I have 2 LED bulbs (60W incandescent replacement) and have been unable
to hear them, which is good. Today I bought 3 more types (at the local
Ace, because I can return them if they make noise). So I'm about to
test them.
I am curious what people's experiences are in terms of which frequencies
are likely to be the problems. I would sort of expect 40 meters, just
because that seems to be the epicenter of RFI generally. But I realize
it's highly dependent on the switch-mode supplies in the bulbs. I also
saw a report of interference from LED bulbs meant to replace 60W metal
halide bulbs.
To do a quick test, my procedure is to put one of the new bulbs in a
basic desk lamp in the shack, turn off other known noise sources, use an
attic multiband dipole (one end of which is only 15' away), and step
through the bands 160m-6m and see if I can tell a difference turning the
light on and off. I will also check 145 MHz.
Does that make sense, or is there anything else that's easy that I can
do quickly? (I don't have a spectrum analyzer with a LISN....)
I'll post my notes on specific brands and findings.
73 de n1dam
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