In Peter Dodd's book LF experiments page 55 a drawing is shown of a
coil arrangment. The the coil inductance is adjusted by shorting turns on
the coil. Is this right?
Yes. If you look at the coil design by Dick, PA0SE on the front cover of
LFEH he uses taps every 10 turns at one end of the coil and a tap every
single turn at the other thereby having an incremental one tap per turn for
over the whole coil length. See the description of an earlier version on
page 62. Dick shorts out the unused turns.
Another method is to use the G3YMC coupled bucket variable coil. (I like
this idea of Dave's). I have used this method using coupled bins on 73kHz.
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