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Quoting Chris Wilson <chris@chriswilson.tv>:
15/12/2020 23:23
Many Henry RF generators on 27 or 14 MHz use a brass (?) slug within
a copper tube coil for inductance changing (as the turns counter
advances the slug within the coil the inductance reduces) and a
rather Heath Robinson variable capacitor using two brass plates,
with a Teflon insulation sheet between them. Now I realize they were
not intended to be frequency agile, so my question is, is there an
advantage to changing the strange looking variable cap for a vacuum
variable? Is the consensus of opinion that slug tuning the inductor
is fine and can be left as is? Thanks.
An example Henry RF deck is at http://www.chriswilson.tv/deck.jpg
--
Best Regards,
Chris Wilson.
mailto: chris@chriswilson.tv
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