Hello,
not only the "defective" LED lamps makes the noise.
I found several LED strips (used commonly in kitchen)
and LED bulbs coming from China generates strange noise
on HF bands. I noticed it when the noise raised up from S3 to S7
on 160m while I was on key. So I immediately went to investigate
what was changed at our home and I discovered that XYL switched
ON the LED strip installed in kitchen cabinets.
The same noise source was the LED bulb in the small bed lamp in the
bedroom. After I replaced all of these Chinese crappies with standard
lamps
the noise gone. (LED strip in kitchen cabinets must be OFF when I am on
key, hi)
Hope it helps,
73 - Petr, OK1RP
On Fri, Oct 14, 2016, at 11:47 AM, Herbert Schoenbohm wrote:
> I found a defective LED lamp that sounded. Getting the neighbors to
> turn off lamps one by one while you listen in the shack over the phone
> might help if they will do that. In my case it had peaks staring in
> the AM band and noticeable up to 4 Mhz. Also a bad cell phone charge
> adapter power source could be the cause.
>
>
>
> On 10/13/2016 1:41 PM, Joe Galicic wrote:
> > Boxbe <https://www.boxbe.com/overview> This message is eligible for
> > Automatic Cleanup! (galicic@comcast.net) Add cleanup rule
> > <https://www.boxbe.com/popup?url=https%3A%2F%2Fwww.boxbe.com%2Fcleanup%3Fkey%3D7%252F59dJ6v0jwwslOtBEMkHIItzEsOM6Jf3CC2IdMU8ng%253D%26token%3D1nmKRas9kmwuCwwYRwQOTya04iOoJ5MP%252FuMnYsY2AhRZK33r9nraMnZZVy5MLMzGaQLf%252FG%252FypkMyN%252FA%252B2raVgjgV%252F4BbVroKjod1L6lJN4sDRDGQwTd4MSHtuDu9ZHey%252FubRebXaoJc%253D&tc_serial=27154496124&tc_rand=1244581705&utm_source=stf&utm_medium=email&utm_campaign=ANNO_CLEANUP_ADD&utm_content=001>
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> >
> > Link to files
> > https://www.dropbox.com/sh/3ftcsm50mvr9jmy/AABcDfHjYn-GKvelQhmyJTBia?dl=0
> >
> > ----- Original Message -----
> >
> > From: "Joe Galicic" <galicic@comcast.net>
> > To: "PVRC List" <pvrc@mailman.qth.net>, "TopBand List"
> > <topband@contesting.com>
> > Sent: Thursday, October 13, 2016 1:35:15 PM
> > Subject: Topband: New Noise - 160 Meters
> >
> > Just put up my 160 antenna and have a new noise source to find. Very loud
> > wide band buzzing that starts in the middle of the AM broadcast band and
> > then abruptly drops to zero at 1870 KHZ. I have attached sound file and
> > panadapter screen shots. It is not coming from my QTH. One night it went
> > off at 11PM sharp but has returned and doesn't seem to quit. I will
> > continue to monitor for a cycle. I walked the neighborhood with portable AM
> > radio and the noise seems to be contained within a four house area. Tough
> > to tell which house though. All utilities are buried in my neighborhood.
> > Could this be a grow lamp ? Thanks -Joe N3HEE
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> > Topband Reflector Archives - http://www.contesting.com/_topband
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