SCn More December 13th, 2022

  • In this class, we will review last week’s material.
  • Our review will be by means of the exact same supposed move of your ham shack as last week.
  • In moving your ham shack, you added several feet of feedline to the antenna.
  • Last week we ignored the velocity factor. Not this week!
  • How many half-wavelengths of feedline did you add?
  • Why talk half-wavelengths instead of wavelengths?
    • This is a hard conversation but understanding this concept moves you out of the cookbook.
  • 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

Login into the Zoom session using:

https://us02web.zoom.us/j/83759616199 the passcode is 680541