[Home][2020 Index] Re: [TCML] Coupling [Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [TCML] Coupling

On 2020-10-17 06:01, mike tucknott via Tesla wrote:
Hi All

With a bipola coil would having 2 movable tap point work for changing
the coupling ?

Say the coil need 5 turns to be in tune, you could built the primary
with 10 turns and you could move the inner and outer taps points in or
out but still keeping the 5 turns needed to keep the coil in tune, the
inner and outer turns passed the tap point would be electrialy dead so
to speak.

Thoughts on this one guys.

Cheers Mike T

I think that changing the coupling by changing the diameter of the primary is the way to go. What you propose would accomplish that effectively. However I think the unused are not dead. They are still coupled and generating potential at the open ends. When you are tapped at the outermost turns for minimum coupling there may be some unexpected "coupling" in the form of D'Arsenval currents. Of course if you could remove the excess turns it would work fine:-)

Perhaps a solenoidal spring wound from beryllium copper or phosphor bronze. Wound tightly would be small diameter with most turns. untwist for large diameter and least turns. Someone else can figure the change in inductance due to change in diameter vs due to change in number of turns:-)

In any case your idea of changing the diameter, that is the ticket.
Tesla mailing list