[RFI] How much RF does your power company deliver along with the AC?

Jim Brown jim at audiosystemsgroup.com
Fri Aug 21 11:38:58 PDT 2009

On Fri, 21 Aug 2009 13:15:20 -0500 (CDT), Christopher E. Brown wrote:

>With power back, even with everything but a couple lights (filament, not 
>fl), strong RF on the AC lines, and s5 - s7 on the dipole.

>Starting to think the best option would be a good filter between the 
>disconnect and sub-panel

Your proposed solution is based on the assumption (almost certainly 
false) that the noise you hear is coupled into your home on power lines. 
The FAR more likely conclusion to be be drawn from your observations is 
that when the power in your neighborhood is off, the many noise sources 
in your neighborhood (and in your own home) cannot produce noise. Much of 
that noise is RADIATED by power lines (both inside and outside of homes 
where that noise is produced), or by other wiring connected to those 
noise sources, and picked up by your antenna. And, of course, faulty 
insulators on power lines may produce noise, which the power lines also 

Unfortunately, there is no magic bullet you can apply at your QTH. That 
noise still must be eliminated at the source. The most you can do is use 
antenna directivity (and common mode chokes) to minimize what you hear of 


Jim Brown K9YC

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