[TowerTalk] RG400 Measured Data

[Jim Brown]

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