Re: Topband: New Noise - 160 Meters

[David Cutter]

Petr

That's very interesting.

I have heard that long led strips eg in the kitchen are powered from a noisy 
smpsu: the long cable is the antenna.  A linear supply should stop that 
noise or small ferrite toroids (it's very low current).  I have just 
purchased some from IKEA and will be testing them soon.


David
G3UNA




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 


_
Topband Reflector Archives - http://www.contesting.com/_topband

Re: 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:
> > Boxbe  This message is eligible for 
> > Automatic Cleanup! (gali...@comcast.net) Add cleanup rule 
> > 
> >  
> > | More info 
> > 
> >  
> >
> >
> >
> > Link to files 
> > https://www.dropbox.com/sh/3ftcsm50mvr9jmy/AABcDfHjYn-GKvelQhmyJTBia?dl=0
> >
> > - Original Message -
> >
> > From: "Joe Galicic" 
> > To: "PVRC List" , "TopBand List" 
> > 
> > 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
> > _
> > Topband Reflector Archives - http://www.contesting.com/_topband
> >
> > _
> > Topband Reflector Archives - http://www.contesting.com/_topband
> 
> _
> Topband Reflector Archives - http://www.contesting.com/_topband
_
Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: New Noise - 160 Meters

[Herbert Schoenbohm]

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  This message is eligible for 
Automatic Cleanup! (gali...@comcast.net) Add cleanup rule 
 
| More info 
 




Link to files 
https://www.dropbox.com/sh/3ftcsm50mvr9jmy/AABcDfHjYn-GKvelQhmyJTBia?dl=0

- Original Message -

From: "Joe Galicic" 
To: "PVRC List" , "TopBand List" 
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
_
Topband Reflector Archives - http://www.contesting.com/_topband

_
Topband Reflector Archives - http://www.contesting.com/_topband


_
Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: New Noise - 160 Meters

[Joe Galicic]

Link to files 
https://www.dropbox.com/sh/3ftcsm50mvr9jmy/AABcDfHjYn-GKvelQhmyJTBia?dl=0 

- Original Message -

From: "Joe Galicic"  
To: "PVRC List" , "TopBand List"  
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 
_ 
Topband Reflector Archives - http://www.contesting.com/_topband 

_
Topband Reflector Archives - http://www.contesting.com/_topband