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Electrical length eqn used in 8510TRL cal doc

Question asked by em_rocks on Oct 23, 2007
Latest reply on Oct 23, 2007 by antennas4space
Can someone tell me where the theory reference is for the following eqn.
Its located in "Network analysis applying the 8510TRL calibration for non-coaxial measurements"

Electrical length(cm)=15/(f1(GHZ)+f2(GHz))

THanks in advance