Therefore this circuit works as a product detector. The audio beat signal between the 5MHz oscillator and the IF signal is heard. In this case the diagram is the same as upside. But only IF frequency was changed for 2MHz. Convertor of this radio is the same circuit from the convertor of normal 6 transistor AM radio.
Filter is also the poor mans filter.
Crystal between collector and gate oscillates 2000.6 KHz beat. Therefore this circuit acts as a product detector while a IF signal came from the base. I could hear the domestic SSB and CW QSO of 7MHz with the dipole antenna in my house. I think these circuits are the best for the new homebrewer.