I don't usually chime in on these threads, but not all LED's are
culprits. I had originally replaced all the incandescent bulbs in my
house with the compact fluorescent (CFL) type. My noise floor went up a
couple of dB when any of them were on, so after a couple of those so
called "5000 hour" Chinese CFL's actually burned up (yes, smoke, fire
and flames) I bit the bullet and replaced all the fluorescent lights in
the house with LED's, including some ceiling fixtures that used 2 and 4
foot tubes. Even though I don't have any "light dimmers" in the house,
I bought the "dimmable" LED 60 and 75 watt equivalents and now my noise
when they on is exactly the same as when they are all off. Getting rid
of the CFL's and doing to the LED's dropped my noise floor to whatever
the atmospheric (plus whatever the neighbors generate) noise floor is.
Sure glad those CFL's tried to burn down my house as it caused me to get
rid of them. I was able to hear and work the South Georgia VP8SGI
station on 15 meters and he was only maybe S1 here. Bad propagation to
that part of the world from Kansas even with 500 watts and a beam so I
missed the South Sandwich part. Never heard them except on 30 meters
and my antenna favors East/West and I swear some of the people that
worked them on 30 were so strong here that HAD to be using more than the
legal power limit on 30.
Jim - W0EB
On Mon, 2016-02-01 at 22:48 -0500, johnpierce wrote:
My kitchen, under cabinet lights, are LEDs. With those lights turned
on my
noise floor changes from -128db to -102db. If the circuit is changed
to a
different phase the noise improves by 6db. All of this at 7mhz and
other
higher bands. Needless to say the AM broadcast band is highly
affected by
the LEDs.
Placing a type 31 core with three turn of the AC line feeding the LED
power
supply and a clamp on 31 core on the LED side of the power supply
provides
no improvement! I do not have an oscilloscope to look at the
waveforms.
But given what I have done, why is there no improvement? I was
following
recommendations provided by NK7Z.
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