LED And Fluorescent Noise Characteristics ? And, 2-3 MHz (noise) AM Emitters ?

BOBRR

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Location
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Hello,

Have a SDRPlay RSPdx, and a simple end fed long wire ant. outside.

Still fighting the "noise" I am receiving on 2 to 3 MHz AM all the time.
Have done the plug and unplug routine. Will keep at it.

Just curious about this, though:

What is the typical noise spectrum, and freq's, emitted by a "typical" LED light ?

Same question for a Fluorescent light ?

BTW: Are there any "known" military or governmental "emitters" in the 2 to 3 MHz range ? (U.S. or elsewhere)

Thanks,
Bob
 

KB4MSZ

Billy
Joined
Mar 12, 2018
Messages
396
Location
Tampa, Florida
Could you post a screen shot of your SDRUno waterfall showing the pattern? I have quite a bit of interference here and am also curious about what it is. I am located just a few miles north of US Central Command at MacDill Air Force Base in Tampa.

Here are a few of what I see:

20 Meters (and beyond)
1598795870240.png

40 Meters (and beyond)
1598796015520.png

80 Meters (and beyond)
1598796132574.png

160 Meters
1598796277403.png

10 Meters
1598796382429.png
 

BOBRR

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Premium Subscriber
Joined
Dec 15, 2004
Messages
1,116
Location
Boston, MA
Hi,

Tried to Attach my screenshot, but I guess too large.
Will try to simply include a pix of it in this reply.
If you don't see it, let me know and I'll try something else.

--Won't go; Msg. is:
Oops! We ran into some problems.
The uploaded file is too large for the server to process.--

Your Server ? Have a regular eMail that might accept it ? Or,...?

Have more or less come to the conclusion that the noise I see is external, but not 100% sure.
Thinking, "perhaps", mil or governmental ?
It's all the time, from 2 to 3 MHz am.
Have a SDRPlay RSPdx. Wondering if I am overloading it with too much Gain, or perhaps there
s some bleed over from some quite strong normal am broadcast stations about 10 miles away. I'm just outside of Boston.

Will try to figure some other way of sending pix; give me a day or two.

Wish my noise floor was as low as yours !

Stay in touch, and stay well, Bob
 

KB4MSZ

Billy
Joined
Mar 12, 2018
Messages
396
Location
Tampa, Florida
I'm curious if you located the source of your noise problem, I haven't. My noise is quite erratic, sometimes overnight it isn't there at all on 40 meters, sometimes it's at a low level, but usually it's quite bad. 80 and 160 meters follows suite but isn't as pronounced. Interestingly I have very little interference at the lowest frequencies, I can receive WWVB 24 hours a day (although weaker when the sun is up of course) on my RSPdx, my Yaesu FT-891 cannot hear it under any conditions. I guess RadioReference still isn't allowing you to post screen shots. I wonder if our interference pattern looks the same.
 

BOBRR

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Premium Subscriber
Joined
Dec 15, 2004
Messages
1,116
Location
Boston, MA
Hi,

No luck.
Still trying to track down.
I tried attaching a photo a while back, but I guess it didn't work.

Send me your eMail, and I'll do it the old fashioned way.

Stay well,
Bob rgsrose@comcast.net
 
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