While recently looking at the data sheet for LMR 400 Coax, I think I may have found an answer to a question I've been asking for many years concerning how well a shield works in a cable. The data sheet says the shielding effectiveness is > 90 db. Does anyone know if that represents a standard measurement suite? Or is that just unique to that cable vendor? You just don't find many cables that attempt to quantify how well their shielding works.

rw