> Has anyone tried to use these couplers in a tank circuit?
> Both coils
> could be tuned by variable capacitors and the coupling
> between the two
> coils would then be optimized for maximum power output.
They are sometimes called variometers.
They have terrible Q at minimum inductance, especially at
higher frequencies. Of all the common methods, this is the
least efficient way to vary inductance over a wide range.
I'd stay away from them unless there is no other option, or
unless the desired inductance adjustment range is very
small!
73 Tom
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