Jim, I think you may have answered a question that's been on my mind for years.

Some time ago an advertisement for coax cable in QST said that a certain cable 
had "80 dB shielding". I had never seen a spec for this before. Could they have 
been referring to the leakage from inside to outside; outside to inside (as you 
were describing); or both? Or something else?

Al  W6LX


> Poor connections, or poorly shielded coax, 
> or both, can couple common mode current 
> from the outside of the coax to the inside of 
> the coax at low levels. 
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