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does mfilter forget opt when we modify io lines ?

Question asked by mlabro on Apr 26, 2004
Latest reply on Apr 27, 2004 by mlabro
I designed a tapped 2200M combline filter with 30° io lines .
Once optimized, I modify 30° into 29° and response shifts.
A new optimization would be necessary.

If, of course without optimization for 29°, I come back to 30°, responses doesn't come back to the original response

Is it possible that when we change io lines length, mfilter forgets previous optimization and computes a new filter ?