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Educate me: AES cabling
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<blockquote data-quote="Frank Koenig" data-source="post: 138554" data-attributes="member: 416"><p>Re: Educate me: AES cabling</p><p></p><p></p><p></p><p>For a transmission line terminated in its characteristic impedance the capacitance (capacitance per unit length, actually) is irrelevant. Only the characteristic impedance matters.</p><p></p><p>The capacitance matters for lines that do not have matched terminations. In the case of electrically "short" lines (generally less than 1/20 wavelength at the highest operating frequency) the line is accurately modeled as a lumped capacitor that, in combination with the parallel combination of the source and load resistances, forms a first-order low-pass filter. This is the situation we run into with very long mic cables and perhaps is where the confusion comes from.</p><p></p><p>--Frank</p></blockquote><p></p>
[QUOTE="Frank Koenig, post: 138554, member: 416"] Re: Educate me: AES cabling For a transmission line terminated in its characteristic impedance the capacitance (capacitance per unit length, actually) is irrelevant. Only the characteristic impedance matters. The capacitance matters for lines that do not have matched terminations. In the case of electrically "short" lines (generally less than 1/20 wavelength at the highest operating frequency) the line is accurately modeled as a lumped capacitor that, in combination with the parallel combination of the source and load resistances, forms a first-order low-pass filter. This is the situation we run into with very long mic cables and perhaps is where the confusion comes from. --Frank [/QUOTE]
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