__-----__ / d_inch \ Impedances inside coax / ___ \ | / ^ \ | | | |_ |__\| Z_ohms = sqrt(L/C) \ \___/ // \ D_inch/ \__ __/ ----- Z_ohms = 138*log(D_inch/d_inch)/sqrt(E) C_pf/ft = 7.36*E/log(D_inch/d_inch) L_uH/ft = 0.14*log(D_inch/d_inch)) Delay_ns/ft = 1.016*sqrt(E) Propagation_%_c = 100/sqrt(E) CutOffFreq_Ghz = 7.5/( sqrt(E)*(D_inch+d_inch) )