I forgot to said to members that the coil show on the PDK, is not glued to the wood table. proving that this picture was taken only to show what Morgan whant´s to show you and not the real PDK. If you put the coil just with masking tape, with time this will start to lose from wood. Also inductance of coil will not be the same, changing frequency and of course stability.
even this picture can tell a lot,and there is nothing more than your circuit with some modifications,oscillator+toroid and a tuned RX coil...
is not enough to understand? there is no magic,its one open book (for those who can read)...
Attachment 18213[/QUOTE]