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.
Found in RCA documentation from the 1970s, this circuit uses currently unusual integrated...
This circuit was found in a 90s Popular Electronics. The circuit operates in the range determined...
The arranjment sohon Bellow, and simulated in the Multisim Blue allows to see in the oscloscope...