Talk:Analog delay line

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coaxial delay lines

The velocity of propagation down an ordinary coaxial cable equals the EM wave velocity down the dielectric. You can find this from the inductance and capacitance per unit length. Coaxial cables are made with helical center conductors, giving them extra inductance, and slowing down the wave. Both the inductance and capacitance are continuous. The same math also applies to the one in the picture, with a wire wound around the outside of a copper pipe. Interestingly, the result is pretty much the ordinary velocity of propagation along the length of the wire. Gah4 (talk) 19:50, 6 March 2019 (UTC)[reply]