[Elecraft] OT Local QRN what is it? UPDATE!

[Paul Christensen]

> I would look around  for some type of commercial line filter  that could
> be placed in the line.

Before purchasing a line RFI/EMI filter, the noise path and manner of 
propagation requires investigation.  If RFI radiation is occurring as a 
result of coupling from a power supply or display module (for example) onto 
a cable wiring harness but is not associated with the AC line path, then 
adding a line filter is a wasted expense.

Techniques used for investigating and localizing a noise path can be found 
in the RFI mail list archives.

Paul, W9AC