- In this class, we will review last week’s material.
- Our review will be by means of a supposed move of your ham shack.
- In moving your ham shack, you added several feet of feedline to the antenna.
- For simplification, we are ignoring the velocity factor.
- How many half-wavelengths of feedline did you add?
- Why talk half-wavelengths instead of wavelengths?
- What phase does that represent at our allocated frequency?
- We have the vector impedance measured with the original configuration of feedline.
- What new vector impedance should we expect to measure with the additional length of feedline?
- We found that
- The net reactance changed from inductive to capacitive. Why?
- The impedance magnitude (Z) changed from 37 Ohms to 47 Ohms.
- The SWR remained UNCHANGED.
- Therefore, should we expect the antenna performance to
- improve
- degrade
- remain unchanged
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