B
BillC
Guest
I am now working on the coil unit of the RF preselector, it is very fiddly to work on . Taking hours . The images show the general layout . The low band has fixed inductance in series with the tuning inductance, when switching to the mid band that fixed inductance is shorted to ground which also places the bottom end of the tuning inductance to ground thus allowing the mid band to tune over its' range.