[RFI] How far does RFI travel?

KD7JYK DM09 kd7jyk at earthlink.net
Mon May 9 23:56:10 EDT 2016

It depends...

I tracked down one source that covered 18 square miles.  I suspect it 
covered a much larger area, but after covering that area, I found it and 
looked no farther.

Although not RFI, I tracked a ~5W signal source on a 10" antenna in a 
building on HF roughly 45 miles across several valleys, two ranges of high 
hills and a lake, so even a relatively low powered signal blocked by most 
everything between a city and rural area you can image can get out when you 
least expect it.

One RFI book I have mentions anything within 30 miles as being a problem, 
another, anything within line of sight, which is pretty accurate.


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