Re: Full power tuning

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Dr. Resonance by way of Terry Fritz <teslalist-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>


An easier way to do this is an inductive variometer.  Basically a set of two
coils, one within the other, that are rotated slightly to adjust the
coupling.  A small slow speed DC motor can move one coil in either direction
for adjustment.  This system works great for full power tuning.

Look this up in some old turn of the century radio handbooks and you will
see a photograph.  It's easier to visualize once you see it.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
 >
 > I am about to experiment with adding a variable inductor in series with my
 > primary circuit so I can tune for max streamer length while the coil is
 > running.  My external inductor is two small flat spiral coils of 5 turns
 > each (look like miniature primaries) connected in series.  By moving the
 > coils closer together or farther apart, the mutual inductance of the two
 > coils changes, causing the overall inductance of the external coil
assembly
 > to be variable.  (I will move one of them in relation to the other one
with
 > a "linear actuator" made from a cheap electric screwdriver driving a
 > threaded rod.)
 >