[EIDXA] RFI from streetlights

Thu Mar 20 11:57:48 EDT 2014

This may or may not work :)

http://webmail.bitjanitor.net/~jhetrick/AM-17M-noise.jpg

http://webmail.bitjanitor.net/~jhetrick/CW-17m-noise.jpg

VKN
On Mar 20, 2014, at 9:57 AM, Joe Hetrick <jhetrick at bitjanitor.net> wrote:

> If I run in AM and then cap it with an audio analyzer on my PC will that be sufficient, you think?
> 
> I did notice that the few sources I found, only had AF spectrum and not RF spectrum pics.
> 
> I dug more and found some archive.org stuff of powerline noise and it seems similar.  It's not pulsey as if it were data traffic of some sort.
> 
> 
> 
> On 03/20/2014 09:30 AM, Jim Spencer wrote:
>> 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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