Wow! I have received a lot of responses and there are some very
interesting and valuable ideas in them.
Wayne's response to the list gets the prize for smoke, mirrors, and just
plain fun (how much of that is smoke we will never know). His message set a
new high for the ratio of reading enjoyment to actual usefulness.
Thanks guys.
p.s. For those who have asked .... the tuner is a dual L-C network fed
through an SWR bridge and 1:1 voltage balun and I am using it 160-20M to
feed a 160M horizontal loop using ladder line. There is a description of
the tuner at http:/www.qsl.net/k7fj/ .
Don K7FJ
I bet Wayne knows a good algorithm!
Indeed I do. And it took several weeks of serious R & D and coding the
first time we developed an ATU (KAT2).
Among other things, the code uses four tuning phases, each with different
granularities; time-based SWR target adjustment; hand-tuned,
pseudo-grayscale switching of latching relays; SWR-based look-ahead tree
pruning (borrowing extensively from game theory); scaled L-C stepping near
local minima; and, when possible, L-C range prediction based on band
information.
It was a wonderful, hair-pulling, sleep-depriving, learning experience
that I wouldn't deny anyone by giving away the details ;)
73,
Wayne
N6KR
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