LECHER WIRE PDF

February 7, 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? One answer is to put away the oscilloscope and use the rest along with a length of wire instead. Form the wire into a Lecher line. What follows is a bit about Lecher lines, how I did it, and the results.

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February 7, 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? One answer is to put away the oscilloscope and use the rest along with a length of wire instead. Form the wire into a Lecher line. What follows is a bit about Lecher lines, how I did it, and the results. 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.

Its namesake is Ernst Lecher, a physicist from Austria who perfected the practice in Also in my setup the other end of the line is open, the wires are not connected together there. A metal bar, or a screwdriver in my case, is put across the width of the two parallel wires, shorting them.

As I slide the bar along the wires, it influences the waves. One of those ways is to have the bar be two terminals of a neon bulb. The bulb goes out at the nodes, where the voltage is zero. 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.

Part of that loop is a 6. The oscillator puts electromagnetic waves on the Lecher line using induction. In the first photo above, the oscillator is pulled back a bit to make things clearer. As shown in the above photos, I added the diode loop to the collection of loops at the end of the Lecher line. 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.

When the screwdriver is between nodes, the voltage is less than 0. The next one further away is a full wavelength. The oscillator is a voltage controlled oscillator. The resulting data and graph are shown below. Lecher line data Graph of the data Looking for more high frequency measuring projects here on Hackaday?

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Vujind How does it work — does anybody know? Thank you for this. Why does this so drastically differ from the values in the datasheet? A metal bar, or a screwdriver in my case, is put across the width of the two parallel wires, shorting them. In the photos you can see a measuring tape running the length of the wires for measuring the distance from the end esperiment the Lecher line to the nodes. Lecher line The next one further away is a full wavelength.

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Lecher line

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