bayonet fitting. The QRM consisted of
rapidly changing noise sweeping back and forth across the band (see
attached pic).
I replaced it with a Philips Genie WW287 light which did not seem to
generate any noise.
The other low energy lights in the house are General Electric E27-ES
11W bulb types which are very slow to get to full brightness, but are
low QRM at LF. The rest are ancient filament types which are
completely QRM-free of course.
So if you have this noise, perhaps it's one of your light bulbs.
Mike, G3XDV
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