How to improve this filter.

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From: ASIRENE@v9001.ntu.ac.sg
Date: Tue Mar 08 1994 - 12:43:50 EST


Hi again,

        This isthe filter I am trying to improve. I hope someone out there can
suggest some improvements I can perform to it. Its 4 crystals, 600 Hz BW (6dB),
and I guess the characteristic impedance to be 50 ohms at both ends.

        Here's what my filter looks like right now:-

-----||---o---|[]|---o---|[]|---o---|[]|---o---|[]|---o---||----
  0.1 uF | Y1 | Y2 | Y3 | Y4 | 0.1 uF
         | | | | |
IN> === C1 === C2 === C3 === C4 === C5 >OUT
         | | | | |
         | | | | |
 gnd o---o----------o----------o----------o----------o---o gnd

Y1-Y4 12 MHz crystals
C1,C5 100 pF
C2,C4 560 pF
C5 1000 pF

        Would appreciate any advice, especially to get it to better selectivity
or narrower to about 400 Hz say.

73,
Daniel


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