Correction to number 1... Make that 120 HZ, not 720. Or twice sixty
hertz. That I understand I think...
This looks like a power line sparking, or a motor... Can someone with
more experience assist in IDing this?
Dave
NK7Z
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On Sat, 30 Apr 2011 19:47:51 -0700
Dave Cole <dave@nk7z.net> wrote:
> Hi,
>
> Well, I know what it isn't! I thought I had a noise pinned down to a
> house. The noise at the house is gone, and the noise at my place
> persists... All of 40 meters is shot. It is frequency specific
> however, starts around 6.5 MHz, and ends around 9.5 MHz, slow build up
> and drop as I sweep. Used a BWD-90, broadband antenna to verify it was
> not my antenna BW causing the tight frequency range, and a portable SW
> radio, it really is between those frequencies...
>
> I took several measurements of the audio portion as viewed by my
> computer on the radio audio output, and I found some very interesting
> things...
>
> 1. There is an audio pulse every 720 Hz or 12 times 60. This makes
> me think it is power line related, although I have no idea why 720
> Hz... 2. The noise is on 7 X 24 X 365
> 3. It appears to be spark like in nature, see expanded and wide views
> of waveform as captured on an O-Scope. Can someone verify this
> assumption please?
>
> Can anyone suggest what this might be? See:
> http://db.tt/eSA0bq4
> for images, and a sound cut as an MP3.
>
> Thank you,
> Dave
> NK7Z
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