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 is found in a 2011 technical publication from Texas Instruments. It is an amplifier for...
May 2017 - The new high-speed Amphenol FCI Flex connectors with up to 10 Gbps data transmission...
An irregular signal can be converted into a pulse of duration determined by the switching...