All of our electricity comes out of the ground.  Everything is underground here 
except for a few poles a number of blocks away.  I have heard that kind of 
noise before from insulators (dirt, carbon, etc.) and this is definitely not 
that.

Besides, that would just not have this exact on off switching behavior as if 
some tool were being used.

phil


On Feb 19, 2014, at 2:23 PM, Bill W2BLC <[email protected]> wrote:

> Based on my past experience - I would be thinking an arc welder (or wire or 
> some such similar). If not that, then you might want to check for carbon 
> trails on HV insulators along the road (usually very effected by the 
> weather). As a third guess - and a worst case scenario - a serious problem in 
> your home electrical system (or a nearby neighbor).
> 
> You do need to eliminate the latter ASAP. Do you notice any changes in line 
> voltage when you experience this noise?
> 
> Bill W2BLC K-Line
> 
> 
> 
> 
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