Here's measured data for Harbor Industries RG400.
k9yc.com/RG400DataMF-HF.png
Data was obtained by S11 sweeps (1-30 MHz) using VNWA, exporting as S1P
files to AC6LA's Zplots spreadsheet for Excel. ZPlots does the math to
compute and plot Zo, VF, and attenuation vs frequency, and finds the
constants K0, K1, and K2 in the Johnson transmission line model. The
lower plot is computed from the raw data, the top two plots come from
the model. Zo (nom) and VF (nom) are the values to which the curves are
asymptotic at VHF.
These curve shapes are predicted by the wave equations and are typical
of virtually all transmission lines.
73, Jim K9YC
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