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| SWR 80 m |
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| SWR 40 m |
 |
| |Z| 80 m |
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| |Z| 40 m |
Click on any graph to view it full size. These graphs show the effects of lengthening the ladder line feed while keeping the antenna length constant at 102 ft end-to-end.
Monday, March 6, 2017
Comparing 3 Feed Line Lengths
I added another 3 ft of 450-ohm ladder line to my antenna feed line, bringing the total length of ladder line to about 99 ft. Using data measured by my antenna analyzer, I compared the current data with what I collected with the previous lengths of 91 and 96 ft. Below are graphs that compare the SWR and impedance (magnitude) for the 80 m and 40 m bands.
Click on any graph to view it full size. These graphs show the effects of lengthening the ladder line feed while keeping the antenna length constant at 102 ft end-to-end.
Click on any graph to view it full size. These graphs show the effects of lengthening the ladder line feed while keeping the antenna length constant at 102 ft end-to-end.
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