It actually consists of a tunable field strength meter. The circuit is of an old documentation and the circuit must be tuned to the frequency to be monitored. The circuit offers the option to use a headset.
This circuit was obtained from the November 1989 issue of Radio Electronics magazine. The circuit is...
This circuit was found in Texas Instruments documentation from the 1980s. The circuit has a Q less...
This high sensitivity receiver of 30 nW was found in documentation from the 1980s. Integrated...