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.

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I measured the frequency by spanning three of them and then multiplying by three.

Lecher line – Wikipedia

You might have to remove paint from part of it the backside? One answer is to ledher away the oscilloscope and use the rest along with a length of wire instead. Looking for more high frequency measuring projects here on Hackaday? Radar circuit analysis by United Eire. How does it work — does anybody know? From Wikimedia Commons, the free media repository. The shorting bar should always be slid out pecher, away from the link end, not into avoid converging on a higher order node by mistake.

Its namesake is Ernst Lecher, a physicist from Austria who perfected the practice in This page was last edited on 22 Novemberat Or if you rather use technology from 2 centuries ago, use that I suppose. A major attraction of Lecher lines was they were a way to measure frequency without complicated electronics, and could be improvised from simple materials found in a typical shop.


From Wikipedia, the free encyclopedia. PD US not renewed. I made a loop like the diode loop but without the diode and hooked it up to my Tektronix TDS MHz oscilloscope probe and probe ground and tried it.

Lecher wire wavemeter | instrument |

You are commenting using your ,echer account. This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. Then the distance from the end of the link to the shorting bar is a half-wavelength.

Lecher line circuits can be used for the tank circuits of UHF power amplifiers. Quarter-wave Lecher lines are used for the tuned circuits in the RF amplifier and local oscillator portions of modern television sets. Short lengths of Lecher line are often used as high Q resonant circuitstermed resonant stubs.

One difference between them is that transmission line stubs like Lecher lines also resonate at odd-number multiples of their fundamental resonant frequency, while wiee LC circuits just have one resonant frequency. You wre commenting using your WordPress. When the screwdriver is still less than half a meter from the oscillator end, and at the node for the first half-wavelength, the voltage across the diode is above 0.


The frequency f of the waves can be calculated from the wavelength aire the speed of the waves, which is the speed of light c:. There seems to be something to that.

Therefore the magazine’s copyright was not renewed and it is in the public domain. Also in my setup the other end of the line is open, the wires are not connected together there.

Lecher wire wavemeter

Thanks for suggesting that. Views View Edit History. The high voltage of early transmitters excited a glow discharge in the gas.

By sliding a conductive bar that bridges the two wires along their length, the length of the waves can be physically measured. Learn how your comment data lecuer processed.

Radio frequency currents applied by the triode oscillator left form standing waves along the line. R Jessop [15] uses a Lecher line anode tank.