This is a relative issue, though: look, if the coax is >4000km in length then, even a 50Hz signal changes in time but also in space. We can also say that the short pulse changes in time and in space but the 50Hz one changes in time only. Thus, for instance, a coax is just a wire for a 50Hz signal, but a transmission line for a nanosecond-duration pulse. They can be simply seen as a piece of wire or as a transmission line, all ultimately depending on the frequency of the signals flowing thru them.Īlthough high, the propagation speed of electric signals if finite, and in a coax with PFTE dielectric it is ~69% of speed of light. They can virtually be found on every instrumentation table in labs and yet we pretty much overlook their function. Coaxial cables are an interesting piece of the signal measurement paraphernalia.
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