[EIDXA] RFI from streetlights

[Jim Spencer]

Joe,

Can you display and take a photo of the audio.  That can tell us a lot about 
the noise source.  I can easily display that on my DMU-2000 or my Tektronics 
and although I can't recognize all of the waveforms, the most common ones 
from the power lines are easy to spot.

73,  Jim

-----Original Message----- 
From: Joe Hetrick
Sent: Thursday, March 20, 2014 8:53 AM
To: eidxa at mailman.qth.net
Subject: Re: [EIDXA] RFI from streetlights


Thanks Terry,
This may fit with something new I've had.

I had posted elsewhere; but does anybody have audio of what they sound like?

Below is something new-ish in my area that is killing 20/15/17/10, 20
and 17 are the most affected.  It appears to my SE.  I'm going to try
and go walking with a handheld AM today to see if it's not something easy..

Couple of caps from the P3:
http://webmail.bitjanitor.net/~jhetrick/15m-south.bmp
http://webmail.bitjanitor.net/~jhetrick/20m-south.bmp

Some audio:
http://www.frogstar.org/radio/audio/DX/2014-03-16_14-25-13_QRM-17M.mp3

You may be able to hear on 17M when I kicked the NR off.

http://www.frogstar.org/radio/audio/DX/2014-03-16_14-24-20_QRM-20M.mp3

It appears all the time; I had thought it intermittent, but lately I've
been more active and it's certainly QRV all the time I've been listening.

I can null it on 20M very specifically at about 350 degrees; but very
narrow.  My yagi isn't very high; on 10, I can find multiple nulls as
you'd expect.  I am going to wander the streets to see if I can find it
by hand tho..

The humps are about 60khz apart like a switcher, but, I've done the
in-house test and killed all power and run from battery and it's not my QTH.

Since KU0A lives near, I asked him to see if he hears it as well.  Maybe
between the two of us we can pinpoint it; I'm hoping its on my street.
It doesn't sound like anything I've found on the audio files I've
listened to.  It's not nasty enough or intermittent enough to be a
running plasma.

73,

VKN


http://webmail.bitjanithttp://webmail.bitjanitor.net/~jhetrick/15m-south.bmpor.net/~jhetrick/15m-south.bmp
On 03/20/2014 08:45 AM, Terry Cellman wrote:
> Alliant energy in Washington Iowa has started to replace their 
> streetlights
>
> with LED lights. They have been receiving some complaints about these
>
> Lights causing RFI . AB0DX, Mark who works for Alliant in Washington.
>
> was asked by his boss to see if there were hams in Cedar Rapids who
>
> had experienced RFI from these new LED lights. Mark says they can be
>
> identified from the older style lights by their shape. They are flatter 
> and
>
> more square in shape than the old style lights.
>
>
>
> If you confirm that one of these LED streetlights is causing RFI you can
>
> Contact Mark at  ab0dx at arrl.net.
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