Dedicated to micro-power transmitter field intensity meter

This circuit is a simple field strength meter, which is very sensitive to micro-power signals. Since this circuit only compares relative field strength, there is no standard, but it can make debugging a breeze! You can directly point the probe to the output of the modulator, or even point the probe to the output of the excitation stage. Among them, K1 is the gain selection, K2 is the power switch, and W1 is the sensitivity adjustment. After the circuit is completed, it is placed in the iron box, and the ground terminal as shown in the figure is connected to the iron box.