[TowerTalk] Weird RFI at remote location - Solved

[Jim Brown]

On 1/21/2021 5:03 PM, Ignacy Misztal wrote:
> A few lessons. It seems that 15m travels really well on the power lines
> (more than 1/2 mile in this case), and the combined re-radiation from many
> poles leads to false directions.

Always assume that noise is radiated directly by wiring close to the 
source, especially at higher frequencies, as well as being conducted 
along power lines. The higher the frequency of the noise, the less it 
propagates along power lines. And, in general, noise is attenuated when 
passing through a transformer.

This is why experienced chasers of power line noise, which is impulse 
noise, thus quite broadband, look for it at the highest frequencies 
where they can hear it.

The best way to identify impulse noise is on a relatively fast 
waterfall, where it will show up as horizontal lines.

73, Jim K9YC