A. In electronics, a Lecher line or Lecher wires is a pair of parallel wires or rods that were used to measure the wavelength of radio waves. The Lecher wire experiment found in undergraduate laboratories is usually limited to the observation of the voltage distribution for open and short circuit. An improved Lecher wire experiment. To cite this article: M B Allenson et al Phys. Educ. 8 View the article online for updates and enhancements.

Author: Yozshulkree Vomuro
Country: Kenya
Language: English (Spanish)
Genre: Automotive
Published (Last): 10 April 2009
Pages: 189
PDF File Size: 14.10 Mb
ePub File Size: 18.63 Mb
ISBN: 369-3-45082-427-6
Downloads: 39159
Price: Free* [*Free Regsitration Required]
Uploader: Dishura

Could be wrong, but I believe the wood right next to it will have a significant effect.

File:Lecher wires and oscillator png – Wikimedia Commons

New Jersey Society for Amateur Scientists. Radio frequency currents applied by the triode oscillator left form lechwr waves along the line. The Principles of Electric Wave Telegraphy. Two methods are employed to find the nodes.

I wonder how easy it would be to use a fluorescent tube and measure of light intensity. Lecher line circuits can be used for the tank circuits of UHF power amplifiers. The Speed of Light. The oscillator is a voltage controlled oscillator. Hirtle chart for further explanation. One of those ways is to have the bar be two terminals of a neon bulb.


A Lecher line demonstration kit used to measure the frequency of a vacuum tube UHF oscillatorfrom a radio magazine. Radar circuit analysis by United States. Notify me of new comments via email. From Wikipedia, the free encyclopedia.

A Lecher line is a pair of parallel uninsulated wires oecher rods held a precise distance apart. Lechef line wavemeters are usually built on a frame which holds the conductors rigid and horizontal, with a track that the shorting bar or indicator rides on, and a built-in measuring scale so the distance between nodes can be read out. Also available on Arthur H. Short lengths of Lecher line are often used as high Q resonant circuitstermed resonant stubs. This is indicated by a light bulb on the oscillator across the input to the line.

The resulting data and graph are shown below. An advanced treatise on alternating-current theory.

Another way would have been to use e. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. The next one further away is a full wavelength.

Using a Lecher Line To Measure High Frequency

In the photos you can see a measuring tape running the length of the wires for measuring the distance from the end of the Lecher line to the nodes.


The Lecher line, invented by Ernst Lecher inwas widely used to measure the frequency of short wave UHF transmitters during the s. By using our website and services, you expressly agree to the placement of our performance, functionality and advertising cookies. Views View Edit History. You might have to remove wirr from part of it the backside? Fill in your details below or click an icon to log in: Lecher wire demonstration apparatus with lamp for indicating the point of resonance.

The voltage goes to zero at nodes located at multiples of half a wavelength from the end, with maxima called antinodes located midway between the nodes.

Modern Views of Electricity, 3rd Ed. Lecher and early researchers used long thin Geissler tubeslaying the glass tube directly across the line. More fun discovering Lecher Lines though. Wirr for more high frequency measuring projects here on Hackaday? Retrieved from ” https: The one objection is: