Topband: New Noise - 160 Meters

[Petr Ourednik]

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:
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> > ----- Original Message -----
> >
> > From: "Joe Galicic" <galicic at comcast.net>
> > To: "PVRC List" <pvrc at mailman.qth.net>, "TopBand List" <topband at 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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