Found in a 1969 documentation, this circuit for the 20 MHz band does not use a transformer. The circuit is a phase detector that makes use of the transistor of the time.
Pressing S1 the LED glows by a time interval depending on the capacitor. Time intervals in the...
This overtone oscillator can generate signals up to 150 MHz. The crystal determines the frequency and...
Found in a 90's EDN, this circuit generates signals in the frequency range given by the graph. The...