I think he was looking for ideas, maybe someone else's experience with a 
similar interference, thats all.
My advice besides errant street lights would be to go looking with a portable 
receiver and keep an open mind.  
Of course, check your own home first.  
Dale, k9vuj
> 
> "we could all reply and list all sorts of things that it might be…" 
> Nov 11, 2013 11:27:29 AM, af5cc@fidmail.com wrote:
> 
> I have an RFI problem that mostly shows up during the day, and affects most 
> bands, although I notice it most on 15 and 12 meters as I am on those bands 
> more during the day. It is a buzzing type noise that comes in around S6 or 
> so on my Icom 706MKII, and the NB won't do anything about it. It doesn't 
> show up all of the time, but comes and goes, It seems to cycle with 4 
> seconds on and 3 seconds off, and sometimes will cycle quicker than that. 
> Anyone else seen an RFI issue like this and have any idea what it might be? 
> It doesn't seem to occur at night.
> 
> 73 John AF5CC 
> 
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