Jim,
Tnx for providing the data
73,
N2TK, Tony
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Jim
Brown
Sent: Friday, March 16, 2018 3:34 PM
To: towertalk reflector <towertalk@contesting.com>
Subject: [TowerTalk] RG400 Measured Data
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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