As promised last month, we will continue with a couple of simple easy-to-build circuits we have used from time to time to make some of our amateur radio measurements easier.
First, Figure 1 is an ultra-simple, four-component, untuned field strength meter that will come in handy when making antenna measurements, especially for the newcomer. It is specifically untuned as it can be used over a wide range of frequencies without any adjustment other than a sensitivity control. Although not intentionally calibrated, it is used by locating it somewhere in the vicinity of your antenna and then adjusting your transmitter for maximum output power in the direction you wish (at various frequencies)
