[Lowfer] remote auto tuning

[Eric Smith]

For you design engineers out there (Lyle? :) --

Several weeks ago (when first getting interested in LF), I read about 
WWVB.  That antenna is tuned automagically.  From their web page:

----
A computer is used to automatically tune the antennas during icy and/or 
windy conditions. This automatic tuning provides a dynamic match between 
the transmitter and the antenna system. The
                    computer looks for a phase difference between voltage 
and current at the transmitter. If one is detected, an error signal is 
sent to a 3-phase motor in the helix house that rotates the rotor inside
                    the variometer. This retunes the antenna and restores 
the match between the antenna and transmitter.
----

How tough would it be to design a circuit to do this?  I think this is 
pretty cool.  You guys already have means for remote tuning...what about 
automation?

Ok, it may be more trouble than it is worth.  But how hard would it be 
to do?  Would the resulting circuit be very compicated, or could it be 
done with just a few components?

And I'm talking about a circuit that could drive a SMALL motor for 
LowFER-type use, not the 3-phase motor driving the variometer at WWVB!

What do you think?  Food for thought?

Eric, KD5UWL