The circuit is from 80s Siliconix documentation. The integrated circuit is from the company and is not common today. It can be used operational equivalent more common in our times.
This common gate circuit for the 13 to 30 MHz band was found in old English documentation....
This circuit was originally found in a Philips documentation from 1969. It is intended for sensing...
This FET voltmeter is from an old 1974 amateur radio publication. The circuit can use MPF102 or...