One of the most abundant and least expensive in the coaxial switches are mechanical, operated by hand using a knob. The most simple one may be the A/B switch, with one particular input and two outputs, A and B. The biasing of a PIN diode entails applying a DC voltage https://low-noiseamplifier70170.blogdigy.com/the-2-minute-rule-for-pin-diode-switch-52265708