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).

Author: Dut Moogurisar
Country: Nepal
Language: English (Spanish)
Genre: Personal Growth
Published (Last): 19 September 2014
Pages: 359
PDF File Size: 16.10 Mb
ePub File Size: 17.13 Mb
ISBN: 431-1-59084-817-5
Downloads: 76568
Price: Free* [*Free Regsitration Required]
Uploader: Shakagal

Using a Lecher Line To Measure High Frequency | Hackaday

Does that make sense? In modern times small neon bulbs are often used. Notify me of new posts via email. If the indicator has too low an impedance it will lechrr the standing wave on the line, so a high impedance indicator must be used; a regular incandescent bulb has too low a resistance.

Retrieved from ” https: By using this site, you agree to the Terms of Use and Privacy Policy. This short circuiting termination reflects the waves.

The frequency f of the waves can be calculated from the wavelength and the speed of the waves, which is the speed of light c:. Also exprriment on Arthur H. Commercially available and ohm twin lead balanced ribbon feeder can be used as a fixed length Lecher line resonant stub. Wir care, Lecher lines can measure frequency to an accuracy of 0.


This site uses Akismet to reduce spam. How about using a metal measuring tape for one of the transmission elements? Lecher line circuits can be used for the tank circuits of UHF power amplifiers. Looking for more high frequency measuring projects here on Hackaday? For parallel wires the formula for lcher per unit length C is.

You guys should do a retrotachular on ECGs.

Using a Lecher Line To Measure High Frequency

Then the distance from the end of the link to the shorting bar is a half-wavelength. Radio electronics Distributed element circuits. They are used because at UHF frequencies the value of inductors and capacitors needed for ‘ lumped component ‘ tuned circuits becomes extremely low, making them difficult to fabricate and sensitive to parasitic capacitance and inductance.

An advanced treatise on alternating-current theory. A Lecher line consists of two parallel wires or rods that form a balanced transmission line.

The shorting bar should always be slid outaway from the link end, not into avoid converging on a higher order node by mistake. 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 one objection is: Retrieved March 24, There is wooden base under wires. I wonder how easy it would be to use a fluorescent tube and measure of light intensity. By using our leecher and services, you expressly agree to the placement of our performance, functionality and advertising cookies.

Lecher line – Wikipedia

Lecher line, oscillator and other equipment. One difference between them is that transmission line stubs like Lecher lines also resonate at odd-number multiples of their fundamental resonant frequency, while lumped LC circuits just have one resonant frequency.


Less than half baked idea, but could a similar setup be used to detect the swinging length of a guitar string? 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. The tuning necessary to select different stations is done by varactor diodes across the Lecher line.

An improved Lecher wire experiment

A Lecher line is a pair of parallel uninsulated wires or rods held a precise distance apart. When attached to a source of radio-frequency power such as a radio transmitter, the radio waves form standing waves along their length. Enhanced version and more background: The oscillator is a voltage controlled oscillator. The resulting data and graph are shown below. The frame must be made of a elcher material like wood, because any conducting objects wiee the line can disturb the standing wave pattern.

I wonder if this same effect would work even if the two Lecher wires were not connected at all- I think iwre might because presumably inductance is conveyed by light particles.