This converter has coils according to the reception and converted frequency bands. We found it in the October 1989 Radio Electronics magazine in an article that teaches its construction.
The circuit shown is from a 1993 documentation. It uses two FETs in an oscillating configuration that...
This output step with a transistor can be used in experimental radios and intercoms or as a signal...
This circuit, for bands above 15 MHz, was found in an Argentine publication from the 1970s. The L1...