Saturday, April 20, 2019

Measure radio frequency with wood and wire - experiments with a lecher line

OK it's not quite antennas but it is a transmission line. And transmission lines have many applications in antenna systems. Not only do they form the connection between the transceiver and the antenna but they have other applications like impedance matching at the driven elements of antennas. And, in a crude way, you can determine wavelength and measure frequency.

Below is a video showing experiments I did with possibly the original form of transmission line called a Lecher line.  All I needed as a source of RF (a UHF transceiver) and an RF indicator in the form of an LED.

PS: Want to read more about antennas and other amateur radio topics? These books could be of interest. Available in both electronic and paperback.

1 comment:

  1. Very interesting! Simple, quantitative experiments that anyone can do without investing in expensive gear.
    I am still struggling to understand why a certain antenna or feed-line presents a particular impedance. I think it has to do with the actual resonant frequency and the length of wire. But the detail is often glossed over in basic articles and it is just stated that the value is so many ohms.


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