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Re: [RFI] Help finding a source

To: David Eckhardt <davearea51a@gmail.com>
Subject: Re: [RFI] Help finding a source
From: Michael Martin <mike@rfiservices.com>
Date: Wed, 04 Dec 2019 17:19:10 -0700
List-post: <mailto:rfi@contesting.com>
your noise is caused by loose hardware on the power line equipment.
the three spikes you see per group represent three discharges per half cycle

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On Dec 4, 2019, 5:07 PM, at 5:07 PM, David Eckhardt <davearea51a@gmail.com> 
>I give up.        It's power line discharge.
>Dave - WØLEV
>On Wed, Dec 4, 2019 at 11:24 PM Michael Morgan <michael@aa5sh.com>
>> I was hoping to get some help identifying a potential source for some
>> that started a few weeks ago.  I posted some pictures and audio clips
>> 20 and 40 meters on my webpage.  Thought it may be easiest there I
>hope it
>> is ok.  https://www.aa5sh.com/?p=328
>> I tried to get some screenshots from my 7610.  On 20M the Noise
>> does  a decent job of removing the noise but on 40M it is a bit two
>> I have tried turning the main breaker off to my house and use a
>> radio (Recent RS-918) off a battery and the noise is still there.  I
>> walk around my property and noticed no real differences.  The odd
>thing is
>> it's kind of random.  It has been going to 30 Mins or so and it just
>> stopped for a minute while I've been typing this email for a minute
>or so
>> then started back up.
>> Then at lunch today I took a break and remoted home since I saw where
>> was open and there was no noise for that 30-40 minutes.
>> I appreciate any guidance you can provide.  In my years of radio
>anytime I
>> have had noise problems I have always been able to narrow it down to
>> wall-wart or battery charger.
>> 73
>> Michael, AA5SH
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>> RFI@contesting.com
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>One very last try:  Copy to Word.  Eliminate image.  Copy test with no
>image.  Paste to email.  If this doesn't work, I give up:
>In your third image, the audio spectrum, the groups (first peak of
>group to first peak of next group) is 17.5 ms.
>The period on one cycle at 60 Hz is 16.67 ms.  Very close.  The sound
>also sounds suspiciously like 60 Hz discharge from the power
>somewhere in your vicinity.  I usually detect this at 120 Hz as the
>discharge occurs at both the + and - peaks of the sine wave.  But not
>this case.  In the time domain, I also usually detect an exponentially
>decaying envelope for each discharge.  No so in this case.  But,
>considering the period and sound, I'd guess its due to power
>discharge in you area.  Walk the power lines with your battery-powered
>radio.  When you find a pole that is particularly, kick the pole hard
>observe any change in the character of the sound on your radio.  If no
>change, its not at that pole.  Continue searching.  Also, damp weather
>usually exacerbates the discharges as does dusty conditions.
>Dave - WØLEV
>*Dave - WØLEV*
>*Just Let Darwin Work*
>*Just Think*
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