We found this circuit for 330 MHz using PIC in the magazine Electronics Now of December 1994. The circuit uses components common at the time.
This circuit is used in transceivers, enabling input selection by diode switching through polarity...
This configuration was found in an American publication from the 90s. Operators admit equivalents just...
This circuit was found in an Italian magazine Elettronica Prática of 1977. The transistors can be...