On 3/21/2012 3:33 PM, Al Lorona wrote: > Some time ago an advertisement for coax cable in QST said that a certain > cable had "80 dB shielding".
I'd call that an advertising claim. Real specifications for this are quantities like the Transfer Impedance, which is the ratio between the differential voltage inside the coax as a result of current on the outside of the coax. That ratio varies a LOT as a function of frequency. The lower the value of that transfer impedance, the better the shielding. The lower limit on the transfer impedance is the resistance of the shield. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
