Jim Brown wrote:
>>> Can you make sweeps with far end open and short, then export to AC6LA's
ZPlots Excel spreadsheet and have it compute the TL parameters? This might
provide some clues.
>>> Note that ZPlots only runs in Excel, not alternative spreadsheets.
Similar calculations using Zoc/Zsc measurement files can also be done using
SimNEC. SimNEC is free and can run under Windows, Mac, and Linux systems.
Here's an example using Zoc/Zsc measurements made by KN5L for 24.9 feet of
RG-174. Red is the calculated Matched-Line Attenuation in dB/100ft, left
(log) scale. Blue is calculated |Zo|, right (linear) scale. Green is
calculated VP% (VF * 100), right scale. Sweep is from 10 kHz to 100 MHz,
log scale.
https://ibb.co/d0YhNhJ6
SimNEC can be downloaded here: https://www.ae6ty.com/smith_charts/
Please email me directly for a copy of the SimNEC model and the two sample
Zoc/Zsc measurement files.
Dan, AC6LA
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