[Elecraft] AC Pole Interference

[Tom W8JI]

Hi Mark,

> Hello fellow K3 Owners.  I have finally discovered that AC Interference 
> from the pole across the street is getting into my antenna and then of 
> course I see it on my S-meter on the K3.  On Saturday I had this 
> interference all day and I finally went out with a portable AM Radio and 
> found out that it was that particular pole.  What's amazing is that at 
> 10:15 PM the noise was gone and I went out to the pole again with my AM 
> radio and the noise was gone.  I have reported this to Philadelphia 
> Electric Company.  But the problem is that the interference is sporadic in 
> nature and doesn't happen all the time.
>
 See this:

http://www.w8ji.com/power_line_noise.htm

any of that look like your pole?

> Does anyone know if there is a filter that one can hook up to there 
> antenna that would eliminate this interference before it gets into my K3? 
> When I don't have the interference HF is a wonderfull thing, but when I 
> have the interference I get a lousy S-5 to S-7 reading on my S-Meter.  And 
> suggestions would be much appreciated!!  Mark KB3Z

No. Noise of short pulse width and low duty cycle can be blanked, but any 
noise reduction, other than phase cancelation methods, always causes a 
penalty on receiving.

It is best to fix it at the source.

73 Tom