With network-analyser you can measure only up to 6 GHz. For higher frequencies you have to use generator and power-meter. This article describes how does the author measure such relays available from various manufacturer such as Narda
Remote control by whistling. Turn appliances off and on.
This circuit demands a control current that is 100 times smaller than that needed by a typical optically isolated solid state relays. It is ideal for battery-powered systems. Using a combination of a high current TRIAC and a very sensitive low current SCR
It has both a source and sink output that change state whenever a metal button connected to the circuit is touched. An earth ground reference is required.
uses a single IC to convert a noisy pushbutton switch signal into a clean pulse or a sustained push on-push off signal.
controls 4 relays from PC parallel port