04-12-2013, 09:46 AM
I would think that something closer to 100-200pF would be closer. Though the DC resistance (and therefor the nominal inductance) of the primary is only about 10% of that of the secondary, it also has the slug tuning, which raises the inductance and sharpens the "Q". These are interesting IF's, can't say I've ever seen combination variable inductance AND variable capacitance in one can before.