# ARRL

## KJ4ZCV

 Joined: Mon, Nov 15th 2010, 10:55 Roles: N/A Moderates: N/A

### Latest Topics

Topic Created Posts Views Last Activity
Basic Antennas - Seeking clarification Feb 8th 2021, 05:04 2 5,133 on 8/2/21
Basic Antennas - Seeking clarification Feb 8th 2021, 05:03 4 5,931 on 8/2/21

### Latest Posts

Topic Author Posted On
Basic Antennas - Seeking clarification KJ4ZCV on 8/2/21
Thank you very much - that helped a lot
Basic Antennas - Seeking clarification KJ4ZCV on 8/2/21
Hello - I’m reading ARRL’s Basic Antennas book, and on page 5-4, it says:
The load impedance, resistive or complex repeats every half wavelength, for example. The impedance goes to the opposite extreme in odd multiples of a quarter wavelength. For example, our 25 Ohm load would get transformed to 100 Ohm in quarter or three quarter wavelength transmission line sections and vice versa.

- What is meant here by “opposite extreme”? Opposite to what? What extreme?
-How is the 100 Ohm value determined?
- What is meant by “vice versa” here? Zero Ohms?

Is there anyone who can refer to this section of the book able to throw light on this?

Thank you!
Basic Antennas - Seeking clarification KJ4ZCV on 8/2/21
Hello - I’m reading ARRL’s Basic Antennas book, and on page 5-4, it says:
The load impedance, resistive or complex repeats every half wavelength, for example. The impedance goes to the opposite extreme in odd multiples of a quarter wavelength. For example, our 25 Ohm load would get transformed to 100 Ohm in quarter or three quarter wavelength transmission line sections and vice versa.

- What is meant here by “opposite extreme”? Opposite to what? What extreme?
-How is the 100 Ohm value determined?
- What is meant by “vice versa” here? Zero Ohms?

Is there anyone who can refer to this section of the book able to throw light on this?

Thank you!