[EIDXA] RFI from streetlights

[Joe Hetrick]

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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