Bill,
It's worse than that. Even with my reed relays (very fast compared to
conventional relays) I have to allow 10 mS for them to settle and the A/D
requires a millisecond or so to read the forward and reflected power.
A reiterative multilevel slope-sensing algorithm using decreasing
granularity* is the answer. I have been slowely creeping up on a
satisfactory solution and, depending on distractions, hope to have a fairly
fast autotuner in a week or so. Suggestions from the list have been very
helpful.
* my term ... don't try to look it up! ;)
Don K7FJ
On Sep 15, 2005, at 11:22 AM, Craig Rairdin wrote:
In this particular case, if you were to iterate over all possible
combinations of L and C it's only necessary to store the best result so
far
and compare the current result to the best result. If the current result
is
better, it becomes the new best. Now you have no sorting at all and your
time is order N instead of order N^2.
The problem with the exhaustive search is there are 2^17 = 131,072
combinations to try. (256 cap and inductor values, plus reversing the
whole L network)
It takes a few ms for each relay to physically switch. If you can try 100
combinations a second (10 ms), that's still about 20 minutes to try them
all. Even with 1 ms switching time, you're still looking at 2 minutes to
find a match.
A tough problem.
Bill Coleman, AA4LR, PP-ASEL Mail: [EMAIL PROTECTED]
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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