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Who invented Tuned RF receivers?

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January 16th 05, 01:18 AM

Mike Knudsen

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In article , (Scott Dorsey)
writes:

Wasn't it Nikola Tesla who invented or discovered the basic concepts of
tuned circuits?

Sort of. He noticed resonance effects, but he never figured out how to
apply mathematics to describe them or predict them.

ISTR that Tesla invented the notion of tuning an RF transformer by adding a
third winding and tuning that to resonance, rather than try to tune the very
low-impedance primary (a half dozen turns) or the high-voltage secondary of his
Tesla Coils.

I *suspect* that some Grundig tube radios get their selectivity and sensitivity
out of hardly any stages, by using tertiary resonant windings a la Tesla in
their IF transformers, along with the usual tuning of primary and secondary.
--Mike K.

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