Reg Edwards wrote:
So we need something different from and more sophisticated than the
conventional automatic tuner with its relatively simple magnitude and
phase-searching abilities.

If you remembered what frequency the mag loop had been tuned
to last time, would that alleviate the need to know phase?
The reason I ask is that is how I auto-tune my screwdriver
without knowing phase.
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73, Cecil http://www.qsl.net/w5dxp