816k Console Radio, circa l938 c.l999 catskillki
also for slicing eggs, this very precision bank of aluminum plates is used
to tune the radio. Three sections of the fingers would interleave
to vary the capacitance and hence the frequency of the local oscillator
as well as resonating the input frequency from the antenna.
to a few thousands of an inch tolerance, these cumbersome and trouble prone
mechanical contrivances have been
replaced by solid state varactor diodes, voltage-dependant capacitors,
and phaselocked loops.
Listen to WBCQ, shortwave at 7.415 mHz
, Kennebunk, ME