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).
|Published (Last):||24 July 2004|
|PDF File Size:||9.55 Mb|
|ePub File Size:||11.77 Mb|
|Price:||Free* [*Free Regsitration Required]|
In precision wavemeters an RF voltmeter is used. A Lecher line consists of two parallel wires or rods that form a balanced experimeng line. Also available on Arthur H. Commercially available and ohm twin lead balanced ribbon feeder can be used as a fixed length Lecher line resonant stub. In other projects Wikimedia Commons.
Using a Lecher Line To Measure High Frequency
How about using a metal measuring tape for one of the transmission elements? The resulting data and graph are shown below.
Enhanced version and more background: 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.
Radio electronics Distributed element circuits. Lecher 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. Thank you for this. R Jessop  uses a Lecher line anode tank.
Views Read Edit View history. Then the distance from the end of the link to the shorting bar is a half-wavelength.
Using a Lecher Line To Measure High Frequency | Hackaday
You might have to remove paint from part of it the backside? Plain Lecher line and with test equipment in use The end with a loop A Lecher line consists of two parallel wires or rods that form a balanced transmission line.
Graph of the data.
The frame must be made of a nonconductive material like wood, because any conducting objects near the line can disturb the standing wave pattern. With care, Lecher lines can measure frequency to an accuracy of 0. The Electrical Engineer, Ltd.
This short circuiting termination reflects the waves. Leave a Reply Cancel reply Enter your comment here A metal bar, or a screwdriver in my case, is put across the width of the two parallel wires, shorting them.
That setup really helps de-mystify its mechanical equivalent at sonic frequencies, the transmission line speaker, and the currently expeeriment mathematical model for it as described by Martin J.
Form the wire into a Lecher line. This page was last edited on 10 Novemberat Why does this so drastically differ from the values in the datasheet? Another way would have been to use e.
An improved Lecher wire experiment
Apparently the screwdriver causes a reflection creating a standing wave of voltage and current on the line. For parallel wires the formula for capacitance per unit length C is.
When attached to a source of radio-frequency power such as a radio transmitter, the radio waves form standing waves along wlre length. 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.
More fun discovering Lecher Lines though. One answer is to put away the oscilloscope and use the rest along with a length of wire instead. Retrieved from ” https: