Depending on the components, given in the table, this circuit can amplify signals of 100 MHz or 400 MHz. The circuit is from a 80's documentation. Equivalent transistor can be used.
This configuration from a 1976 technical documentation shows how to use a varicap in a direct...
This circuit was found in the October 1979 issue of Radio Electronics magazine. The circuit is...
When this alarm is off current drained is very low, only about 60 µA. The circuit can be powered...