In a perfect piece of theoretical coax this impedance figure will be the same no matter what the RF frequency or voltage is it is dependent on the physical properties of the coax itself, the dimensions of the conductors and the dielectric properties of its non-conducting components. If you were to non-invasively measure the RF voltage and current, you could then calculate an impedance in ohms in a similar way as you might a resistance in a DC circuit. So, imagine an infinitely long piece of coax with RF flowing though it. And for that we need to talk briefly about characteristic impedance without descending too far into the mathematical proofs that detain first-year electronic engineering students. Form Follows Functionīefore looking at individual connectors it’s worth looking at the much broader picture, of what an RF connector does and why it is designed in a particular way. This article will look at some of the different types of connector and try to explain some of those choices. You might imagine that the most important would be the physical and electrical specification of the connector itself, but other factors such as company design policy, the accepted norm of a particular field, and the personal preferences of the designer come into play. There are a huge variety of factors that lie behind the choice of RF connector on a piece of equipment. Don’t worry, your secret is safe with me. In making all these disparate devices talk to each other you probably have a guilty past: at some time you will have created an unholy monster of a coax interface by tying several adaptors together to achieve your desired combination of input and output connector. You’ll need them, because the chances are your bench will feature instruments, devices, and modules with a bewildering variety of connectors. If you do any work with analogue signals at frequencies above the most basic audio, it’s probable that somewhere you’ll have a box of coax adaptors. Just a selection from the author’s unholy assortment of adaptors.
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