In electronics, a Lecher line or Lecher wires is a pair of parallel wires or rods that . Kundt’s tube experiment which is used to measure the wavelength of sound. The Lecher wire experiment found in undergraduate laboratories is usually limited to the observation of the voltage distribution for open and. I had this experiment in my Physics Waves and Optics lab, so I of the frequently asked questions for the experiment: Lecher Line(Wire).

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You only do that if you want correct results. This short circuiting termination reflects the waves.

Using a Lecher Line To Measure High Frequency

Notify me of new comments via email. The Speed of Light. The wikipedia article has a good description of this phenomenon.

Why does this so drastically differ from the values in the datasheet? Because the speed of light in a transmission line is not the same as in vacuum. Also available on Arthur H.

In the photos you can see a measuring tape running the length of the experument for measuring the distance from the end of the Lecher line to the nodes. Less than half baked idea, but could a similar setup be used to detect the swinging length of a guitar string?

The frame must be made of a nonconductive material like wood, because any conducting objects near the line can disturb the eexperiment wave pattern.


Dictionary of Pure and Applied Physics. One answer is to put away the oscilloscope and use the rest along with a length of wire instead. Also in my setup the other end of the line is open, the wires are not connected together there.

Using a Lecher Line To Measure High Frequency | Hackaday

This site uses Akismet to reduce spam. That setup really helps de-mystify its mechanical equivalent at sonic frequencies, the transmission line speaker, and the currently popular mathematical model for it as described by Martin J. How about using a metal measuring tape for one of the transmission elements?

Here I thought it was men in overcoats and galoshes at the ticket counter of an Leche movie theatre. Modern Dictionary of Electronics. You are commenting using your Facebook account. An advanced treatise on alternating-current theory.

R Jessop [15] uses a Lecher line anode tank. Does that make sense? Fill in your details below or click an icon to log in: To really make this article shine, it would have been nice to go back and verify the measurements with some known standard.

The nodes are much sharper than the antinodes, because the change of voltage with distance along the line is maximum at dxperiment nodes, so they are used.

The other method used to find experkment nodes is to slide the terminating shorting bar up and down the line, and measure the current flowing into the line with an RF ammeter in the feeder line. The RF current is usually coupled into the line through a single turn loop of wire at one end, which can be held near a transmitter’s tank coil.


The length of the wires depends on the wavelength involved; lines used wlre measurement are generally several wirw long. In operation, the U end acts as a coupling link and is held near the transmitter’s tank coil, and the shorting bar is slid out along the arms until the transmitter’s plate current dips, indicating the first node has been reached.

In modern times small neon bulbs are often used. One problem with using glow discharge bulbs is their high striking voltage makes it difficult to localize the exact voltage minimum.

Lecher line – Wikipedia

Another angle showing the diode. Retrieved March 23, There is wooden base under wires. How do you test the oscillator circuit you just made that runs between MHz and MHz if all you have is a MHz oscilloscope, a few multimeters and a DC power supply?