MFJ 9030 Filter Mod

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A short question for anyone familiar with ladder filters. Is it feasable
to modify the MFJ 9030's four pole filter to narrow the bandpass?
Handbook says bandwidth does down when shunt caps are increased in value
and terminating Z is lowered. So I'm considering cap replacement, but
don't want to waste parts and time if it will not work...

Are there any windows, dos, or os/2 programs for designing ladder
filters?
------------------------------------
73,
Philip Collier KG2DH

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