[RFI] Recent 40 Meter AC noises?

Dave Cole dave at nk7z.net
Thu Aug 30 12:51:57 EDT 2012

Is your beam a 40 meter beam?  Do any of the folks hearing it have 40
meter beams, if so, what headings are you each showing.
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On Thu, 2012-08-30 at 12:35 -0400, Paul K. wrote:
> Group,
> The past few weeks, not only me, but several folks I talk to around 
> 7.260 in the mornings have complained about a "AC hum."  I have watched 
> this hum on the panadapter.  It appears to be spread evenly across the 
> band, no peaks or dips.  On the panadapter the spikes appear at about 
> 120Hz interval, about 3 to 6 dB above the noise.  I have rotated the 
> beam and found the peak level to be approximately 135 degrees.  It has 
> been confirmed by a station in western Missouri, central Indiana
> and Annapolis Maryland.  This noise has been present nearly every 
> morning for the past 2 weeks, but I did not hear or see it today.
> When this is on it does not sweep or pulse.  It is just simply present. 
> I believe due to the wide spread reception of the exact same noise by 
> stations in vastly different areas the possibility of something locally 
> to any of us is highly remote.
> So the curiosity is up.  What do you folks think we are hearing, and are 
> any of you hear other reports about it.
> Thanks.
> Paul K.

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