On 4/11/2021 1:06 PM, Charles Plunk wrote:
 One tip; make sure you are tracking the right noise. I found out the 
hard way that many power line utility devices/poles emanate "noise" when 
you are nearby but may not be "the" noise that you are hearing in your 
station receiver. A break thru on my latest hunt was I re transmitted 
the noise over 440mhz FM from my hf station while it had a distinctive 
but varying pattern. Then compared to my 2m HT on AM with portable yagi 
by listening to them both while triangulating. Made a world of 
difference to tracking the right noise.
 
 Exactly right. My RFI tutorials begin by pointing out the differences 
between power line noise and electronic noise, then by showing how to 
tell what you're hearing and how to chase it. They are in the form of 
text and slides.
http://k9yc.com/KillingReceiveNoise.pdf
http://k9yc.com/KillingRXNoiseVisalia.pdf
73, Jim K9YC
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