Talk:Lecher line

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Lecher lines are not the same as strip line, they are parallel pieces of conductor spaced to form a balanced transmission line- either open or short circuited at the end. --Light current 21:29, 27 December 2005 (UTC)[reply]

You are right, but I did state that strip line is an alternative to Lecher lines in UHF/SHF electronics. I think that becuase many UHF RF power amp designs use Lecher lines or stripline that the page on Lecher lines should remain separate from a general page on transmission lines. I think that they are sufficently a important sub set of transmission lines to warent a page of their own.

I think that at this early stage that we should allow to parallel developement of Lecher lines and other transmission lines.Cadmium 22:26, 27 December 2005 (UTC)[reply]

Im proposing to merge it with transmission line as I dont think theres enough matl on Lecher lines to warrant its own page. I also made it an AfD. Plese feel free to contribute material to the transmission line page on Lecher lines-- I have already stared the paragraph. THanks. --Light current 22:32, 27 December 2005 (UTC)[reply]

OK, I have looked at both pages and I can see how things are cooking up. I think that if the transmission line page is added to then we can move forwards without the Lecher line page. So even while I have been responsible for making the Lecher line page I saw it can go.Cadmium 22:40, 27 December 2005 (UTC)[reply]

OK thanks for your cooperation!!--Light current 22:42, 27 December 2005 (UTC)[reply]

Standing wave measurement

Aa s very useful way of measuring the node positions in metric radar aerial design we used a quarter wave stub terminating in a metal box that served as the shorting bar into which was mounted a micro-ammeter tapped across the stub at a suitable way down to give a maximum deflection for the antinode in a particular set-up. This was run along a stretch of open-wire feeder between the source and load and by presenting effectively an open circuit impedance resulted in virtually no disturbance to the standing wave pattern and enabling very accurate determination of the null points. After calibration by working into a matched load the characteristics of the array under test were obtained by measuring with a ruler the change in node positions, indicating a capacitive or inductive load, then plotting the results on a Smith chart to derive adjustments of various parameters to obtain the best match to deliver maximum power to the array over the desired operating frequency range. —Preceding unsigned comment added by Marconibod (talk • contribs) 15:52, 21 July 2010 (UTC)[reply]

Units

For parallel wires the formula for capacitance is

l = length C = capacitance per meter

$C=\pi \epsilon _{0}\epsilon _{r}/\ln {(2D/d)}$

For one, the lenght l isn't used, but also the units are only capacitance per meter if $\epsilon _{0}$ has those units in the unit system in use. In Gaussian units, capacitance has units of cm, for example. Gah4 (talk) 17:58, 9 September 2015 (UTC)[reply]

\epsilon _{0}

is unitless in the Gaussian system, and so is capacitance per cm. But you are right that it would be better to say capacitance per unit length rather than specifying the units. SpinningSpark 08:09, 12 September 2015 (UTC)[reply]

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