University Of Charleston
ELEC 222
I. Objectives
To be able to understand basic principles about lecher line
To be able to generate desired output from Matlab
To be able display plot of the gathered date for illustration
II. Brief introduction
Lecher line is an early device used to measure wavelengths of frequency from frequency
generators or transmitters. In
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I. Objectives
To be able to understand basic principles about lecher line
To be able to generate desired output from Matlab
To be able display plot of the gathered date for illustration
II. Brief introduction
Lecher line is an early device used to measure wavelengths of frequency from frequency
generators or transmitters. In the early times, there were no frequency meters where one can
measure frequency and its wavelength so this was created to physically measure them. This
device is composed of two wires or rods that are parallel to each other at a constant distance
around 1 to 10 cm that form a short length balanced transmission line. On one end of the line, the
radio frequency is connected to be measured by the device. One end is connected with a
conductive bar to physically measure the length of the wave. A conductive bar is placed on the
parallel lines forming a somewhat short circuit termination to reflect and interfere outgoing
waves to create sinusoidal standing wave of voltage and current. The wave produces a maxima
and minima that is used to determine the wavelength. The maxima are called antinodes and the
zero or minima are called nodes. In between these nodes or antinodes are the measurements of a
half wavelength such that when multiplied by two, the length of the wavelength is measured.
After measuring the wavelength, the frequency is measured using the formula below:
ℷ=
cf
F= Frequency (Hz)
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